TF1 - Continuous DTC 0720: Perform Transmission Drive Cycle

Continuous Memory Diagnostic Trouble Code (DTC) 0720 indicates an intermittent fault or a hard fault is present. Perform a transmission drive cycle to identify which condition exists. If the DTC repeats, a hard fault is present.

Possible Causes:
- Transmission (internal components).
- Damaged OSS.
- Damaged harness circuits.
- Damaged PCM.

Transmission Drive Cycle:

- Record and clear Continuous DTCs.

- Warm engine to operating temperature.

- Place gear selector in DRIVE.

- Accelerate heavily to 35 mph. (Obey all local laws.)

- Return to idle.

- Shut the Engine Off.

- After drive cycle is completed, run Key On Engine Off (KOEO) Self-Test.

- Did Continuous DTC 0720 repeat?

YES -- GO to TF2. TF2 - Check OSS Circuit Continuity

NO -- The fault that produced DTC 0720 is intermittent. For further diagnosis, GO to Pinpoint Test Step Z1 with the following data: OSS PID, 11B5 = actual OSS output, and the list of Possible Causes. Z1 - Intermittent Test Procedure