Code
P1381
LAND ROVER
P — Powertrain
Variable camshaft timing advanced above, bank 1
Views:
UK: 18
EN: 27
RU: 21
AI status
Completed
Completed
100%
Causes
- Low or degraded engine oil (contaminated, incorrect grade, or low level)
- Faulty or sticking camshaft phaser/actuator on bank 1
- Faulty VVT/oil control valve (OCV) or solenoid (electrical or mechanically stuck)
- Wiring harness problem or poor connector (open, short, high resistance) to VVT solenoid or camshaft position sensor
- Faulty camshaft position sensor (CPS) or signal interference
- Stretched/incorrect timing chain, worn sprockets, or mechanical timing jump
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced engine power or poor acceleration
- Rough idle, hesitation, or misfire at some conditions
- Poor fuel economy and increased emissions
- Intermittent start/idle problems (if severe oil pressure loss)
- Possible limp-home mode depending on vehicle/ECM
What to check
- Read and record stored DTC(s) and freeze-frame/live-data parameters
- Confirm oil level, oil condition, and correct oil grade for the engine
- Inspect connectors and wiring at VVT solenoid(s) and camshaft position sensor for damage, corrosion, or poor contacts
- Monitor live data: commanded camshaft angle vs actual camshaft angle for bank 1 (look for large deviation or no movement)
- Perform an active test (command VVT solenoid ON/OFF) while observing cam angle and engine behavior
- Measure VVT solenoid electrical parameters (resistance, supply voltage, ground) with ignition off and key on respectively
Signal parameters
- Actual camshaft advance should closely follow commanded camshaft advance; typical allowable deviation in many systems ≈ ±2–6° (refer to OEM spec)
- VVT/oil control solenoid duty cycle: 0–100% (active tests will vary by command)
- VVT solenoid coil resistance (typical range for many systems): ~6–20 ohms — check OEM spec for exact value
- Camshaft position sensor output: square/sinusoidal waveform 0–5 V (or referenced to sensor type) with stable frequency proportional to RPM
- Engine oil pressure: generally should be above a low-idle threshold (manufacturer-specific); oil pressure should rise consistently with RPM; significant drop can prevent phaser operation
- Crank vs cam correlation: no large correlation error (P0016-type symptoms if timing has jumped)
Diagnostic algorithm
- Retrieve all diagnostic trouble codes, freeze-frame, and live data. Note if P1381 is accompanied by other cam/CRANK codes.
- Verify engine oil level and condition. If oil is low, top up and replace oil if dirty or overdue; clear code and retest.
- Visually inspect wiring and connectors for the bank 1 VVT solenoid and camshaft position sensor. Repair any damage or poor connections.
- With a scan tool, monitor commanded cam advance vs actual cam advance while varying engine speed and during an active VVT request. Document deviation.
- Command the VVT solenoid ON/OFF (active test) and observe change in actual cam angle. If the cam does not respond, suspect hydraulic/mechanical or electrical fault.
- Test VVT solenoid electrical characteristics: measure coil resistance, check supply voltage and ground while cranking/engine running and when commanded. Repair wiring or replace solenoid if out of spec.
- If solenoid and electricals are OK, check oil pressure at the engine (mechanical gauge) and inspect oil passages to the phaser. Low pressure or blocked passages require repair.
- If oil pressure and solenoid function are normal but cam angle does not change, inspect or remove phaser/chain system for mechanical seizure, excessive wear, or timing jump. Replace phaser/timing components as required.
- If camshaft position sensor waveform is noisy or inconsistent, test/replace the sensor and retest.
- After repairs, clear codes, perform a road test under various conditions, and recheck live data to confirm commanded vs actual cam timing is within specification. If intermittent, inspect for engine oil consumption/contamination or intermittent wiring faults.
- Safety note: follow manufacturer procedures for engine support, and isolate battery when working near electrical connectors if required.
Likely causes
- Low/contaminated engine oil preventing phaser movement
- Stuck or failed VVT/oil control valve (OCV)
- Mechanical phaser failure or timing chain/slippage
- Wiring/connector issue to VVT solenoid or camshaft position sensor
- Faulty camshaft position sensor
Fault status
Status
MIL illuminated. ECM has detected camshaft timing on bank 1 advanced beyond allowable range. VVT/phaser control fault — may affect drivability and emissions; may trigger limp mode depending on severity.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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