OBD-II code · Powertrain (generic, extended)
P2551 Torque Management Request Input Signal B High
Torque management input B reads stuck high — short to reference voltage or message at maximum. ECM rejects the request to avoid unintended high-torque commands.
Is it safe to drive with P2551?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySignal wire shorted to reference voltage
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Torque Management Input B
Related codes
- P2547Torque Management Request Input Signal A High
- P2548Torque Management Request Input Signal B
- P254EPTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic
- P254FEngine Hood Switch Circuit
- P2550Torque Management Request Input Signal B Low
- P2552Throttle/Fuel Inhibit A Circuit
- P2553Throttle/Fuel Inhibit A Circuit Range/Performance
- P2554Throttle/Fuel Inhibit A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.