This bulletin applies to 2008 Chevy Cobalt vehicles equipped with the 4T45E transmission (including both non-BAS Hybrid and BAS Hybrid models).
This bulletin applies to 2008 Chevy Cobalt vehicles equipped with the 4T45E transmission (including both non-BAS Hybrid and BAS Hybrid models).
Non-BAS Hybrid:
The customer may have a complaint of a chuggle or stall when coming to a stop. The vehicle will restart. This may be caused by a momentary applied torque converters causing excessive loads on the engine.
BAS Hybrid:
If this condition is experienced on a BASH Hybrid, the engine tachometer will drop to zero and not Auto Stop. There would not be a command for an auto-stop. The engine may restart using the 12V starter and set a DTC P1A6F. This may lead the technician to incorrectly suspect the hybrid components.
A partially or momentarily applied TCC may be caused by a restriction in the transmission cooling system. A possible restriction in the transmission cooling system may not allow a sufficient volume of fluid to properly release the TCC.
In order to properly diagnose for a possible restriction, use J45096 or equivalent to flow test the transmission oil cooler pipes. If the flow rate is below minimum, check the following areas:
Transmission cooler for restriction
Transmission cooler lines for bends/kinks
Transmission cooler line fluid passages (behind the fittings) for any restriction
Learn how electronic parking brake actuators have replaced manual systems and now play a key role in advanced safety features like automatic emergency braking. This WIYB Training...
Not all fuel injectors are created equal. In this WIYB Training Series, we compare Standard® Fuel Injectors against OE, low-cost imports. See why precision engineering and rigorous...
Carrying active OEM subscriptions for all manufacturers is not possible for many shops. However, access to this software is required for certain modern vehicles and repairs, and...
Enhance your collision repair workflow with Autel’s IA900, a process-driven solution integrating precision alignment, bi-directional diagnostics, and ADAS calibration. Designed...
Voice Your Opinion!
To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!
