2021 Chevrolet Tahoe Technical Service Bulletins

1,477 technical service bulletins (TSBs) are on record for the 2021 Chevrolet Tahoe. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10230703Dec 20, 2022Transmission and drivetrain. This Preliminary information communicates that improper installation of the valve body may cause an unawanted Service Transmission message with no DTC'S.
• 10228909Dec 20, 2022Transmission and drivetrain. This informational bulletin advises the tech to check if the trans cooler lines are twisted which may cause the customers concern.
• 10230697Dec 15, 2022Visibility (wipers, defrost, mirrors). This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related components. That any of the listed DTC's may set with or without poor engine performance.
• 10230695Dec 14, 2022Equipment. This Preliminary information communicates information on how dealers can contact the supplier for Associated Accessories offered through GM.
• 10228888Dec 14, 2022Engine cooling. This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
• 10228886Dec 14, 2022Engine cooling. 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.
• 10228863Dec 13, 2022Engine cooling, Transmission and drivetrain. This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
• 10230691Dec 12, 2022Forward collision avoidance. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert".
• 10230690Dec 12, 2022Transmission and drivetrain, Electrical system. This Preliminary information communicates and issues with Fuse F49 blowing causing a SES MIL and a Service Theft Deterrent System message displayed in the DIC. It instructions dealership to inspect the 12 volt power accessory port for shorting out.
• 10227798Dec 8, 2022Engine cooling, Electrical system. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing.
• 10228192Dec 7, 2022Equipment. This service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
• 10228226Dec 6, 2022Brakes. This service bulletin provides information to dealership personnel that after performing a brake inspection, brake pad replacement, or any other repair that requires the caliper piston to be reseated may be causing DTC C05B0 to falsely set for eBoost applications.
• 10230683Dec 5, 2022Equipment, Electrical system. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
• 10230682Dec 2, 2022Equipment, Electrical system. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
• 10227401Nov 30, 2022Equipment, Electrical system. This service bulletin provides diagnostic/repair information to correct a customer concern of Cellphone not Charging or USB Receptacle Inoperative.
• 10227676Nov 29, 2022Equipment. This Preliminary information communicates an issues with the odometer being incorrect after a programming event and how the dealership can resolve the issue.
• 10227674Nov 29, 2022Wheels, Tires. 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.
• 10227671Nov 21, 2022Electrical system. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
• 10227380Nov 21, 2022Electrical system, Latches, locks and linkages. This service bulletin provides repair information to correct a customer concern of DTC B1038 SYM64 set in the BCM and Door Ajar Message on Driver Information Center (DIC).
• 10227288Nov 18, 2022Transmission and drivetrain. This informational bulletin advises the technician of a possibly noise coming from the transmission oil pump.
• 10227261Nov 18, 2022Engine cooling. This bulletin advises the technician to Inspect the position of the head gasket locating tabs to determine if the head gasket(s) has been possibly installed backwards to correct a concern of an Engine Thermostat Tick Noise and/or Running Hot.
• 10227241Nov 18, 2022Transmission and drivetrain, Engine cooling. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
• 10227229Nov 18, 2022Transmission and drivetrain. 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.
• 10227667Nov 17, 2022Equipment. This Preliminary information communicates an issue with the 2nd row bucket seat having side to side movement. GM engineering is working on a fix.
• 10227265Nov 17, 2022Suspension, Electrical system. This technical bulletin provides a procedure to remove the conduit from the harness for the accelerometer to correct the condition of Message “Service Suspension System” Displayed and/or DTC C102Exx.
• 10227259Nov 15, 2022Engine cooling. This bulletin provides diagnostic information when checking the exhaust system for leaks.
• 10227664Nov 14, 2022Steering, Lane departure. This Preliminary Information communication provides information to the technician with additional information on the functionality of Lane Keep Assist. Starting with 2016 model year Lane Keep Assist Regular Production Option Code (UHX) replaced Lane Departure Warning Regular Production Option Code (UFL). Lane Keep Assist is designed to assist the driver in keeping the vehicle from drifting out of a driving lane…
• 10227275Nov 14, 2022Body and structure, Equipment. This technical bulletin provides repair information to correct a customer concern of the Rear Washer System Inoperative, or Boot to Washer Hose Disconnection and Possible Hose Leaking.
