Low, dirty or incorrect-grade engine oil, or oil sludge restricting the variable timing actuator; Faulty or sticking camshaft phaser (variable valve timing actuator); Faulty camshaft timing control solenoid or its wiring and connector; Blocked oil feed passage or clogged solenoid screen; Stretched timing chain or worn tensioner/guides causing incorrect cam timing; Faulty camshaft or crankshaft position sensor giving a false reading; Outdated ECU calibration where a manufacturer update is known to address the fault.

P054D

Cold Start B Camshaft Position Timing Over-Retarded Bank 2.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
4D: FaultThe specific fault in that area

What it means

P054D means the engine control unit has detected that the Bank 2 camshaft timing, for the 'B' camshaft, is over-retarded (later than commanded) during or just after a cold start. The ECU compares the actual camshaft position from the camshaft and crankshaft sensors against the target set for cold running. The 'B' camshaft is usually the exhaust cam, but the labelling varies by engine, so check the model-specific layout.

Symptoms

Check engine light on
Rough or unstable idle on cold start
Hesitation or reduced power until the engine warms up
Increased fuel consumption
Rattle or ticking noise from the top of the engine on start-up
Hard starting or extended cranking

Possible causes

Low, dirty or incorrect-grade engine oil, or oil sludge restricting the variable timing actuatorlikely
Faulty or sticking camshaft phaser (variable valve timing actuator)likely
Faulty camshaft timing control solenoid or its wiring and connectorpossible
Blocked oil feed passage or clogged solenoid screenpossible
Stretched timing chain or worn tensioner/guides causing incorrect cam timingpossible
Faulty camshaft or crankshaft position sensor giving a false readingrare
Outdated ECU calibration where a manufacturer update is known to address the faultrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, oil temperature and load when the fault set, and check for other cam timing or misfire codes
Check the engine oil level, condition and grade against the manufacturer specification
Inspect the Bank 2 timing solenoid and cam sensor wiring and connectors for damage, oil contamination, chafing and corrosion
Check live data for commanded versus actual cam angle on Bank 2 during a cold start and as the engine warms
Test the timing solenoid's resistance and operation against the manufacturer's figures, and check its screen for debris
Check oil pressure with a gauge if oil supply to the phaser is suspected
Check for timing chain stretch using live data, a rattle check on start-up, and a model-specific inspection
Check for any applicable manufacturer software updates or technical bulletins for the model

How to fix

Change the oil and filter to the correct grade and specification, and correct the oil level
Clean or replace the timing control solenoid and its filter screen
Repair or replace damaged wiring or connectors
Replace the faulty camshaft phaser or actuator
Replace the timing chain, tensioner and guides if worn or stretched, following the model-specific procedure
Replace a faulty camshaft or crankshaft position sensor, or apply an ECU calibration update if one is known to cover this fault

Can I keep driving?

Medium severity

Short drives are usually possible, but get it checked soon because poor oil supply or a worn timing chain can lead to engine damage. Avoid hard acceleration and high revs, and stop driving if you hear loud rattling or the oil warning light comes on.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.