P25E3

Code

Generic P — Powertrain

B Camshaft Position - Stuck In Locked Position Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 49 RU: 33

AI status

Completed

ready

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Page language: EN

Causes

Oil control valve (OCV) / cam phaser solenoid stuck, clogged, or failed
Low engine oil level, degraded oil, or contaminated oil passages
Restricted or clogged oil passages to the phaser (debris/sludge)
Camshaft phaser or actuator mechanically seized or damaged
Timing chain/belt jumped or damaged, or phaser-to-cam hardware failure
Faulty camshaft position sensor or damaged sensor tone ring

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Rough idle, hesitation, or misfire
Reduced engine power or limp mode
Hard starting or failure to start in severe cases
Poor fuel economy and increased emissions
Unusual engine noise if timing components are damaged

What to check

Retrieve freeze frame and full list of stored codes and pending codes
Check engine oil level, condition, and service history
Scan live data: commanded vs actual camshaft position for Bank 1, OCV duty cycle/position
Inspect oil control valve electrical connector, wiring, and measure solenoid resistance
Confirm oil pressure at idle and under load if applicable
Visually inspect timing components (timing cover removed if necessary) for jump or damage

Signal parameters

Commanded camshaft phase (degrees)
Actual camshaft position angle (degrees) or cam sensor I/O
Cam phaser/OCV commanded duty cycle (%) or voltage
OCV current draw (A) or resistance (Ω)
Engine oil pressure (kPa/psi)
Camshaft position sensor voltage/frequency

Diagnostic algorithm

Read and record all DTCs and freeze-frame data. Clear codes and attempt to reproduce conditions.
Check engine oil level and condition. If oil is low, contaminated, or overdue for change, top up or perform oil and filter change and retest.
Use a scan tool to monitor commanded vs actual camshaft position and OCV duty while cranking and at idle. Attempt active command of the OCV (where supported) and observe response.
Inspect OCV electrical connector and wiring for corrosion, damage, or poor contacts. Backprobe to verify proper supply voltage, ground, and control signal from ECM.
Measure OCV resistance and compare to specification. Remove and bench-test the OCV if suspect.
Check oil pressure at the gallery feeding the phaser or at a test port. Low oil pressure may prevent phaser movement.
If OCV and oil pressure are normal but phaser does not move, remove valve cover(s) to visually inspect phaser movement while commanding the actuator (follow safety and timing component service procedures).
Inspect timing chain/belt, phaser hardware, and camshaft for mechanical damage or seized components. Perform compression or leak-down test if mechanical damage is suspected.
Inspect camshaft position sensor signal waveform with oscilloscope if available; replace sensor if waveform is irregular.
Repair or replace defective parts (OCV, phaser/actuator, cam sensor, wiring). Reassemble, clear codes, and road-test. Consider PCM software update if manufacturer TSB applies.
If internal engine damage is found (seized phaser, damaged cam or timing components), plan for appropriate mechanical repairs (possible phaser replacement, timing system repair, or engine overhaul).