P0092

Code

LAND ROVER P — Powertrain

Fuel pressure regulator control - high circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 14 EN: 64 RU: 37

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Page language: EN

Causes

Open or shorted wiring in the fuel pressure regulator control circuit
Failed fuel pressure regulator (solenoid)
Poor or corroded connector or terminal at the regulator
Blown fuse or loss of reference/power supply to the circuit
Poor ground or chassis connection
ECM internal fault or stuck output

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Poor idle quality, rough running or stumbling under load
Reduced engine performance or limp-home behavior
Fuel smell or rich running (if regulator causes overpressure)
Possible hard start or extended cranking time
Inconsistent or erratic fuel rail pressure readings on scan tool

What to check

Read and record all stored codes and freeze frame data with a scan tool
Check battery voltage and charging system before electronic tests
Visually inspect regulator, connector and wiring for corrosion, damage, melted insulation or fluid intrusion
Check related fuses and power/ground circuits for continuity and proper voltage
Backprobe control and power pins at the regulator and observe voltage/duty with key ON and engine running (if safe)
Measure regulator coil resistance with connector disconnected (engine off)

Signal parameters

Typical supply/power to regulator: key ON ~12 V (verify on vehicle)
Control signal: PWM duty or voltage from ECM — varies 0%–100% duty or 0–12 V depending on system (expected to respond to commands, not remain stuck high)
Coil resistance (approximate): often 2–30 ohms — model dependent (measure at room temperature)
Expected fuel rail pressure response: pressure should change when regulator is commanded (see vehicle service data for exact kPa/bar/psi values)
Cranking/idle battery voltage should remain >11.5 V during tests

Diagnostic algorithm

Capture freeze frame and all related codes (P0091, P0093, P0087, P0190, etc.) and note engine conditions when fault set.
Verify battery voltage and good ground; poor supply can cause spurious signals.
Visually inspect regulator, connector and harness for corrosion, fuel contamination, melted insulation, or pin damage; repair visible faults.
With ignition OFF, disconnect regulator connector and measure coil resistance across regulator pins; compare to specification. If open or shorted, replace regulator.
Inspect fuse(s)/relay(s) for regulator supply circuit; verify constant 12 V at power pin with key ON.
Reconnect and backprobe regulator control wire; with key ON (engine off) measure control voltage. Start engine and observe control signal with oscilloscope or scan tool: verify PWM duty cycles change with commands and not stuck at high voltage/duty.
Perform a controlled actuator test using a scan tool (command regulator) while monitoring fuel rail pressure; if commanded change does not change pressure, suspect regulator or wiring.
If control wire is stuck high, isolate by disconnecting connector and measuring if voltage remains on harness — if voltage disappears when disconnected, suspect regulator; if voltage remains, suspect short to battery or ECM output stuck.
Check continuity to ground and look for short to battery between control wire and other circuits. Repair wiring as necessary.
If wiring and regulator check good, consider ECM driver fault; perform ECM bench tests or replacement only after verifying harness and component health.
After repairs, clear codes, perform relearn procedures if required, and road test to confirm repair. Note: relieve fuel pressure and follow safety protocols before removing components.

Likely causes

Short to battery voltage on regulator control/wiring (pin shorted to +12V)
Corroded or damaged connector causing intermittent high voltage reading
Failed regulator with internal short/coil malfunction
Blown or damaged fuse or relay feeding the regulator circuit
Damaged harness from heat, chaffing or previous repair exposing conductor
ECM output driver stuck high or damaged

Fault status

⚠️ Status

ECM detected fuel pressure regulator control circuit voltage/duty higher than allowed threshold. Fault stored when control signal exceeds expected range or is shorted to battery voltage. MIL may be set and drivability affected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P0092 — Fuel pressure regulator control - high circuit