P25E1

Code

Generic P — Powertrain

A Camshaft Position - Unable to Achieve Locked Position Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 33 RU: 28

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Stuck or seized camshaft phaser/actuator (mechanical)
Faulty camshaft oil control valve (OCV) or solenoid
Low or contaminated engine oil reducing OCV/phaser operation
Timing chain/belt skipped teeth, stretched chain, or failed tensioner
Faulty camshaft position sensor or wiring/connectors on Bank 2
PCM/ECM software or internal fault

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine power, rough idle or hesitation
Possible misfire codes on Bank 2 cylinders
Unusual engine noise (rattle/tick) from timing area
Poor fuel economy or hard starting in extreme cases

What to check

Retrieve stored freeze frame and all related codes with a scan tool
Confirm oil level and general oil condition (sludging/metal particles)
Visually inspect wiring and connectors for cam sensor and OCV on Bank 2
Check battery voltage and PCM grounds to ensure proper power supply
Read live data: camshaft position sensor signal, commanded vs actual cam angle, OCV duty cycle/percent
Command OCV/cam phaser with a bidirectional scan tool and observe response

Signal parameters

Camshaft position sensor: typical 0–5 V square/sinusoidal signal (frequency increases with RPM)
Cam/Crank correlation: actual cam angle should follow ECM target within manufacturer tolerance (degrees)
OCV command: 0–100% duty cycle or PWM percentage (varies by vehicle)
OCV resistance: manufacturer-specific ohms; check service data
Engine speed range for diagnostics: idle through higher RPM to confirm behavior

Diagnostic algorithm

Read and record P25E1 and any related codes; capture freeze-frame data and live PID logs (cam position, crank position, OCV duty, oil temp).
Verify correct engine oil level and inspect oil condition. If oil is low or very dirty, correct and retest after oil change.
Visually inspect Bank 2 cam sensor and OCV connectors, wiring and PCM pins for damage, corrosion or poor connection; repair as needed.
Using a scan tool, command the Bank 2 OCV/cam phaser and observe if the commanded position changes actual cam angle. If no movement, test OCV electrical supply (power/ground) and coil resistance per service data.
If OCV is electrically OK but phaser won't move, inspect for mechanical seizure: remove valve cover/timing cover as required and check phaser for free movement and timing chain/belt condition and tensioner operation.
Check camshaft and crankshaft position sensor signals with an oscilloscope or high-quality scan tool to verify accurate waveforms and correlation. Look for slipped timing (cam retard/advance beyond spec) or missing teeth.
If mechanical timing slip or damaged phaser/chain/tensioner is found, repair/replace components (timing chain/belt service, tensioner, phaser, cam sprocket) and replace OCV if contaminated or faulty.
After repairs, clear codes and perform road test and live-data verification to ensure commanded and actual cam positions match and code does not return.
If no mechanical fault and electrical tests pass, consider ECM software update or replacement only after confirming all other possibilities.