OBD-II code · Powertrain (generic, extended)
P2639 Torque Management Feedback Signal A Low
The torque feedback signal A reads below its valid range. Either the source reports a value below physical possibility or the bus signal is stuck low.
Is it safe to drive with P2639?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySource module sends invalid low value
- PossibleSignal stuck low on the bus
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, Communication Bus
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.