2002 Chevrolet Trailblazer EXT 370 Technical Service Bulletins

64 technical service bulletins (TSBs) are on record for the 2002 Chevrolet Trailblazer EXT 370. 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.

• 11020816Jul 18, 2025Other or unknown. This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.
• 11006621Aug 26, 2024Electrical system. Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to updating affected modules (with some exceptions). The updating of modules is completed in parallel instead of the technician needing to update one module at a time. This allows a more streamlined…
• 11006421Jul 24, 2024Transmission and drivetrain. GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This bulletin advises the dealers to be more careful not to damage the transmissions during removal and to package the core properly for return.
• 11004761Jun 28, 2024Fuel system, Engine. This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
• 11004557Jun 17, 2024Other or unknown. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
• 11002312Jun 6, 2024Electrical system. This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.
• 10252735Mar 28, 2024Electrical system. This bulletin provides information for electrical ground repairs using new General Motors replacement fasteners with conductive finish.
• 10251887Mar 14, 2024Engine cooling. This bulletin advises the technician of possible location of an internal coolant leak from a specific cylinder head and location.
• 10251890Mar 13, 2024Engine cooling. This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
• 10250775Feb 22, 2024Engine 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.
• 10249590Jan 16, 2024Equipment. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
• 10249579Jan 12, 2024Engine cooling, Transmission and drivetrain. This PI bulletin advises the technician on the proper way to install the pistons in an engine.
• 10249011Jan 12, 2024Exterior lighting. This informational bulletin provides information for dealers/technicians on Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage.
• 10247552Dec 12, 2023Equipment. This service bulletin provides information on Concerns or Questions Regarding Installation of Dealer Installed Accessories.
• 10244274Oct 6, 2023Wheels. This service bulletin provides information about the Hunter wheel Road Force balancers that should be utilized for all repairs requiring balance and Road Force measurement.
• 10244201Sep 26, 2023Equipment. This service bulletin provides information for dealers on how to submit a product information report (PIR) (Canada Only).
• 10242843Sep 1, 2023Transmission and drivetrain, Engine cooling. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
• 10242262Aug 24, 2023Engine 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.
• 10235799Apr 27, 2023Wheels. This service bulletin provides information about the Hunter wheel Road Force balancers that should be utilized for all repairs requiring balance and Road Force measurement.
• 10235802Apr 24, 2023Engine cooling. This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
• 10234141Mar 23, 2023Engine cooling. This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
• 10234110Mar 17, 2023Engine cooling. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
• 10232287Feb 21, 2023Equipment. This warranty administration bulletin provides information regarding the field action courtesy transportation policy.
• 10232136Feb 15, 2023Exterior lighting. This service bulletin provides information for dealers/technicians on Exterior Lamp Condensation and Water Leaks and Replacement Guidelines.
• 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.
• 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.
• 10225615Oct 19, 2022Electrical system. This service bulletin provides information on Module Harvesting.
• 10224820Oct 7, 2022Equipment. This service bulletin provides information for dealers on how to submit a product information report (PIR) (Canada Only).
• 10222839Sep 28, 2022Equipment. This service bulletin provides information on Handling Requests for Modifications to Permanently Import/Export Vehicles Between the U.S. and Canada.
• 10222796Sep 14, 2022Engine cooling. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
• 10220319Sep 1, 2022Transmission and drivetrain. This diagnostic tip advises the tech not to separate the flexplate from the torque convertor or damage my occur if the engine is started while diagnosing for noise from the engine or transmission.
• 10219266Aug 15, 2022Engine cooling. This bulletin provides information on tools available to find an intake vacuum leak or exhaust leak to correct a condition of MIL Illuminated with Multiple Fuel Trim and/or Oxygen Sensor Codes Set.
• 10214869Jun 15, 2022Engine cooling. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
• 10209980Mar 31, 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.
• 10209921Mar 22, 2022Engine cooling. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
• 10171878Jan 2, 2020Equipment, Fuel system. This informational bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
• 10082869Aug 29, 2016Engine. This informational bulletin provides additional information on how to install pistons and suggest what tools to use.
• 10082506Aug 26, 2016Equipment. This technical bulletin provides a procedure to reprogram the media disc player with the latest calibrations to correct a condition of the rear entertainment system not operating as intended in colder ambient temperature areas due to calibration concerns.
• 10082814Aug 2, 2016Engine. This informational bulletin provides information to gm dealers on the correct cleaning methods when cleaning engine gasket sealing surfaces.
• 10083898Apr 27, 2016Electrical system, Equipment. This preliminary information communication advises the technician if unable to place an onstar call in the ignition on mode after the onstar canada upgrade, to contact the gm technical assistance center onstar group for further assistance.
• 10083509Apr 21, 2016Equipment. This preliminary information communication advises the technician on the steps to diagnose and repair the concern. The vehicle's xm radio only has xm preveiw channels.
• 10083884Apr 19, 2016Equipment. This preliminary information communication advises the technician on the steps for diagnosing the concern. The vehicle may be unable to connect to onstar using the white, blue or red onstar buttons.
• 10083489Apr 19, 2016Equipment. This preliminary information communication advises the technician the steps on repairing the concern. A customer may identify a concern of unable to reactivate a vehicle's onstar that has been previously disabled by onstar. Dealer is to call general motors technical assistance center for further assistance if the concern is still present.
• 10083484Apr 19, 2016Electrical system. This preliminary information communication provides information to help the dealership technicians perform a parasitic drain test for the onstar module. When performing battery parasitic drain test, there may be some confusion as to what the normal power consumption reading should be from the onstar system.
• 10078735Apr 19, 2016Electrical system. This preliminary information communication provides information to help the dealership technicians perform a parasitic drain test for the onstar module. When performing battery parasitic drain test, there may be some confusion as to what the normal power consumption reading should be from the onstar system.
• 10078734Apr 19, 2016Electrical system. This preliminary information communication advises the technician the steps on repairing the concern. A customer may identify a concern of unable to reactivate a vehicle's onstar that has been previously disabled by onstar. Dealer is to call general motors technical assistance center for further assistance if the concern is still present.
• 10083900Apr 8, 2016Electrical system, Equipment. This preliminary information communication advises the technician, if unable to place an onstar call in the ignition on mode after the onstar canada upgrade to contact the gm technical assistance center onstar group for further assistance.
• 10201115Dec 1, 2015Equipment, Other or unknown. OnStar Voice Fallback Number Update
• 10190512Dec 1, 2015Electrical system, Equipment. OnStar® Voice Fallback Number Update Some customers may have received a letter from OnStar® stating that "We recently tried to provide a software update to the OnStar® hardware in your vehicle. However, your system could not be updated remotely.
• 10095317Jan 15, 2015Equipment. 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.

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