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Service bulletins for the 2008 Chevrolet Cobalt

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.

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

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Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
030729004I2017-12-22. Service bulletin. POWER TRAIN. This informational bulletin was created for the Manual Transmission Operating Characteristics. The different noises caused by driver habit, weather conditions , and normal manual transmission noises.
1203100022017-12-22. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. This informational bulletin provides a description of the proper wheel installation and proper wheel torque techniques used to install wheels onto vehicles
09-07-30-018C2017-10-12. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. This warranty administration bulletin provides information on the change in automatic transmission add conditions documentation and claim submissions
02-07-30-052J2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. This informational bulletin provides technicians with information regarding automatic transmission oil cooler flow test essential tool J-45096 TransFlow®.
06-00-89-026L2017-08-15. Service bulletin. SERVICE BRAKES; EQUIPMENT:ELECTRICAL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER; POWER TRAIN:AXLE ASSEMBLY; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM. This warranty administration bulletin provide policy information on a revised customer concern not duplicated/verified labor operation numbers and how to submit CCND.
14632B2017-02-01. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. 14632B - SPECIAL COVERAGE (REVISED PART INFORMATION). ON SOME VEHICLES EQUIPPED WITH AN AUTOMATIC TRANSMISSION, THE VEHICLE’S TRANSMISSION SHIFTER MAY NOT PROPERLY TRANSMIT AN ELECTRICAL SIGNAL THAT ALLOWS THE IGNITION KEY TO BE TURNED COUNTER CLOCKWISE PAST THE ACCESSORY MODE TO THE “LOCK” POSITION AFTER THE VEHICLE HAS BEEN SHIFTED INTO PARK. IF THIS OCCURS, THE IGNITION KEY CANNOT BE REMOVED FROM THE IGNITION CYLINDER WITHOUT DEPRESSING THE MANUAL RELEASE PLUNGER LOCATED ON THE UNDERSIDE OF THE STEERING COLUMN AS DESCRIBED IN THE OWNER’S MANUAL. A KEY LEFT IN THE ACCESSORY POSITION FOR AN EXTENDED PERIOD OF TIME MAY RESULT IN SEVERE BATTERY DRAIN AND A POSSIBLE NO START CONDITION. IN MOST CASES, DEALERS ARE TO REPLACE THE AUTOMATIC TRANSMISSION SHIFTER. HOWEVER, THE SERVICE PROCEDURE ALSO REQUIRES DEALERS TO UTILIZE DIAGNOSTIC INFORMATION TABLE IN SI TO ELIMINATE OTHER POSSIBLE CAUSES BEFORE REPLACING THE AUTOMATIC TRANSMISSION SHIFTER.
PIP-3869-B2016-08-26. Service bulletin. ELECTRICAL SYSTEM:WIRING; POWER TRAIN:AUTOMATIC TRANSMISSION. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN TO ASSISTANCE DIAGNOSING AND REPAIRING VEHICLES THAT MAY HAVE AN INTERMITTENT CONCERN WITH ANY OF THE TRANSMISSION ELECTRICAL OR COMMUNICATION DIAGNOSTIC TROUBLE CODES. TECHNICIAN WILL INSPECT THE TRANSMISSION WIRING HARNESS THAT IS UNDER THE BEAUTY COVER FOR THE ENGINE. IT MAY BE PINCHED AT THE ENGINE BLOCK NEAR THE OIL FILTER OR HAVE A BARE SPOT. IF NO PROBLEM IS FOUND, THEN CHECK THE 20 WAY CONNECTOR FOR PROPER CONNECTION AND PIN FIT AND FULLY RESEAT THE 20 WAY CONNECTOR. IF THERE ARE NO ISSUES FOUND WITH THE 20 WAY CONNECTOR USE SERVICE INFORMATION FOR THE DIAGNOSTIC TROUBLE CODE INSTRUCTIONS.
