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Service bulletins for the 2005 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.

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

By type

By component

By trouble code

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

Bulletins, newest first
080730035C2018-05-21. Service bulletin. POWER TRAIN. This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
GCUS-9-30912017-12-22. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. 14632C Special Coverage. 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.
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.
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
0707290012007-04-27. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. MG3, M86 TRANSAXLE GRINDING/WHINING NOISE IN 3RD OR 4TH GEAR, EXCESSIVE ENGAGEMENT OR DISENGAGEMENT EFFORT WHILE SHIFTING INTO 3RD OR 4TH GEAR, WILL NOT SHIFT INTO EITHER 3RD OR 4TH GEAR. (REPLACE COMPLETE OUTPUT SHAFT ASSEMBLY). *KB
42522007-03-23. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; LATCHES/LOCKS/LINKAGES; ENGINE AND ENGINE COOLING:ENGINE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. BUCK WHILE DRIVING, STALL, SES LIGHT, FLASH DOOR LOCKS CYCLE, CD PLAYER SKIP, CLOCK RESET. *KB
0507290062005-12-02. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:FLOOR SHIFT. SHIFT CONTROL KNOB LOOSE OR DETACHED FROM SHIFT CONTROL LEVER. *TT
0507300152005-11-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. HARD TO SHIFT OR SELECT VEHICLE GEAR, SHIFTER STICKS/BINDS/JAMS. PONTIAC PURSUIT (CANADA) 2005-2006. *TT
0507300162005-11-09. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). TRANSMISSION CONTROL MODULE (TCM) SHORTED TO BATTERY VOLTAGE DURING DIAGNOSIS AND/OR SERVICE. *TT UPDATED. *NM
32532005-10-24. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. VEHICLE WILL NOT MOVE IN EITHER DIRECTION. TRANSMISSION MAY SHOW OVER FULL. P90 4T40E 4T45E NO MOVEMENT DRIVE OR REVERSE. CONVERTER MAY BE EMPTY OF FLUID. *TT
34472005-10-24. Service bulletin. POWER TRAIN. 4T40E OR 4T45E WILL NOT SHIFT NO DIAGNOSTIC TROUBLE CODES. *TT
34412005-10-21. Service bulletin. POWER TRAIN. 4T40E/4T45E HARD TO SHIFT. *TT
32352005-01-31. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. ENGINEERING INVESTIGATION ON THE NEW TRANSMISSION CONTROL MODULE. *EH

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