OBD-II code · Powertrain (generic, extended)
P2638 Torque Management Feedback Signal A Range/Performance
The torque feedback signal A is present but its value is implausible against measured engine load and speed. Sender calibration or sensor offset is suspected.
Is it safe to drive with P2638?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleSender calibration drift
- PossibleBus value corrupted by EMI
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm, Torque Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.