Pinpoint Test K: DTC P0731
- Normal Operation and Fault Conditions
The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio diagnostic trouble codes (DTCs) are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition PCM P0731:00 Gear 1 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to first gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled first gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again. Possible Sources
- Transmission fluid contamination
- A solenoid or A clutch stuck off or slipping
- B solenoid or B clutch stuck on or damaged
- Hydraulic selectable one-way clutch (SOWC) slipping or damaged
- K1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, clear the DTC for the PCM.
- Road test the vehicle.
- Using a diagnostic scan tool, carry out the PCM self-test.
Is DTC P0731 present in the PCM?
Yes REFER to: A Clutch . REFER to: B Clutch . REFER to: Hydraulic Selectable One-Way Clutch Assembly . No The fault is not present at this time and may be intermittent.