P001C

Code

LAND ROVER P — Powertrain

Intake cam profile control circuit (A) high - Bank 1

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 18 EN: 32 RU: 26

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Page language: EN

Causes

Short to battery voltage on the intake cam profile control (A) circuit — Bank 1
Faulty intake cam profile actuator/solenoid (stuck or internally shorted)
Open or damaged wiring harness or connector (corrosion, broken pin)
Poor or missing ground
Contaminated or low engine oil causing actuator sticking
Faulty engine control module (ECM) or driver output

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine performance, hesitation or rough idle
Possible misfire symptoms or poor low-rpm response
Reduced fuel economy
Engine may enter limp mode or have reduced power
Unusual noise from the timing cover/cam area (in some cases)

What to check

Read and record freeze frame and permanent codes with a qualified scan tool; confirm P001C is current and not historic only
Visual inspection of wiring and connector at the intake cam profile actuator (Bank 1) for damage, corrosion, or loose pins
Check engine oil level and condition; very dirty or low oil can affect actuator operation
Backprobe actuator connector to measure voltage and ground with key ON engine OFF
Measure coil resistance of the actuator (with connector disconnected) and compare to spec
Check for continuity between actuator signal pin and ECM pin, and for shorts to battery or ground

Signal parameters

Expected battery supply voltage at actuator power feed: ~11–14.5 V (key ON/engine OFF)
Actuator control: PWM drive from ECM — duty cycle variable; frequency often 50–300 Hz depending on vehicle
Typical coil resistance (vehicle-dependent): commonly ~6–40 ohms (measure and compare to Land Rover spec)
A 'high' circuit DTC indicates voltage higher than expected on the control/signal line (possible short to battery or internal short)

Diagnostic algorithm

Verify code: Connect a scanner, confirm P001C and note freeze frame data and whether the code is current or history. Clear codes and perform a test drive to see if code returns.
Visual inspection: Inspect actuator connector, wiring harness route, and engine grounds for obvious damage, melted insulation, corrosion or oil contamination. Repair any obvious faults.
Check oil: Verify oil level and condition; correct level and change oil if heavily contaminated before continuing diagnostics.
Voltage/ground checks: Backprobe the actuator connector with key ON (engine OFF). Verify battery voltage at power feed and a good ground. If signal/control pin reads battery voltage (or erratic high voltage) with no command, suspect short to battery or stuck actuator.
Coil resistance and bench test: With harness disconnected, measure coil resistance at actuator. Compare to spec. If shorted/OL/out-of-spec, replace actuator. If within spec, perform an actuator operation test per manufacturer procedure (apply ground/voltage or use scan tool to actuate) to observe movement.
Wiring continuity and short test: With battery disconnected, check continuity between the actuator signal/power pins and the ECM connector. Check for shorts to battery or ground. Repair any open/shorted circuits.
Scan-tool actuation: Use a capable scan tool to command the cam profile actuator and monitor live data (position, duty cycle). Observe behavior while manipulating wiring (wiggle test) to reproduce the fault.
Swap/test ECM output: If wiring and actuator test good and issue persists, verify ECM output driver. As a last step, test or replace the ECM only after confirming wiring and actuator are fault-free and following manufacturer procedures.
Repair and verify: Repair/replace components as indicated (connector repair, wiring repair, actuator replacement). Clear codes and road-test to confirm the code does not return.

Likely causes

Damaged connector at the cam profile actuator (corrosion, bent pin)
Internal short in the cam profile actuator/solenoid coil
Wiring rubbed through and contacting battery/ignition voltage
Poor ground at engine/ECM chassis connection
Contaminated oil preventing actuator movement

Fault status

⚠️ Status

ECM detected an abnormally high voltage or signal on the Intake Cam Profile Control (A) circuit for Bank 1. This usually indicates a short to battery, internal actuator fault, wiring/connector issue, contaminated oil causing actuator binding, or less commonly ECM output driver fault. Replace or repair only after systematic verification.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P001C — Intake cam profile control circuit (A) high - Bank 1