P1250

Code

LAND ROVER P — Powertrain

Malfunction of the throttle valve spring

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 18 EN: 38 RU: 27

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Page language: EN

Causes

Worn, broken or weak throttle return spring in the throttle body
Carbon buildup or deposits causing throttle plate binding
Mechanical interference or foreign object in throttle bore
Faulty throttle body actuator or motor (electronic throttle)
Damaged or misaligned throttle plate linkage
Faulty throttle position sensor(s) or harness/connectors

Symptoms

Erratic idle or high idle
Poor or delayed throttle response
Reduced engine power / limp-home mode
Check Engine Light (MIL) illuminated with P1250 stored
Surging or stalling at idle or low speed
Possible throttle hesitation during acceleration

What to check

Read and record freeze-frame and any additional DTCs with a capable scan tool
Visually inspect throttle body for carbon buildup, foreign objects, and spring condition
Check wiring and connectors for the throttle actuator and TPS for damage or corrosion
Monitor live data: commanded throttle plate position vs actual position, TPS voltages, actuator current/duty
Check battery and charging system voltage (should be roughly 12–14.5 V with engine off/running)
Check for mechanical play or binding by manually operating throttle plate (with ignition off) and feeling for resistance or rough spots

Signal parameters

Closed throttle plate angle: typically near 0–5° (model dependent)
TPS (throttle position sensor) voltage at closed: typically ~0.2–1.0 V (varies by model)
TPS voltage at wide open throttle: typically ~3.5–4.8 V (varies by model)
Expected difference between commanded and actual throttle plate: usually
Battery/system voltage: ~12–14.5 V
Actuator duty cycle/current: varies widely by design — compare commanded vs actual values on live data

Diagnostic algorithm

Connect a diagnostic scanner capable of live data and special functions. Read and record P1250 plus any related codes and freeze-frame data.
With ignition on (engine off), observe throttle plate position commanded vs actual. Manually open/close throttle plate to check for smooth movement and to detect binding or rough spots.
Visually inspect throttle body bore, plate edges, shaft and return spring. Clean carbon deposits and recheck movement. Replace spring if visibly damaged or weak.
Inspect wiring harness and connectors to the throttle actuator and TPS for corrosion, broken wires, or poor connections. Wiggle-test while monitoring live data for intermittent changes.
Start engine (if safe) and monitor live data during idle and commanded throttle changes: compare commanded angle vs actual. Note any large discrepancies, delayed return to closed position, or inconsistent sensor voltages.
If binding persists after cleaning and mechanical inspection, perform actuator bench test or use OEM actuator diagnostic to verify motor torque and spring return. Replace throttle body if actuator or internal gears fail.
After repair or replacement, clear codes and perform throttle adaptation/relearn procedure per Land Rover service literature. Re-test under various conditions and confirm P1250 does not return.
If electrical faults suspected, perform pin-to-pin voltage and resistance checks against manufacturer specifications before replacing parts. Check ECU grounds and supply voltages.
If intermittent or unresolved, consult manufacturer bulletins/software updates; consider ECU calibration or software as a last step.

Likely causes

Throttle plate binding from carbon deposits or contamination
Weakened or broken throttle return spring (mechanical)
Faulty throttle actuator/motor or internal gear failure
Electrical fault in throttle motor/position sensor circuit (wiring, connector)
Throttle body mechanical wear or seized shaft

Fault status

⚠️ Status

Malfunction of the throttle valve spring — throttle plate return or behavior not within expected parameters; inspect throttle assembly and related circuits.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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P1250 — Malfunction of the throttle valve spring