OBD-II code · Powertrain (generic, extended)
P2550 Torque Management Request Input Signal B Low
Torque management input B reads stuck low — short to ground or message at minimum. ECM rejects the request, only A-side is used.
Is it safe to drive with P2550?
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 ground
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
- P2546Torque Management Request Input Signal A Low
- P2548Torque Management Request Input Signal B
- P254DPTO Speed Selector Sensor/Switch 1 Circuit High
- P254EPTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic
- P254FEngine Hood Switch Circuit
- P2551Torque Management Request Input Signal B High
- P2552Throttle/Fuel Inhibit A Circuit
- P2553Throttle/Fuel Inhibit A Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.