General Motors GM Vehicles (Multiple Models) Error Code P3001

General Motors OBD-II Critical Transmission Control

Model: GM Vehicles (Multiple Models) | Code: P3001

Applicable Systems
Chevrolet GMC Buick Cadillac

Symptoms

TCM internal electronic failure; transmission may default to limp mode or fail to shift.

Possible Causes

  • TCM internal processor failure
  • TCM software corruption
  • Power supply circuit fault to TCM

Troubleshooting Steps

  1. Step 1: Check TCM power and ground circuits
    Power and ground within specification
  2. Step 2: Reflash TCM with latest calibration
    Software update successful
  3. Step 3: Replace TCM if internal failure persists
    TCM replaced, transmission shifts normally

How to Reset

Clear codes and perform transmission relearn procedure.

Related General Motors Fault Codes

Source: SAE J2012 Standard, OBD-II Service Manuals

Category: OBD-II