P25DE"A" Camshaft Position - Unable to Achieve Locked Position (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P25DE is the reverse of P25DD: the intake cam phaser on bank 1 should return to its lock angle and let the pin engage, typically as the engine is about to stop or idles before an automatic stop, but the controller never sees the expected locked position. If the pin is not in place at the next start, the rotor can rattle against its stops and timing wanders until oil pressure takes over. No manufacturer documents P25DE publicly. On mid-lock designs such as BorgWarner's unit for the Hyundai Gamma II, the pin only drops in when the rotor passes the slot under oil-driven cam torque, so a worn pin bore, debris in the phaser or a control valve that cannot reach its lock range are prime candidates. CARB names a pin failing to move to its position among the mechanical faults a VVT monitor has to catch. Symptoms: rough or noisy starts.
- What you may notice
- Check engine lamp on
- Short rattle or knock from the timing drive right after starting
- Rough start or unsteady idle in the first seconds
- Likely causes
- LikelyDebris or wear in the phaser keeping the pin from dropping into its slot
- PossibleOil control valve sticking so the lock range of the spool is never reached
- PossibleAged or contaminated oil slowing the phaser at hot idle
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.