P2642: Torque Management Feedback Signal Range/Performance
The P2642 code indicates that the Powertrain Control Module (PCM) has detected a problem with the torque management feedback signal circuit. This signal is used by the PCM to monitor the torque converter clutch (TCC) operation and engine load. The code is set when the signal voltage or frequency is outside the expected range, often due to a faulty torque converter clutch solenoid, wiring issues, or a malfunctioning PCM. This can lead to improper torque converter lockup, affecting fuel economy and drivability.
01. Most Common Causes
- Faulty torque converter clutch (TCC) solenoid
- Wiring or connector issues in the torque management feedback circuit
- Malfunctioning PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Transmission slipping or harsh shifting
- Torque converter not locking up properly
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Inspect the wiring and connectors for the torque management feedback signal circuit for damage, corrosion, or loose connections.
Step 3: Test the TCC solenoid resistance and operation using a multimeter and scan tool.
Step 4: If wiring and solenoid are okay, check for PCM software updates or replace the PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as it can cause transmission damage and poor fuel economy. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost to fix P2642 typically ranges from $50 to $150 for diagnosis and simple repairs like wiring fixes, but can be higher if the TCC solenoid or PCM needs replacement.