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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> 948TE/9HP48 - DTCS P1D91-00 To P2802-00 >> DTC Troubleshooting >> P1DDC-00-TCM Monitoring Processor Performance UNALLOWED Reverse Engagement >> Possible Causes

Possible Causes

Possible Causes
TRANSMISSION SPEED SENSOR DTCS SET
OPERATOR ERROR - SHIFT TO PARK WHILE VEHICLE IS MOVING FORWARD

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .

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