P258FTorque Management Request Output Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P258F concerns the sending side of a torque management link. One controller – for example the engine module talking to a transmission or hybrid controller, or the reverse – transmits torque requests and finds that its own output is faulty, missing or not accepted by the receiver. The receiving side is better documented as P2544 and following: GM's 2020 table 20OBDG04 checks incoming torque requests from the TCM for a wrong protection value, a broken rolling counter and implausible magnitudes, Type B. No manufacturer documents P258F publicly. CARB's rule requires output components driven by a computer to be checked for correct functional response where feasible, which is the logic behind such a code. Typical causes are CAN wiring, mismatched software after programming or a faulty module. Harsh shifts or reduced power can follow.
- What you may notice
- Check engine lamp on
- Harsh or delayed shifts
- Reduced engine power
- Likely causes
- LikelyCAN wiring or connector fault between the modules
- PossibleSoftware levels of sending and receiving module do not match
- PossibleLow voltage or poor ground at one of the modules
- RareSending control module internally faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.