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GMC TSB #15396
2015 GMC Sierra 3500
TSB Document:
Affected Component: POWER TRAIN:AUTOMATIC TRANSMISSION
- Summary
- "15396 - SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO INSTALL THE ORIGINAL DESIGN TEMPERATURE-SENSOR WIRING HARNESS TO THE VALVE BODY ON CERTAIN 2015 MODEL YEAR CADILLAC ESCALADE AND ESCALADE ESV; CHEVROLET SILVERADO; AND GMC SIERRA, YUKON, AND YUKON XL VEHICLES. THE SUPPLIER OF THE TRANSMISSION-WIRING HARNESS INTRODUCED AN UNAPPROVED CHANGE TO THE TEMPERATURE SENSOR (THERMISTOR), RESULTING IN INCORRECT OIL-TEMPERATURE READINGS DURING TRANSITION FROM COLD TO WARM TEMPERATURES. THIS COULD CAUSE A HARSH SHIFT WHEN STARTING THE VEHICLE AT TEMPERATURES BELOW 32ºF (0ºC); HOWEVER, SHIFT QUALITY IMPROVES ONCE THE TRANSMISSION OIL WARMS UP."
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