Torque Management Feedback Signal High
The P2644 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the torque management feedback circuit. This circuit monitors the torque reduction request from the transmission control module (TCM) during shifts. A high signal suggests a short to voltage, a faulty sensor, or an issue with the TCM or ECM.
01. Most Common Causes
- Faulty torque management feedback sensor
- Short to voltage in the feedback circuit wiring
- Faulty transmission control module (TCM)
- Faulty engine control module (ECM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic transmission shifts
- Reduced engine power or limp mode
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Inspect the wiring and connectors for the torque management feedback sensor for damage or shorts.
Step 3: Test the sensor's voltage and resistance per manufacturer specifications.
Step 4: If wiring and sensor are okay, check TCM and ECM for faults or reprogramming needs.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause transmission damage or unsafe driving conditions due to harsh shifts or power loss.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the TCM or ECM needs replacement.