Engine oil too low, wrong grade, degraded or contaminated, so the timing actuator responds slowly when cold; Faulty or sticking camshaft timing control solenoid (oil control valve) or a blocked screen in it; Worn, sticking or leaking camshaft phaser or actuator; Wiring, connector or earth fault in the solenoid or camshaft position sensor circuit; Faulty camshaft or crankshaft position sensor giving an inaccurate signal; Stretched timing chain or worn tensioner/guides, or a timing belt that has jumped a tooth; Outdated or faulty engine control unit software, where this is a known problem for the engine.

P05CC

Cold Start A Camshaft Position Timing Performance Bank 1.

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
CC: FaultThe specific fault in that area

What it means

P05CC means the engine control unit has found that the camshaft timing on bank 1 is not following the commanded position during the cold start strategy. The unit compares the actual camshaft position, from the camshaft and crankshaft sensor signals, with the target it requested from the variable timing actuator. If the difference is too large or the response is too slow, it sets the code. How the 'A' camshaft is defined (intake or exhaust) and the exact cold start strategy depend on the engine.

Symptoms

Check engine light on
Rough or unstable idle just after a cold start
Hesitation, poor throttle response or reduced power when cold
Rattling or ticking from the top of the engine on start-up
Higher fuel consumption
Hard starting or extended cranking in some cases

Possible causes

Engine oil too low, wrong grade, degraded or contaminated, so the timing actuator responds slowly when coldlikely
Faulty or sticking camshaft timing control solenoid (oil control valve) or a blocked screen in itlikely
Worn, sticking or leaking camshaft phaser or actuatorpossible
Wiring, connector or earth fault in the solenoid or camshaft position sensor circuitpossible
Faulty camshaft or crankshaft position sensor giving an inaccurate signalpossible
Stretched timing chain or worn tensioner/guides, or a timing belt that has jumped a toothpossible
Outdated or faulty engine control unit software, where this is a known problem for the enginerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine temperature, load and rpm when the code set, and look for related cam timing or sensor codes
Check the oil level and condition, and confirm the oil matches the specification for the engine; look for sludge or fuel dilution
Inspect the solenoid and camshaft and crankshaft sensor wiring and connectors for damage, oil contamination, corrosion or poor pins
Check the battery and charging voltage, as low voltage can upset solenoid response and sensor signals
With a scan tool, compare actual and commanded cam angle on a cold start and again when warm, and note any slow or stuck response
Command the timing solenoid through its range with a suitable tester, and measure its resistance and the circuit signals against the manufacturer's figures
Check the camshaft and crankshaft sensor waveforms for a clean, correct pattern and consistent correlation
Check the timing chain or belt condition and the correlation of the timing marks; the method depends on the engine

How to fix

Change the oil and filter to the correct specification, and correct the oil level
Clean or replace the camshaft timing control solenoid and its screen if it is sticking or faulty
Repair damaged wiring, connectors or earth connections in the affected circuits
Replace the camshaft or crankshaft position sensor if its signal is faulty
Replace the camshaft phaser or actuator, and the timing chain, tensioner and guides if worn or incorrectly timed
Update the engine control unit software only if the manufacturer lists an outdated calibration as a known cause for this engine

Can I keep driving?

Medium severity

Short, gentle journeys are usually possible, but get it checked soon, as timing faults can worsen and cause poor running or engine damage. Stop driving if you hear loud rattling, the engine runs very roughly or loses power badly.

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