Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for intermittent conditions in the automatic transmission input (shaft) speed sensor (AT ISS) circuit.
Refer to Intermittent Conditions in Engine Controls - 3.8L.
Inspect for intermittent conditions in the automatic transmission output (shaft) speed sensor (AT OSS) circuit.
Refer to Intermittent Conditions in Engine Controls - 3.8L.
Ask the customer about possible overloading, exceeding the trailer towing limit, or towing in overdrive.
Ensure that the current calibration is correct for the final drive ratio.
Ensure the wiring harness is not stretched too tightly or other components are pressing on A/T inline 20-way the connector body. Also inspect for proper clearance to any other components and wiring. Refer to Intermittent Conditions in Engine Controls - 3.8L.