• 10227662Nov 10, 2022Back-over prevention (rear camera), Electrical system. This Preliminary information communicates an issue with the GDS2 scan tool not being able to communication with the front view camera module and provides a work around until GDS2 is fixed.
• 10227058Nov 9, 2022Transmission and drivetrain. This information advises the technician the difference between a welch cap leak and the output seal of the t-case or transmission leaking ATF causing the customers concern.
• 10227056Nov 9, 2022Engine cooling. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
• 10227054Nov 9, 2022Engine cooling. This bulletin advises the technician of a possible coolant hose that might be kinked causing the customers concern.
• 10227052Nov 7, 2022Body and structure. This preliminary informational bulletin provides frame coating repair information to correct a customer concern of wax coating on frame peeling, metal shows corrosion/rusting (U.S. and Canada Only).
• 10227041Nov 7, 2022Engine cooling, Fuel system. 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.
• 10226118Nov 4, 2022Electrical system, Equipment. This service bulletin provides repair information on release of Radio Software Version V160 Update to correct customer concerns of radio software issues.
• 10226120Nov 3, 2022Suspension, Electrical system. This technical bulletin provides a procedure to remove the conduit from the harness for the accelerometer to correct the condition of Message “Service Suspension System” Displayed and/or DTC C102Exx.
• 10227654Nov 1, 2022Electrical system. This Preliminary information communicates an issues with the odometer being incorrect after a programming event and how the dealership can resolve the issue.
• 10225749Oct 31, 2022Engine cooling. This informational bulletin advises the technician on normal noises produced by the engine and to explain this to the customer.
• 10225732Oct 28, 2022Brakes, Wheels. This bulletin provides a procedure to clean the back side of the rims and rotors and to correct the customers concern of wheel clicking.
• 10226395Oct 26, 2022Electronic stability control, Suspension, Brakes. This Preliminary information communicates an issue with the air leveling suspension losing air pressure in very cold temperatures while sitting for several hours. Dealers are to replace both the front air springs.
• 10225711Oct 25, 2022Engine cooling, Electrical system. This service bulletin provides a procedure to repair a customer concern of Stop/Start System Inhibited / IBS / Battery Monitor with Module Malfunction Indicator Light (MIL) Illuminated - DTC U152D, P15FF, P305D, P305E, U01B0 Set.
• 10225664Oct 21, 2022Equipment, Electrical system. This technical bulletin provides repair information to correct a customer concern of Articulating Running Board Inoperable.
• 10226385Oct 19, 2022Engine cooling, Transmission and drivetrain. This Preliminary information communicates to the dealer technician that if the vehicle's engine coolant reservoir has transmission fluid in it or if Glycol it found in the transmission fluid the dealer should replace the Automatic Transmission Fluid Cooling Exchanger. The dealer should refer to bulletin 08-07-30-035 for the recommended components that should be replaced in the transmission and to flush the engine…
• 10225615Oct 19, 2022Electrical system. This service bulletin provides information on Module Harvesting.
• 10226379Oct 17, 2022Back-over prevention (rear camera). This Preliminary information communicates that a customer may notice that the gridlines on the backup camera are very dim. They may mention that this occurred after an OTA update. The dealer technician is advised to perform no repairs. The technician is advised that engineering is looking into a resolution and the resolution will be communicated through this PI or a bulletin when it becomes available.
• 10225611Oct 17, 2022Body and structure. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the roof panel joint finish molding being detached and/or loose from the roof retaining clip.
• 10225606Oct 17, 2022Electrical system, Equipment, Engine cooling. This service bulletin provides a repair procedure to correct a customer concern of a No Fob detected message on Driver Information Center (DIC) and/or No Crank / No Start condition.
• 10226366Oct 10, 2022Fuel system. This Preliminary information communicates an issue where there is no selection to reset the fuel filter life in the IPC and engineering is working on a fix.
• 10224856Oct 10, 2022Engine cooling, Electrical system. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing.
• 10224850Oct 10, 2022Electrical system, Fuel system, Engine cooling. This bulletin provides a possible location of a bad connection at the reductant fluid tanks electrical connector.

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