P2641: Torque Management Feedback Signal - B Circuit Low
The P2641 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the torque management feedback signal B circuit. This circuit is part of the torque management system, which adjusts engine torque to protect the transmission during shifts. A low signal suggests a short to ground, open circuit, or faulty component, potentially affecting transmission shift quality and engine performance.
01. Most Common Causes
- Faulty torque management feedback sensor
- Short to ground in the signal circuit
- Open or damaged wiring/connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed transmission shifts
- Reduced engine power or limp mode
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2641 and check for related codes.
Step 2: Visually inspect the torque management feedback sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground with a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts or opens in the circuit between the sensor and PCM.
Step 5: If all else is fine, test the PCM or have it reprogrammed.
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 and reduced vehicle control. Seek repair promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause (sensor replacement, wiring repair, or PCM replacement).