P0001

Code

LAND ROVER P — Powertrain

Fuel airbag volume control - circuit / open

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 24 EN: 51 RU: 44

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Page language: EN

Causes

Open or intermittent wiring in the control circuit (broken conductor, damaged insulation)
Corroded or loose connector at the actuator or ECM
Blown fuse or faulty relay supplying the circuit
Faulty fuel volume control actuator (stuck or open coil)
Short to voltage or ground on the control or return circuit
Poor or missing ground at actuator or ECM

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Engine runs rough, reduced power or poor throttle response
Hard starting or extended cranking
Reduced fuel economy and increased emissions
Possible limp-home mode or reduced engine torque

What to check

Read and record freeze-frame and full status with a professional scan tool
Verify DTC P0001 is current vs stored; check for related codes
Perform a visual inspection of wiring and connectors at the actuator, fuel rail area and ECM
Check fuses and relays related to fuel control circuits
Back-probe actuator connector and measure voltage/ground with key ON and while commanding from scan tool
Perform continuity and resistance checks between actuator pins and ECM connector

Signal parameters

Actuator control: commanded by ECM — typically a switched/grounded control or PWM duty-cycle signal (0–12 V range depending on design)
Actuator coil resistance: nominal coil resistance varies by design; typical solenoid coils commonly read from ~5 to 50 ohms (consult vehicle service data)
Supply voltage at actuator: near battery voltage with key ON (approx. 11–14 V)
Ground reference: close to 0 V; voltage drop under load should be minimal

Diagnostic algorithm

Connect a capable scan tool; record freeze-frame and read related codes. Clear code and attempt to re-create.
Visually inspect actuator connector, pins, wiring harness for damage, corrosion, or water ingress.
Check fuses and relays for the fuel control circuit; replace if blown or intermittent.
With connector disconnected, measure coil resistance across actuator terminals and compare to service spec. An open or infinite reading indicates a defective actuator.
Back-probe the actuator connector with key ON; verify battery voltage on supply pin and a valid ground or control signal on control pin.
Command the actuator using a scan tool (if supported) while monitoring voltage/command signal. Look for expected PWM or switching activity and corresponding response.
Perform continuity and resistance tests from the actuator connector pins to the ECM connector pins; check for shorts to voltage/ground.
Wiggle test wiring while monitoring live data to identify intermittent opens.
If wiring and actuator check good but no proper control signal from ECM, inspect ECM connector for damage and consider bench-testing or replacement per manufacturer guidance.
After repairs, clear DTCs and perform road test to confirm fault does not return.

Likely causes

Disconnected or corroded connector at the fuel volume actuator
Broken wire in the harness between actuator and ECM (frequent at flex points)
Defective actuator coil or internal open circuit
Blown fuse feeding actuator circuit
ECM driver failure (less common)

Fault status

⚠️ Status

Open circuit detected in fuel airbag volume control circuit. ECM logged P0001 and has disabled proper actuator control. Further electrical and component checks required to isolate cause.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P0001 — Fuel airbag volume control - circuit / open