P2546Torque Management Request Input Signal A Low
- 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
- 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.
- What you may notice
- Harsh or delayed gear changes
- Transmission warning message or check engine light
- Fault often stored together with P2545
- Likely causes
- LikelyOutdated transmission module software (JLR 9HP48 remedy)
- PossibleOil leak or low oil level in the transmission
- RareWired request line shorted to ground
- 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.