P018D

Code

LAND ROVER P — Powertrain

Fuel Pressure Sensor B - High Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 25 EN: 67 RU: 39

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Page language: EN

Causes

Short to battery/ignition voltage on the sensor signal wire
Faulty fuel pressure sensor B (internal short or electronics failure)
Poor or corroded connector or pin making intermittent/high-voltage contact
Damaged wiring harness (chafing, exposed conductor touching power)
Faulty or missing sensor ground or ECM reference voltage problem
Actual abnormally high fuel rail pressure (rare) or stuck regulator

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Reduced engine power or entry into limp mode
Hard start, rough idle or stalling
Poor fuel economy or drivability issues
Possible stored multiple fuel system related codes
Fuel system may not regulate properly (acceleration hesitation)

What to check

Read freeze frame and live data with a scan tool; note fuel rail pressure and sensor voltage values
Verify battery voltage and power supply to sensor (usually ~5 V reference from ECM)
Inspect sensor connector and wiring for corrosion, heat damage, or pin push‑out
Backprobe signal, reference and ground terminals at the sensor; compare to expected values
Wiggle wiring harness/connector while watching live data to find intermittent faults
Check for continuity between sensor signal pin and ECM input pin, and to chassis ground

Signal parameters

Reference supply (ECM): typically 5 V ±0.25 V
Signal output (typical): approx. 0.5 V (low pressure) up to ~4.0–4.5 V (high pressure); exact curve depends on sensor
Fault condition: sensor signal voltage above the ECM's high threshold (varies by model)
Sensor ground: near 0 Ω to chassis ground when good

Diagnostic algorithm

Retrieve DTCs and freeze frame data; record current live fuel pressure and sensor voltages.
Visually inspect the fuel pressure sensor B connector, wiring and harness routing for damage, corrosion or heat damage. Repair obvious issues.
With ignition on (engine off), backprobe the sensor connector: verify reference voltage (≈5 V), sensor ground, and signal voltage. If signal reads high with engine off, suspect wiring short or sensor.
Wiggle test the harness and connector while monitoring signal voltage to find intermittent faults.
If reference or ground is missing/incorrect, trace and repair power/ground circuits to ECM (check fuses and related relays).
Check continuity between the sensor signal pin and the ECM input pin. If there is a short to battery voltage, isolate and repair the short.
If wiring and ECU connections test OK, remove sensor after relieving fuel pressure safely and bench test or replace the sensor with a known good unit.
If problem persists after sensor replacement, perform wiring repair or consider ECM input circuit test/replacement per manufacturer procedures.
After repairs clear codes, perform a road test and re-scan to confirm the fault is resolved.

Likely causes

Short to constant or switched battery voltage on the sensor signal circuit
Failed pressure sensor (most common single-component failure)
Corroded/loose connector at sensor or ECM
Open/poor sensor ground or poor 5 V reference from ECM
Wiring harness damage near the fuel rail or routing through engine bay

Fault status

⚠️ Status

Fuel Pressure Sensor B signal voltage above allowed threshold. ECM stored P018D and may restrict engine performance until the fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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P018D — Fuel Pressure Sensor B - High Circuit