Diagnostic Aids

Inspect for proper transmission operation.
Inspect the exhaust system for a possible restriction.
Inspect for lack of engine power, hesitation, stumble or rough idle.
Some intermittent communication concerns may be caused by fretting corrosion on the serial data circuit terminals. Inspect all connectors at the control module that set the communication DTC, the control module that the communication DTC was set against, and any inline harness connectors between the two control modules. Do not replace a control module based only on fretting corrosion.