Technical Service Bulletin 14308A — 2008 GMC SIERRA 3500
POWER TRAIN:AUTOMATIC TRANSMISSION
Bulletin Details
| TSB ID | 14308A |
| Manufacturer | |
| Vehicle | 2008 GMC SIERRA 3500 |
| Component | POWER TRAIN:AUTOMATIC TRANSMISSION |
| Communication Date |
Bulletin Summary
14308A - SPECIAL COVERAGE (REVISED PART INFORMATION, SERVICE PROCEDURE AND WARRANTY TRANSACTION INFORMATION). SOME VEHICLES EQUIPPED WITH A 6 SPEED AUTOMATIC TRANSMISSION (RPO MW7), MAY HAVE A CONDITION IN WHICH INCREASED TRANSMISSION OIL COOLING CIRCUIT PRESSURE MAY CAUSE TRANSMISSION FLUID TO WEEP OR LEAK. THIS LOSS OF FLUID OCCURS NEAR THE TRANSMISSION COOLER AT THE CRIMP JOINTS ON THE METAL ENDS OF THE COOLER LINE WHERE IT JOINS THE RUBBER HOSE. THE INCREASED OIL COOLING CIRCUIT PRESSURE IS EXPERIENCED DURING VEHICLE OPERATION AT EXTREME LOW OUTDOOR TEMPERATURES. DEALERS ARE TO INSPECT THE TRANSMISSION OIL COOLER LINES AND REPLACE IF LEAKING.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.
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