Code result
P25DF
A Camshaft Position Control Performance Bank 1
Moderate severity
What it means
Camshaft phaser A on bank 1 follows the commanded angle too slowly, oscillates, or shows steady-state error outside tolerance. Closed-loop control of cam timing is degraded.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Oil control valve spool sticks under varnish
highOne of the most commonly reported causes for this code — check this first.
Stretched timing chain shifts cam reference
mediumA plausible cause — test and verify before replacing parts.
Wrong oil viscosity slows phaser response
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P25DF freeNo credit card required