WenmarOpen by Wenmar Pro

Service bulletins for the 2021 Chevrolet Silverado

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1747 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Bulletins, newest first
PIP5655E2021-04-19. Service bulletin. STRUCTURE. This Preliminary information communicates to the dealer technician that the 10L1000 transmission and valve body assembly part restriction has ended. Dealers are advised that these transmissions and valve bodies can now be ordered through the regular GM CCA parts process or PQC process for required dealers (Canada).
PIP5776B2021-04-19. Service bulletin. STRUCTURE. This Preliminary information communicates that a vehicle may exhibit a misfire condition resulting in misfire codes P0300-P308. Upon diagnosis it may be discovered the lifter has come apart. It is recommended to replace the lifter guide and the four lifters.
PIP57842021-04-19. Service bulletin. STRUCTURE. This Preliminary information communicates to the dealer technician to inspect for a missing 1-2-7-8-R clutch fluid passage seal or incorrect 1-2-7-8-R clutch fluid passage seal being install for a no movement concern after valve body replacement on the 8L45 or 8L90 transmissions.
PIP5771B2021-04-19. Service bulletin. POWER TRAIN; STRUCTURE. This Preliminary information communicates to the dealer technician to replace the valve body on 8 speed transmissions setting DTC P0796 if no debris is found in the transmission fluid pan. If debris is found in the transmission fluid pan the technician is advised to repair the transmission as needed and replace the valve body.
PIP57832021-04-19. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary information communicates to dealer technicians that DTC P026C are under investigation by GM Engineerinig.
N2023262102021-03-22. Service bulletin. WHEELS. Customer Satisfaction Program - Certain 2021 model year Chevrolet Silverado 1500 vehicles, equipped with 20" Painted Aluminum Wheels (RPO RD4) may have been double charged for the wheels at the time of vehicle purchase. Dealers will provide customers with a reimbursement check. Customers with vehicles equipped with the 1LT option package will receive a check for $1100.00 Customers with vehicles equipped with the 1SP option package will receive a check for $800.00.
PIE06102021-03-08. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Loss of Power, Instrument Panel Cluster (IPC) Gauges are Inoperative and/or Fluctuate, Multiple Warning Lights on DIC.
PIE06092021-03-08. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM; EQUIPMENT; ENGINE AND ENGINE COOLING. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a noise heard from the engine compartment, loss of charging and/or reduced alternator output.
PIE06022021-03-08. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Service Engine Soon Lamp Illuminated On Driver Information Center (DIC), DTC P208B Set.
PIE0593A2021-03-08. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; EQUIPMENT; SERVICE BRAKES. This engineering informational bulletin 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).
PIE0590A2021-03-08. Service bulletin. ENGINE; EQUIPMENT; ELECTRICAL SYSTEM:INTERIOR LAMPS/BULBS. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards check to the engine lamp being illuminated on the drivers information center (DIC).
150089004C2021-03-08. Service bulletin. SUSPENSION:FRONT:MACPHERSON STRUT; SUSPENSION:FRONT:SHOCK ABSORBER; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
21NA0262021-03-08. Service bulletin. EQUIPMENT; STRUCTURE; EQUIPMENT ADAPTIVE/MOBILITY. This service bulletin provides information for dealers/technicians on accessory all-weather floor liners and flat mats warped or misshapen.
21NA0122021-03-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. This technical bulletin provides repair information to correct a customer concern of Clean Exhaust Filter, Perform Manual Regen, and Loss of Digital Speedometer DIC Displays.
21NA0072021-03-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. This technical bulletin provides a procedure to program the reductant fluid module if found the cause of the customers concern.
21NA0062021-03-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. This bulletin provides a possible location of a bad connection at the reductant fluid tanks electrical connector.
21NA0022021-03-01. Service bulletin. EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, DIESEL. This informational bulletin provides a test procedure, for a possible faulty DEF Heater.
20NA2032021-03-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin explains how the regen works for the DEF system and how it works at different levels.
20NA1102021-03-01. Service bulletin. FUEL SYSTEM, DIESEL; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. 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.
20NA1052021-03-01. Service bulletin. ELECTRICAL SYSTEM:ADAS:HUD:CAMERA/SENSOR; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; BACK OVER PREVENTION. This technical bulletin provides repair information to correct a customer concern of 360 Camera Views go Blank with Tailgate Removed.
20NA0202021-03-01. Service bulletin. SERVICE BRAKES. This technical bulleti provides a procedure to replace the front and rear brake pads if the brakes are squealing.
18NA2852021-03-01. Service bulletin. EQUIPMENT; FUEL SYSTEM, OTHER:KINETIC:CLUTCH. This informational bulletin advises the tech of a possible normal condition when the vehicle creeps forward during start up conditions when the clutch packs are full of residual oil.
18NA0732021-03-01. Service bulletin. ENGINE. This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.
PIE06042021-03-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 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).
PIE0601A2021-03-01. Service bulletin. ENGINE; ELECTRICAL SYSTEM. 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 Engine Soon Lamp being illuminated.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.