P2546 code meaning
Torque Management Request Input Signal A Low
Powertrain system Generic code P25xx codes Check engine light
What P2546 means
P2546 says that torque request A, the channel over which one module asks another to raise or cut engine torque, reads below its permitted floor. On a hard-wired request this points to a line pulled toward ground; on a data-bus request it means a value pinned at or under the minimum the receiver accepts. Jaguar is the clearest user: SSM73594 (December 2017) covers the 2018MY E-Pace with the ZF 9HP48 nine-speed, whose transmission module stores P2546-86, sometimes together with P2545-86, while the root cause was still being investigated. The dealer sequence is leak check, oil level, newer TCM software, then clear and only call technical assistance if it returns; Land Rover issued a matching note, SSM73291, for its own 9HP48 models. P2547 is the high-side counterpart. Drivers may notice rough or delayed shifts.
P2546 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 P2546
- Harsh or delayed gear changes
- Transmission warning message or check engine light
- Fault often stored together with P2545
Common causes of P2546
- Most likelyOutdated transmission module software (JLR 9HP48 remedy)
- PossibleOil leak or low oil level in the transmission
- Less likelyWired request line shorted to ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Torque management input aTCM
What each part of P2546 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. |
| 46 | The exact fault in that area. |
What to do next
- Note P2546 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 P2546
What does P2546 mean?
P2546 means "Torque Management Request Input Signal A Low". P2546 says that torque request A, the channel over which one module asks another to raise or cut engine torque, reads below its permitted floor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2546?
Drive gently and only to a workshop. With P2546 the car can go into limp mode (reduced power) to protect itself.
Will P2546 fail an emissions test?
Yes, it can. P2546 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 P2546 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2546 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.