Powertrain, generic (extended)

P25E8 "B" Camshaft Position Control Performance (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P25E8 is the last code of the locked-position block and covers the control quality of the bank 2 exhaust camshaft actuator: the module sees the angle wander from, overshoot or trail its setpoint more than allowed, while lock-related faults are absent. Older codes such as P0024 and P000D describe similar exhaust deviations on bank 2; which one a given calibration uses is not documented publicly by any manufacturer, so P25E8 should be read together with any accompanying cam codes and live phaser data. CARB 13 CCR 1968.2 demands that any VVT system be watched for wrong angles and sluggish travel. In hydraulic phasers like BorgWarner's torsional-assist units, oil viscosity, filter condition and wear in the valve or rotor seals decide how well the angle holds. Symptoms are usually subtle, such as uneven idle or higher fuel use.

Likely causes

Wear in the bank 2 exhaust control valve
Wrong oil viscosity or a clogged oil filter
Worn rotor seals inside the exhaust phaser

Symptoms

  • Check engine lamp on
  • Uneven idle
  • Higher fuel use

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cam phaser b b2oil control valvecam position sensor

Related codes

P25E6P25E7P25E5P0024P000D

References: law.cornell.edu, borgwarner.com.