P2544: Torque Management Request Input Signal A

What it means

A fault is detected in torque management request input signal A. The code does not identify the requesting module or communication fault.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

Torque management request input signal A carries a request for the powertrain to limit or adjust engine torque, often as part of coordination between control modules. P2544 indicates a fault with that input, but does not identify which module sent the request or whether the problem is in the communication link or a module.

Common causes

Most likely first.

1. CAN communication error
2. Fault in requesting module

Symptoms

• Check-engine or transmission warning light
• Reduced engine power or altered acceleration
• Transmission shifts may feel different

How to diagnose it

1. Review freeze-frame data and scan for related powertrain, transmission, and communication codes before clearing anything.
2. Check live data for torque management request input signal A and compare it with other available module status information.
3. Inspect accessible module and network connectors for looseness, corrosion, or wiring damage, using the vehicle's wiring diagram.
4. Check whether communication faults are shared across modules and test the relevant network circuits using the manufacturer's procedure.
5. If the network checks pass, follow the service procedure to isolate the requesting module or the module receiving signal A.

Common fixes

• Repair a loose, corroded, or damaged connector affecting the relevant module communication.
• Repair a verified communication network wiring fault.
• Update or configure a module only if the vehicle's service information calls for it and diagnosis supports it.
• Replace a faulty requesting or receiving module only after circuit and communication checks identify it.

Can I keep driving?

If engine power is reduced or transmission behavior changes, drive gently and avoid overtaking, towing, or demanding acceleration. If the vehicle cannot accelerate predictably, stop in a safe place and arrange assistance.