P2548 — Problem with torque management signal input

The engine control module is detecting an issue with the torque management request input signal B. This signal helps the car manage engine power and torque delivery properly. The code appears when the signal is missing, inconsistent, or out of expected range, which can affect engine performance or drivability.

Common causes

The cause is almost always one of a few things. Here they are — P2548 rarely comes from anything outside this list:

• Faulty torque management sensor or switch
• Damaged or corroded wiring/connectors in signal circuit
• Intermittent electrical connection or short circuit
• ECU software glitch or internal fault
• Aftermarket modifications affecting torque signals

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and clean wiring connectors related to torque signal
2. Inspect wiring harness for damage or corrosion
3. Test torque management sensor or switch operation
4. Update or reflash ECU software if applicable
5. Replace faulty sensor or ECU if necessary

That is what holds for P2548 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.