P2548
Torque Management Request Input Signal B
Powertrain torque management
Generic OBD-II
Medium
What it means
P2548 means the engine computer received an invalid or out-of-range torque-request signal on its "B" input. Modules such as the transmission or traction controller send these requests to coordinate engine torque, so this code usually points to wiring between modules or a faulty requesting module rather than a mechanical engine fault.
Medium
Can I keep driving? Often drivable, but torque coordination between modules may be affected, so you might notice reduced power, harsh shifts, or a limp-mode fallback.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power or limited throttle response
- Harsh or unexpected transmission shifts
- Possible limp mode
Common causes
Most likely first
- Wiring fault (open, short, or high resistance) in the torque-request 'B' circuit between modulesLikely
- Corroded or loose connectors at the ECM/TCM or requesting moduleCommon
- Faulty requesting module sending an invalid torque signalCommon
- Poor ground affecting the shared signalLess often
- Software/calibration mismatch between the involved modulesLess often
How to diagnose & fix
Work through it in order
- Scan all modules for related codes; a torque-request fault usually accompanies other module codes that point to the source.
- Inspect the connectors and wiring between the requesting module and the ECM/TCM.
- Check power and grounds to the involved modules.
- Back-probe the torque-request 'B' circuit and verify the signal against spec.
- Repair wiring or address the faulty module, confirm calibrations are current, then clear and road-test.
FAQ
Quick answers
Is it safe to drive with P2548?+
Short term usually, but if you feel reduced power or rough shifting, drive gently and get it diagnosed to avoid drivetrain stress.
Can I just clear P2548?+
It returns until the underlying wiring or module fault is fixed. Diagnose the source code alongside it first.
Related codes
Often seen with P2548
Read & clear P2548 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX