What causes fault code P054B?

• Most likely: Dirty or incorrect engine oil viscosity (especially in cold climates) • Likely: Failing VVT solenoid (Oil Control Valve) sticking when cold • Possible: Low oil pressure reaching the VVT phaser due to sludge or debris • Rare: Worn camshaft phaser unit or faulty camshaft position sensor

How do you fix fault code P054B?

STEP 1: Check oil level and condition. If the oil is dirty or has the wrong viscosity for ambient temperatures, perform an oil and filter change immediately. STEP 2: Inspect the Bank 2 VVT solenoid (Oil Control Valve). Measure resistance (typically 7-12 Ohms) and check for sludge in the solenoid screens. STEP 3: Use a scan tool to perform an active test of the solenoid. It should respond instantly with a change in engine RPM or timing values. STEP 4: If the solenoid is functional, the camshaft phaser (actuator) may be mechanically stuck and require replacement.

Powertrain (Engine & Gearbox)Standard EOBD

P054B - Cold Start B Camshaft Position Timing Over-Retarded (Bank 2)

Q: What are the symptoms of fault code P054B?

• Check Engine Light (MIL) illuminated • Rough idle immediately after cold start • Engine hesitation or stalling when cold • Increased emissions and reduced fuel economy

Last updated:1 February 2026

Related:VVT Solenoid (Oil Control Valve), Camshaft Phaser, Engine Oil / Oil Filter, Camshaft Position Sensor (CMP), Engine Control Module (ECM)

System

Powertrain (Engine & Gearbox)

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Technical Description

P054B is a generic OBD-II diagnostic trouble code indicating that the Engine Control Unit (ECU) has detected that the exhaust camshaft timing for Bank 2 is over-retarded during a cold start. The VVT (Variable Valve Timing) system is designed to adjust camshaft positions to reduce emissions while the engine is warming up. The ECU monitors the correlation between the camshaft position sensor and the crankshaft position sensor. If the camshaft fails to reach the commanded advanced position during the cold start phase, the code is stored. This is often related to oil viscosity, oil pressure, or mechanical sticking of the VVT phaser.

Possible Causes

Dirty or incorrect engine oil viscosity (especially in cold climates)

Failing VVT solenoid (Oil Control Valve) sticking when cold

Low oil pressure reaching the VVT phaser due to sludge or debris

Worn camshaft phaser unit or faulty camshaft position sensor

Symptoms

Check Engine Light (MIL) illuminated

Rough idle immediately after cold start

Engine hesitation or stalling when cold

Increased emissions and reduced fuel economy

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P054B - Cold Start B Camshaft Position Timing Over-Retarded (Bank 2)

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P054B - Cold Start B Camshaft Position Timing Over-Retarded (Bank 2)

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