P2547 code meaning
Torque Management Request Input Signal A High
Powertrain system Generic code P25xx codes Check engine light
What P2547 means
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.
P2547 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2547
- Shift-related torque reduction no longer works, firmer shifts
- Check engine light depending on make
Common causes of P2547
- PossibleRequest line shorted to a supply voltage
- PossibleRequesting module sends a value above the scale
- Less likelyPoor ground at the requesting module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Torque management input a
What each part of P2547 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 47 | The exact fault in that area. |
What to do next
- Note P2547 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2547
What does P2547 mean?
P2547 means "Torque Management Request Input Signal A High". P2547 is logged when torque request A sits above the highest value the receiving module will accept. It is a generic code, so it means the same on every make.
Is it safe to drive with P2547?
Drive gently and only to a workshop. With P2547 the car can go into limp mode (reduced power) to protect itself.
Will P2547 fail an emissions test?
Yes, it can. P2547 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2547 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2547 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.