PIP-3869-C2016-08-26. Service bulletin. ELECTRICAL SYSTEM:WIRING; POWER TRAIN:AUTOMATIC TRANSMISSION. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN TO ASSISTANCE DIAGNOSING AND REPAIRING VEHICLES THAT MAY HAVE AN INTERMITTENT CONCERN WITH ANY OF THE TRANSMISSION ELECTRICAL OR COMMUNICATION DIAGNOSTIC TROUBLE CODES. TECHNICIAN WILL INSPECT THE TRANSMISSION WIRING HARNESS THAT IS UNDER THE BEAUTY COVER FOR THE ENGINE. IT MAY BE PINCHED AT THE ENGINE BLOCK NEAR THE OIL FILTER OR HAVE A BARE SPOT. IF NO PROBLEM IS FOUND, THEN CHECK THE 20 WAY CONNECTOR FOR PROPER CONNECTION AND PIN FIT AND FULLY RESEAT THE 20 WAY CONNECTOR. IF THERE ARE NO ISSUES FOUND WITH THE 20 WAY CONNECTOR USE SERVICE INFORMATION FOR THE DIAGNOSTIC TROUBLE CODE INSTRUCTIONS.
SB-03-07-29-004K2016-08-06. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. THIS INFORMATIONAL BULLETIN PROVIDE INFORMATION ON THE OPERATING CHARACTERISTICS OF A MANUAL TRANSMISSION.
PIP-46742010-07-23. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. CHEVROLET/PONTIAC/SATURN: BLOCKED SHIFT, GEAR HOP OUT 1ST, 3RD, 5TH GEAR OR DIFFICULTY SHIFTING. THE SHIFT LEVER ON THE MANUAL TRANSMISSIONS ROLL PIN CAN BACK OUT AND CONTACT THE SHIFT COVER DURING A SHIFT EVENT. THIS CAN CAUSE AN INCOMPLETE, BLOCKED SHIFT OR DIFFICULTY SHIFTING THE TRANSMISSION. *PE
PIP-46512010-06-08. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. SATURN/PONTIAC/CHEVROLET: SOFT SHIFTS, ERRATIC SHIFTS, DTC P1811. VEHICLES WITH A HYDRAMATIC 4T45 TRANSAXLE MAY HAVE SOFT SHIFTS OR SHIFTS ERRATICALLY. THESE CONDITIONS MAY APPEAR INTERMITTENTLY OR SET A DTC P1811. DURING DIAGNOSIS, A LOW OR HIGH LINE PRESSURE (ACTUAL VERSUS DESIRED) MAY BE OBSERVED. *PE
PIP-46382010-04-12. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. CHEVROLET: DIFFICULT TO SHIFT OR UNABLE TO SELECT ALL GEARS. THE TRANSMISSION IS DIFFICULT TO SHIFT AND/OR IT CANNOT BE SHIFTED INTO ALL GEARS. THIS CONDITION MAY BE CAUSED BY A LOCATOR PIN LEFT IN PLACE THAT WAS MEANT TO BE REMOVED AT THE ASSEMBLY PLANT OR A SHIFT CABLE OUT OF POSITION. (COBALT SS/HHR SS). *PE
SB-091262010-02-17. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. CHEVROLET: SERVICE UPDATE FOR INVENTORY AND CUSTOMER VEHICLES CHARGE AIR COOLER INLET DUCT DETACHMENT - EXPIRES WITH BASE WARRANTY. *PE
TB-09-07-30-0092009-08-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. GENERAL MOTORS: AN AUTOMATIC TRANSMISSION CONCERN OF NO MOVEMENT, NO REVERSE OR SLIPPING. THESE CONCERNS MAY BE DUE TO AN ISSUE WITH THE DIRECT CLUTCH. *PE
08-07-30-0342008-09-24. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. GMC: 4T45-3 AUTOMATIC TRANSMISSION (RPO MN5/ME7) - NO REVERSE, BINDS IN REVERSE, NO MOVEMENT, DTC P0756 (PERFORM APPROPRIATE REPAIR AS OUTLINED IN BULLETIN). ON SOME HYBRID AND NON-HYBRID VEHICLES. *PE
07071290012008-03-31. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL). EI07280 - KEY CAN NOT BE REMOVED FROM IGNITION WITH TRANSAXLE SELECTOR IN PARK, SHIFTER CAN NOT BE MOVED FROM PARK POSITION (DIAGNOSE USING SI). *NJ

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