TRANSMAX NOTE: This guide is educational. Vehicle symptoms can have more than one cause, so diagnosis is required before deciding what repair is appropriate.
Diagnostic trouble codes are clues
A code points toward a circuit, system or operating condition; it does not automatically identify the failed part.
Transmission codes may be stored
Shift performance, ratio errors, solenoid circuits, temperature and pressure-related faults can all set codes.
Engine and transmission systems overlap
Throttle input, engine load, speed sensors and network communication can affect transmission behavior.
Do not clear codes before testing
Clearing codes can erase useful freeze-frame or historical information that helps reproduce the problem.
Diagnosis confirms the cause
Testing should verify the circuit, component or operating condition before a repair decision is made.