P2547Torque Management Request Input Signal A High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2547 is logged when torque request A sits above the highest value the receiving module will accept. A wired input would read like a line touching a supply voltage or a lost ground at the sender; a bus message would carry an out-of-scale number. The receiver ignores such a request, since following it could mean an unwanted torque increase. No maker documents P2547 publicly. How input A is checked can be seen in GM's 2020 table 20OBDG04, where the engine module tests the transmission module's torque messages for protection value, rolling counter and an upper torque limit of 1,298 Nm, but under the general code P2544 rather than a separate high code. CARB requires such inputs to be monitored when they affect emissions or other diagnostics. P2546 is the low side, P2551 the high fault on input B.
- What you may notice
- Shift-related torque reduction no longer works, firmer shifts
- Check engine light depending on make
- Likely causes
- PossibleRequest line shorted to a supply voltage
- PossibleRequesting module sends a value above the scale
- RarePoor ground at the requesting module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.