Powertrain, generic (extended)

P258F Torque Management Request Output Signal

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

CAN wiring or connector fault between the modules
Software levels of sending and receiving module do not match
Low voltage or poor ground at one of the modules
Sending control module internally faulty

Symptoms

  • Check engine lamp on
  • Harsh or delayed shifts
  • Reduced engine power

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,200
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

torque management output

Related codes

P2544P2545P0700

References: gsi.ext.gm.com, law.cornell.edu.