OBD-II code · Powertrain (generic, extended)
P2643 Torque Management Feedback Signal B Low
The torque feedback signal B reads below its valid range. Source sends a value below physical possibility or the bus signal is stuck low.
Is it safe to drive with P2643?
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
- Secondary Torque User, Communication Bus
Related codes
- P2639Torque Management Feedback Signal A Low
- P2640Torque Management Feedback Signal A High
- P2641Torque Management Feedback Signal B
- P2642Torque Management Feedback Signal B Range/Performance
- P2644Torque Management Feedback Signal B High
- P2645A Rocker Arm Actuator Control Circuit / Open Bank 1
- P2646A Rocker Arm Actuator System Performance/Stuck Off Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.