Powertrain, generic (extended)

P25E5 "B" Camshaft Position Control Performance (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P25E5 reports that the exhaust camshaft actuator on bank 1 is controlled less precisely than intended: its angle lags, overshoots or oscillates around the target beyond calibrated limits, without a latch fault. It is the exhaust-side counterpart of P25DF and overlaps in meaning with P0014 and the slow-response code P000B; no manufacturer documents how P25E5 is told apart from them. CARB 13 CCR 1968.2 requires detection of missed targets and slow phasing for all VVT hardware. In a hydraulic phaser like those BorgWarner supplies for Hyundai's Gamma II, exhaust adjustment depends on cam torque pulses and on clean oil passages in the centre bolt valve, so oil condition and valve wear are the first checks. Drivers may notice unsteady idle, slightly reduced power or poorer economy.

Likely causes

Worn or dirty control valve for the bank 1 exhaust phaser
Degraded engine oil or a blocked oil filter
Noisy exhaust camshaft position signal making the angle look unstable

Symptoms

  • Check engine lamp on
  • Unsteady idle
  • Slightly reduced power or economy

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 b1oil control valvecam position sensor

Related codes

P25E3P25E4P25E8P0014P000B

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