What causes fault code P055F?

• Most likely: Faulty oil pressure control solenoid stuck in the closed position • Likely: Defective engine oil pressure sensor (providing incorrect voltage feedback) • Possible: Wiring harness issue, such as short to voltage on the signal circuit • Rare: Physical blockage in the oil galleries or incorrect engine oil viscosity • Rare: Mechanical internal failure of the variable displacement oil pump

How do you fix fault code P055F?

STEP 1: Check oil level and condition. Ensure correct viscosity per OEM specs. Inspect connectors at the sensor and solenoid for corrosion or backing out pins. STEP 2: Use a scan tool to monitor live data for oil pressure. Compare the absolute pressure to a mechanical gauge if possible. If the sensor reports max pressure with engine off, the sensor or wiring is shorted. STEP 3: Voltage test the sensor. Verify 5V reference, ground, and signal return. Signal should be linear (typically 0.5V at 0 psi to 4.5V at max psi). STEP 4: Perform a bidirectional test on the oil pressure control solenoid. If the commanded duty cycle changes but pressure remains static, the solenoid is likely stuck. STEP 5: Replace defective sensor or solenoid as required.

Powertrain (Engine & Gearbox)Standard EOBD

P055F - Engine Oil Pressure Sensor/Switch Out of Range - High

Q: What are the symptoms of fault code P055F?

• Check engine light (MIL) illuminated • Dashboard message: 'Oil pressure high' or 'Oil service required' • Engine may enter 'Limp mode' (reduced power) • Unusual engine noise at high RPMs • No driveability symptoms other than the warning light

Last updated:1 February 2026

Related:Oil Pressure Sensor, Oljetrycksregleringsventil (Solenoid), Oil Pump, Engine Control Unit (ECU), Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

P055F is a generic OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM) has detected an oil pressure signal that is out of the calibrated range (high). In modern engines with variable displacement oil pumps, the ECM monitors actual oil pressure against a commanded setpoint. If the pressure remains significantly higher than requested for a predetermined period, this code is stored. This can be caused by a stuck oil pressure control solenoid, a restricted oil passage, or a failing pressure sensor providing incorrect high-voltage feedback.

Possible Causes

Faulty oil pressure control solenoid stuck in the closed position

Defective engine oil pressure sensor (providing incorrect voltage feedback)

Wiring harness issue, such as short to voltage on the signal circuit

Physical blockage in the oil galleries or incorrect engine oil viscosity

Mechanical internal failure of the variable displacement oil pump

Symptoms

Check engine light (MIL) illuminated

Dashboard message: 'Oil pressure high' or 'Oil service required'

Engine may enter 'Limp mode' (reduced power)

Unusual engine noise at high RPMs

No driveability symptoms other than the warning light

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P055F - Engine Oil Pressure Sensor/Switch Out of Range - High

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P055F - Engine Oil Pressure Sensor/Switch Out of Range - High

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