P2550Torque Management Request Input Signal B Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2550 marks the second torque request input, B, as stuck below its lower limit. A hard-wired line would be pulled to ground by chafed insulation or a fault in the sending stage; in a networked design the sender would be reporting a value that lies under the bottom of the defined range. The engine module then disregards input B and keeps running on its own torque calculation. No maker documents P2550 publicly. GM's 2019 table 19OBDG03A assigns the B channel to the traction request of the electronic brake and traction control module, sent in messages $1C8/$237, and checks it only with the general code P2548. CARB requires electronic inputs to be monitored for out-of-range values when they influence emissions. P2551 is the high-side fault, P2546 the low fault on input A.
- What you may notice
- Check engine light depending on make
- Traction-related torque reduction no longer applied
- Likely causes
- PossibleRequest line chafed through and shorted to ground
- PossibleOutput stage of the requesting module defective
- RareCorroded or water-logged connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.