P2549

Code

LAND ROVER P — Powertrain

Input signal of torque management request B - range / performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 12 EN: 20 RU: 11

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Page language: EN

Causes

Damaged or corroded connector or wiring in the torque-request B circuit
Open, short to ground or short to battery in the signal wire
Faulty torque request sensor or sender (B) or associated module
Poor or intermittent ground or supply to the sensor/module
Intermittent or lost communication between modules (CAN bus issues)
Faulty PCM/TCM internal circuitry or software error

Symptoms

MIL (engine/traction) illuminated
Reduced engine torque or limp-home mode
Erratic throttle/torque delivery, hesitation or surging
Transmission shift abnormalities or reduced drivability
Stored related communication or sensor codes

What to check

Read all stored and pending DTCs and freeze-frame data from all control modules
Check for related CAN/communication codes (U-codes) and module presence
Visually inspect wiring and connectors for damage, corrosion, or pin push-out
Verify proper reference voltage and ground at the sensor and module
Observe live data / signal value for torque request B while operating throttle
Wiggle test harnesses and connectors while watching live data for intermittent faults

Signal parameters

Typical signal type: low-voltage analog (0–5 V) or low-voltage digital; consult vehicle-specific data
Expected behavior: smooth, proportional change with driver torque demand; no abrupt jumps or flatlines
Quiescent voltage and dynamic range: must match OEM reference values (use factory data)
Signal should not be shorted to battery (near 12 V) or ground (near 0 V)

Diagnostic algorithm

Connect a diagnostic scanner, record freeze-frame and related codes from PCM and other modules.
Inspect the harness and connectors for the torque request B circuit (sensor/module end and PCM/TCM end). Repair visible damage.
Back-probe the signal, supply, and ground terminals. Measure voltage(s) with key on and during a controlled throttle test; compare to factory reference.
Check continuity and resistance between sensor and PCM connector pins; check for shorts to battery and ground.
Use an oscilloscope if available to evaluate signal waveform for noise, dropouts, or abnormal edges.
If wiring, connector, and supply/ground test good, verify module communications and perform a module scan for pending errors or software updates.
Try clearing codes and performing a test drive to see if code returns; if intermittent, perform long-term logging.
If all electrical checks pass and problem persists, consider replacing the sensor/sender B or reprogramming/replacing the controlling module per manufacturer guidance.
After repair, clear codes and confirm proper operation and that the code does not return.

Likely causes

Connector corrosion or pin damage at sensor or control module
Frayed/chafed wiring causing intermittent short
Failed torque request sensor or actuator (sensor B)
Missing or high-resistance ground at sensor or module
Module software needing reflash or known calibration fault

Fault status

⚠️ Status

PCM/TCM detected torque management request B signal out of range or performing outside expected parameters. The condition may be stored as active or pending; further live-data and electrical checks required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P2549 — Input signal of torque management request B - range / performance