The manufacturer’s record · Page 11 of 11
Original record summaries, dates and identifiers for this model-year. Records 1,001–1,071 of 1,071, ordered newest first. Dated records on this page: Apr 7, 2020–Dec 8, 2020.
Back to 2021 Chevrolet SILVERADO 2500 problems & recallsThis archive includes service bulletins, warranty notices, software instructions and other communications. Records may repeat or supersede earlier instructions. A model-year association is not proof that a document covers every engine, trim, VIN or reported symptom, or that a repair is free.
NHTSA download snapshot: Sep 28, 2026. These are communication associations for this vehicle, not unique defects. How records are joined and counted.
NHTSA communication ID: 10186112
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering information (EI) is requesting information from technicians to provided the engineers listed in regards to No Trailer Lights, No Brake Lights and/or Trailer Tow Receptacle is Loose.
Source components: ELECTRICAL SYSTEM · EQUIPMENT · TRAILER HITCHES.
Source record 10186112 at NHTSANHTSA communication ID: 10186106
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
Source components: ENGINE AND ENGINE COOLING · EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY.
Source record 10186106 at NHTSANHTSA communication ID: 10187740
NHTSA source summary · Original PDF not reviewed by Recallfolio
GSA Example: This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the service 4WD message illuminated on the drivers information center (DIC).
Source components: ELECTRICAL SYSTEM · EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL.
Source record 10187740 at NHTSANHTSA communication ID: 10186119
NHTSA source summary · Original PDF not reviewed by Recallfolio
GSA Example: This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the service 4WD message illuminated on the drivers information center (DIC).
Source components: ELECTRICAL SYSTEM.
Source record 10186119 at NHTSANHTSA communication ID: 10187394
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
Source components: TIRES.
Source record 10187394 at NHTSANHTSA communication ID: 10186080
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
Source components: TIRES.
Source record 10186080 at NHTSANHTSA communication ID: 10187415
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides repair information to correct a customer concern of Rear Camera Inoperable.
Source components: BACK OVER PREVENTION.
Source record 10187415 at NHTSANHTSA communication ID: 10186088
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides repair information to correct a customer concern of Rear Camera Inoperable.
Source components: BACK OVER PREVENTION · ELECTRICAL SYSTEM.
Source record 10186088 at NHTSANHTSA communication ID: 10187626
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on Warranty Administration ? Required Operating Procedures - 8 Points (U.S. Only).
Source components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL.
Source record 10187626 at NHTSANHTSA communication ID: 10187383
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.
Source components: ENGINE AND ENGINE COOLING.
Source record 10187383 at NHTSANHTSA communication ID: 10187372
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
Source components: POWER TRAIN.
Source record 10187372 at NHTSANHTSA communication ID: 10186105
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on Warranty Administration ? Required Operating Procedures - 8 Points (U.S. Only).
Source components: EQUIPMENT.
Source record 10186105 at NHTSANHTSA communication ID: 10186069
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.
Source components: EQUIPMENT · PARKING BRAKE · POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE).
Source record 10186069 at NHTSANHTSA communication ID: 10186058
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
Source components: ELECTRICAL SYSTEM:SOFTWARE · POWER TRAIN.
Source record 10186058 at NHTSANHTSA communication ID: 10184518
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the airbag lamp illuminated on the driver?s information center (DIC).
Source components: AIR BAGS.
Source record 10184518 at NHTSANHTSA communication ID: 10184480
NHTSA source summary · Original PDF not reviewed by Recallfolio
This warranty administration bulletin provide policy information for variable diagnostic time allowances on select labor operations (U.S. Only).
Source components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL.
Source record 10184480 at NHTSANHTSA communication ID: 10184484
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides a procedure to replace the 4 5 6 clutch housing if the bushing was found worn and the cause of the customers concern.
Source components: EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY · POWER TRAIN:CLUTCH ASSEMBLY.
Source record 10184484 at NHTSANHTSA communication ID: 10184501
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
Source components: ENGINE · POWER TRAIN:AUTOMATIC TRANSMISSION.
Source record 10184501 at NHTSANHTSA communication ID: 10184517
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the airbag lamp illuminated on the driver?s information center (DIC).
Source components: AIR BAGS.
Source record 10184517 at NHTSANHTSA communication ID: 10184485
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides a way for the technician to identify if the ECM has been modified.
Source components: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM).
Source record 10184485 at NHTSANHTSA communication ID: 10184120
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ENGINE.
Source record 10184120 at NHTSANHTSA communication ID: 10184500
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Informational Bulletin provides information on availability of Diesel Fuel additives.
Source components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL · FUEL SYSTEM, DIESEL.
Source record 10184500 at NHTSANHTSA communication ID: 10184492
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides a procedure to inspect and repair the fuel pressure sensor if found the cause of the customers concern.
Source components: EQUIPMENT · FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL.
Source record 10184492 at NHTSANHTSA communication ID: 10184499
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides information on Chemical Staining, Pitting, Corrosion and/or Spotted Appearance of Chromed Aluminum Wheels.
