P0390

Code

LAND ROVER P — Powertrain

Circuit B of the position sensor cames tree (bank 2)

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 11 EN: 15 RU: 13

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Page language: EN

Causes

Open or shorted wiring in camshaft sensor B circuit (bank 2)
Damaged, corroded or loose connector at the camshaft position sensor
Faulty camshaft position sensor B (bank 2)
Short to battery voltage or short to ground in the sensor harness
Oil/water intrusion at the sensor connector or harness damage (chafing, rodent)
PCM/ECM internal fault (less common)

Symptoms

Malfunction Indicator Lamp (MIL) illuminated (check engine light)
Rough idle, hesitation or misfire under load
Hard starting or no-start condition (in some cases)
Reduced engine power or limp-home mode
Irregular cam/crank correlation codes or poor fuel/ignition timing

What to check

Read freeze frame and live data with a scan tool; confirm P0390 and any related codes
Verify correct engine VIN/engine layout and identify bank 2 and camshaft B sensor location
Visually inspect sensor connector and wiring for damage, corrosion or oil/water intrusion
Backprobe sensor connector with ignition ON and while cranking; check reference voltage, signal and ground
Use an oscilloscope (preferred) or multimeter to observe signal waveform while cranking/running
Check continuity and resistance between sensor connector and PCM pin to rule out open/short

Signal parameters

Typical Hall-effect cam sensor: 0–5 V square wave signal; low ≈0 V, high ≈5 V; switching frequency increases with engine RPM
Reference supply to sensor typically ~5 V (confirm with factory data) and a reliable ground is required
Variable reluctance type (if used): AC sine/inductive voltage that increases with RPM; resistance and output depend on RPM — consult service manual
Crank/cam correlation pattern should match expected timing; missing or irregular pulses indicate sensor or timing issues

Diagnostic algorithm

Connect an advanced scan tool; record freeze frame and live PIDs. Note related codes (e.g., crank/cam correlation faults).
Confirm bank 2 / sensor B physical location on this engine before testing.
Visually inspect the sensor, connector and harness for damage, corrosion, oil or water. Repair obvious damage and retest.
With ignition ON (engine OFF) backprobe the sensor connector: verify reference voltage (≈5 V) and ground presence. If missing, trace power/ground to PCM.
Crank engine and observe signal at sensor with oscilloscope or DMM (frequency/voltage). Look for a clean switching waveform (Hall) or AC waveform (VR).
If no signal or abnormal waveform, check continuity between sensor signal pin and PCM; measure for short to ground or battery voltage.
Perform a wiggle test on the harness while monitoring the signal to catch intermittent opens/shorts.
If wiring and connectors are good, swap the suspect sensor with the same sensor from the opposite bank (if identical) or install a known-good sensor to verify sensor failure.
If the fault follows the sensor swap, replace the faulty sensor. If the fault remains, further inspect/repair harness or consider PCM fault and test/replace per factory procedures.
After repair, clear codes, retest and confirm no return under various operating conditions.

Likely causes

Broken/shorted wire between sensor and PCM
Corroded or pushed-out connector pins at sensor or PCM
Failed camshaft position sensor (internal electronics)
Intermittent connection caused by vibration-damaged harness
Short to power/ground at the sensor connector

Fault status

⚠️ Status

P0390 — Camshaft Position Sensor 'B' Circuit Bank 2: PCM detected an open, short, intermittent or invalid signal from the camshaft position sensor B circuit on bank 2. Verify sensor, wiring and connector before replacing control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours