P2548

Code

Generic P — Powertrain

Torque Management Request Input Signal B

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 34 RU: 20

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Open or shorted wiring in the Torque Management Request B circuit
Corroded, loose or damaged connector/terminal at sender or control module
Short to battery or to ground on the signal or reference circuits
Faulty sending module (torque request source: ECM/TCM/BCM/pedal module)
Faulty receiving control module (ECM, TCM or other module monitoring the signal)
Poor ground or low reference voltage

Scan for PIDs and related codes; record freeze frame and live data for Torque Request B and Torque Request A (if present)
Visually inspect wiring and connectors along the harness for damage, corrosion, or water entry
Backprobe the signal connector and compare voltage to expected values with ignition ON and while commanding torque request
Check continuity and resistance between sender and receiving module pins (check for short to ground/power)
Wiggle the harness and connectors while monitoring live data to find intermittent faults
Check module grounds and supply/reference voltages (usually 5 V reference or battery where applicable)

Typical signal type: analog voltage or PWM/duty cycle (varies by manufacturer)
Common expected voltage range (generic): ~0.2–4.8 V for analog sensor signals
Open-circuit or short conditions: near 0 V (short to ground) or near battery voltage/5 V reference (short to power)
If PWM: duty cycle expected to vary with torque request (0–100%); frequency depends on manufacturer
Reference supply typically 5 V (check OEM data); acceptable tolerance often ±0.2–0.5 V

Read and record all stored codes, freeze frame, and live data. Note whether code is current or historic and if other related DTCs are present.
Visually inspect wiring, connectors and component mounting for damage, corrosion, moisture or aftermarket splices.
Identify pins for Torque Request B on the sending module and the receiving control module using OEM wiring diagrams.
With ignition ON (engine OFF) backprobe the signal and reference pins. Measure signal voltage, reference supply and ground. Compare to expected ranges.
If signal is out of range, check for short to power or ground: disconnect the sender and measure the line. If the fault clears with sender disconnected, suspect the sender.
Check continuity between sender and controller pins; measure resistance to ground and to battery. Repair any open or shorted circuits.
Perform wiggle/pressure tests on harnesses/connectors while monitoring live data to locate intermittent faults.
If wiring and connectors are good, swap or bench-test the sender (if possible) or replace the sending module per manufacturer procedure.
If replacement sender does not correct the condition, test or replace the receiving control module only after confirming wiring and power/grounds are good and reprogramming if required.
Clear codes and perform a road/test cycle to confirm the repair. Re-scan for any returning faults.

Broken or chafed wire in the harness between the torque request sender and controller
Corroded pin or connector at sender or controller
Failed accelerator/brake/pedal module or other torque-requesting module
Short to power or ground on the signal wire (causing high or low voltage)
Missing or low 5 V reference or return (ground) to the sensor/module
Software glitch or module needing reprogramming (less common)