P054ACold Start B Camshaft Position Timing Over-Advanced Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Camshaft B is the exhaust camshaft. During catalyst heating after a cold start some engines set it to a specific position; CARB requires such commanded elements to be monitored with their own codes, separate from the normal cam codes. Ford watches the deviation with an averaged variance index for each direction; GM (Saab 9-4X V6) uses only the retard codes, above 6° for 1 s or 4 s cumulative, type B. The commonest cause is oil pressure building too slowly when cold. P054A means bank 1 was too far advanced. Mercedes (M276) traces it to slow oil pressure – 1 bar should be reached after about 3 s; Audi (Q5 3.2) and VW (Atlas 3.6 and 2.0 T) fixed it by software.
- What you may notice
- Check engine light on, usually without noticeable symptom
- Brief rattle on cold start
- Rough idle while warming up
- Likely causes
- LikelyOil pressure building too slowly when cold (oil level, viscosity, pick-up, pump)
- PossibleExhaust oil control valve sticking or screens clogged
- PossibleModule software (threshold too tight)
- RareCam phaser defective, locking pin
- RareTiming chain stretched or misassembled
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.