Source components: EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY · WHEELS.
Source record 10184499 at NHTSANHTSA communication ID: 10184105
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. Technician should not use the information that is provided by the antilock braking system tire size selection.
Source components: TIRES · WHEELS.
Source record 10184105 at NHTSANHTSA communication ID: 10184504
NHTSA source summary · Original PDF not reviewed by Recallfolio
This PI provides information on Rear and Side Tempered Glass Spots (Quench Marks) and that they are a normal characteristic.
Source components: VISIBILITY:GLASS, SIDE/REAR · VISIBILITY:GLASS, SIDE/REAR:CRITICAL FASTENERS.
Source record 10184504 at NHTSANHTSA communication ID: 10184503
NHTSA source summary · Original PDF not reviewed by Recallfolio
Thins informational bulletin provides information on Paint-less Dent Repair Process.
Source components: EQUIPMENT · STRUCTURE.
Source record 10184503 at NHTSANHTSA communication ID: 10184479
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information for the technicians on where to look on the Duramax engine for coolant leaks.
Source components: ENGINE AND ENGINE COOLING · EQUIPMENT.
Source record 10184479 at NHTSANHTSA communication ID: 10184514
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards an intermittent no start.
Source components: ELECTRICAL SYSTEM:STARTER ASSEMBLY · EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY.
Source record 10184514 at NHTSANHTSA communication ID: 10184502
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on Clean Exhaust Filter See Owners Manual Now or Cleaning Exhaust Filter Keep Driving Until Message is Cleared messages Displayed on DIC, DTC P2463 May Be Set.
Source components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM · EQUIPMENT.
Source record 10184502 at NHTSANHTSA communication ID: 10183801
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the ABS or the traction control message illuminated in the Drivers Information Center (DIC).
Source components: SERVICE BRAKES.
Source record 10183801 at NHTSANHTSA communication ID: 10183127
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on Diesel Exhaust Fluid (DEF) and the proper use of the DEF system.
Source components: EQUIPMENT · FUEL SYSTEM, DIESEL.
Source record 10183127 at NHTSANHTSA communication ID: 10182584
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates to the dealer technicians a warm engine knock noise has no short or long term effects on the engine. Do not attempt repairs for this noise.
Source components: ELECTRICAL SYSTEM · ENGINE.
Source record 10182584 at NHTSANHTSA communication ID: 10183171
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides additional information on how to graph a cylinder misfire and a possible diagnostic cause.
Source components: ENGINE · EQUIPMENT · POWER TRAIN.
Source record 10183171 at NHTSANHTSA communication ID: 10183132
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
Source components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE · EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY.
Source record 10183132 at NHTSANHTSA communication ID: 10183198
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides information and a service procedure for dealers/technicians on OnStar Over the Air Update for TTY / TDD Operation and Continuous Improvement Changes.
Source components: ELECTRICAL SYSTEM.
Source record 10183198 at NHTSANHTSA communication ID: 10183181
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin advises the technician to not replace the TMAP sensor, clean it using air or harsh chemicals but allow time for the sensor to thaw.
Source components: ELECTRICAL SYSTEM · EQUIPMENT.
Source record 10183181 at NHTSANHTSA communication ID: 10183176
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin explains how to identify possible DEF contamination.
Source components: EQUIPMENT · FUEL SYSTEM, DIESEL.
Source record 10183176 at NHTSANHTSA communication ID: 10183151
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin explains how to check the NOx Catalyst Reductant-Load Adaptive Values using GSD2.
Source components: ENGINE · EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY.
Source record 10183151 at NHTSANHTSA communication ID: 10183799
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards an intermittent no start.
Source components: ELECTRICAL SYSTEM.
Source record 10183799 at NHTSANHTSA communication ID: 10183798
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the trailer brake being inoperative and/or check trailer brakes message on drivers information center (DIC).
Source components: TRAILER HITCHES.
Source record 10183798 at NHTSANHTSA communication ID: 10183782
NHTSA source summary · Original PDF not reviewed by Recallfolio
The intent of this technical bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
Source components: ELECTRICAL SYSTEM · EQUIPMENT · POWER TRAIN:AUTOMATIC TRANSMISSION.
Source record 10183782 at NHTSANHTSA communication ID: 10183153
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides information to correct a customer concern of an in-tank fuel pump whining noise, engine hard to start and/or stalls and Malfunction Indicator Lamp (MIL) is illuminated.
Source components: ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP · FUEL SYSTEM, GASOLINE.
Source record 10183153 at NHTSANHTSA communication ID: 10183130
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on common diesel engine tick noises and how they are considered part of normal operation and no parts should be replaced for these normal operating conditions.
Source components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL · EQUIPMENT · FUEL SYSTEM, DIESEL.
Source record 10183130 at NHTSANHTSA communication ID: 10183126
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on Engine Concerns that could result from lack of scheduled maintenance, improper service or aftermarket calibrations.
Source components: ENGINE.
Source record 10183126 at NHTSANHTSA communication ID: 10183131
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on higher than expected oil consumption.
