P052B

Code

LAND ROVER P — Powertrain

Cold Start Camshaft Position Timing with excessive delay (bank 1)

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 20 EN: 40 RU: 25

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Page language: EN

Causes

Faulty VVT (variable valve timing) oil control valve / solenoid
Low engine oil level, degraded oil, or wrong oil viscosity
Restricted or clogged oil passages to the cam phaser
Weak oil pump or low oil pressure
Stuck or failed camshaft phaser / actuator
Stretched timing chain or worn timing components

Symptoms

Malfunction Indicator Lamp (MIL) / check engine light ON
Rough or unstable idle during cold start
Hard starting or extended cranking at cold start
Reduced low‑end torque or sluggish acceleration until engine warms
Increased fuel consumption and emissions during warm‑up

What to check

Read and record trouble codes and freeze frame data
Check engine oil level, condition and correct viscosity for temperature
Inspect for recent oil change with incorrect oil or contamination
Scan live data: commanded vs actual camshaft angle, camshaft sensor waveform, oil temperature, RPM
Command VVT solenoid with a diagnostic tool and observe response (actual cam change)
Measure VVT solenoid resistance and check for short/open and supply/ground power

Signal parameters

Actual camshaft angle (degrees) vs commanded camshaft angle (degrees)
Camshaft position sensor waveform (voltage & tooth pattern)
Crankshaft position sensor waveform (for correlation)
VVT solenoid duty cycle / commanded PWM (%)
Engine oil temperature (°C) and engine coolant temperature
Engine speed (RPM) and engine load

Diagnostic algorithm

Retrieve codes, freeze frame and note conditions (oil temp, RPM) when fault occurred.
Check oil level and inspect oil condition; correct oil level and replace oil/filter if contaminated or wrong viscosity.
Clear codes and perform a cold-start test while monitoring live data: commanded vs actual cam angle, oil temp and RPM.
Visually inspect wiring and connectors for VVT solenoid and cam/crank sensors; repair any damage.
Measure VVT solenoid electrical resistance; verify supply voltage and ground with key on. Command solenoid with scan tool and confirm cam movement in live data.
Use an oscilloscope to verify camshaft and crankshaft sensor signals and timing correlation; check for excessive timing deviation or intermittent signal.
Check oil pressure at cold start; if low, inspect oil pump, filter, and passages. Replace oil pump or clean passages as required.
If solenoid electrical and oil supply are good but cam does not follow command, inspect or remove phaser/timing components for mechanical seizure or wear; replace cam phaser/chain/tensioner as necessary.
After repairs, clear codes and perform multiple cold-start cycles to verify the fault does not reoccur. Re-check for any manufacturer software updates.

Likely causes

VVT oil control valve sticking or electrically failing
Oil contamination or incorrect oil causing slow VVT operation
Internal oil passage blockage or debris preventing phaser movement
Mechanical failure of the cam phaser (stuck or seized)
Low oil pressure at cold start due to pump, filter, or level issues
Faulty cam position sensor or poor signal preventing correct timing feedback

Fault status

⚠️ Status

Camshaft position timing (bank 1) delayed beyond allowable limit during cold start — VVT system did not achieve commanded timing.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 4.0 hours

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P052B — Cold Start Camshaft Position Timing with excessive delay (bank 1)