Source components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL · FUEL SYSTEM, DIESEL.
Source record 10183131 at NHTSANHTSA communication ID: 10183779
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL.
Source components: FUEL SYSTEM, DIESEL.
Source record 10183779 at NHTSANHTSA communication ID: 10183162
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.
Source components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL · FUEL SYSTEM, DIESEL.
Source record 10183162 at NHTSANHTSA communication ID: 10183155
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
Source components: ENGINE AND ENGINE COOLING · FUEL SYSTEM, OTHER.
Source record 10183155 at NHTSANHTSA communication ID: 10183191
NHTSA source summary · Original PDF not reviewed by Recallfolio
This service bulletin provides information for dealers/technicians on Normal Characteristic - Wireless Phone Projection Audio Cuts Out Every 10 Seconds on New/Unsold Vehicles.
Source components: EQUIPMENT:ELECTRICAL.
Source record 10183191 at NHTSANHTSA communication ID: 10183168
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin advises the technician on what to do if the DEF pump has been replaced and perform a leak test to prime the pump.
Source components: FUEL SYSTEM, DIESEL · FUEL SYSTEM, DIESEL:DELIVERY:FUEL PUMP.
Source record 10183168 at NHTSANHTSA communication ID: 10183780
NHTSA source summary · Original PDF not reviewed by Recallfolio
This warranty administration bulletin provides information on Warranty Administration - Customer Concern Not Duplicated (CCND) Labor Operation Numbers.
Source components: EQUIPMENT.
Source record 10183780 at NHTSANHTSA communication ID: 10182535
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ENGINE AND ENGINE COOLING.
Source record 10182535 at NHTSANHTSA communication ID: 10181724
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
Source components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL.
Source record 10181724 at NHTSANHTSA communication ID: 10181180
NHTSA source summary · Original PDF not reviewed by Recallfolio
PIP5753 created to advise the technician to inspect for loose bolts on the turbocharger if there is a performance issue and code set.
Source components: PARKING BRAKE · WHEELS.
Source record 10181180 at NHTSANHTSA communication ID: 10181675
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA) (US dealers only).
Source components: EQUIPMENT · STRUCTURE:BODY.
Source record 10181675 at NHTSANHTSA communication ID: 10181729
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to inspect for engine oil leak and contact the engineer listed.
Source components: ENGINE · FUEL SYSTEM, OTHER.
Source record 10181729 at NHTSANHTSA communication ID: 10181158
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ENGINE AND ENGINE COOLING.
Source record 10181158 at NHTSANHTSA communication ID: 10181732
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering information (EI) is requesting information from technicians to provided the engineers listed in regards to No Trailer Lights, No Brake Lights and/or Trailer Tow Receptacle is Loose.
Source components: EQUIPMENT · EQUIPMENT ADAPTIVE/MOBILITY · EXTERIOR LIGHTING.
Source record 10181732 at NHTSANHTSA communication ID: 10181148
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates the need for proper documentation when submitting a Field Product Report on paint issues with the new HD Silverado and Sierra.
Source components: STRUCTURE.
Source record 10181148 at NHTSANHTSA communication ID: 10181695
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
Source components: ELECTRICAL SYSTEM · EQUIPMENT.
Source record 10181695 at NHTSANHTSA communication ID: 10181660
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
Source components: POWER TRAIN.
Source record 10181660 at NHTSANHTSA communication ID: 10179658
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ENGINE.
Source record 10179658 at NHTSANHTSA communication ID: 10180317
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
Source components: TIRES.
Source record 10180317 at NHTSANHTSA communication ID: 10180315
NHTSA source summary · Original PDF not reviewed by Recallfolio
This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
Source components: ELECTRICAL SYSTEM.
Source record 10180315 at NHTSANHTSA communication ID: 10180293
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed.
Source components: POWER TRAIN:AUTOMATIC TRANSMISSION.
Source record 10180293 at NHTSANHTSA communication ID: 10179625
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ENGINE · EQUIPMENT.
Source record 10179625 at NHTSANHTSA communication ID: 10178394
NHTSA source summary · Original PDF not reviewed by Recallfolio
This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
Source components: ELECTRICAL SYSTEM.
Source record 10178394 at NHTSANHTSA communication ID: 10179536
NHTSA source summary · Original PDF not reviewed by Recallfolio
This engineering informational bulletin is requesting information from technicians to inspect for engine oil leak and contact the engineer listed.
Source components: ENGINE · ENGINE AND ENGINE COOLING.
Source record 10179536 at NHTSANHTSA communication ID: 10175854
NHTSA source summary · Original PDF not reviewed by Recallfolio
This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before sold (prepping) to the customer.
Source components: EQUIPMENT ADAPTIVE/MOBILITY · EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL.
Source record 10175854 at NHTSANHTSA communication ID: 10175762
NHTSA source summary · Original PDF not reviewed by Recallfolio
This technical bulletin provides a procedure to check the oil level for correct reading and oil pressure switch is in working order.
Source components: ELECTRICAL SYSTEM · ENGINE.
Source record 10175762 at NHTSA