Powertrain (Engine & Gearbox)Standard EOBD

P0394 - Camshaft Position Sensor B Circuit Intermittent (Bank 2)

Q: What are the symptoms of fault code P0394?

• Check Engine Light (MIL) illumination. • Long cranking time during start-up. • Engine hesitation or stumbling while driving. • Decreased engine performance and fuel efficiency. • Engine stalling at idle or stops. • Vehicle may enter 'Limp Mode'.

Q: What causes fault code P0394?

• Most likely: Loose connection or oxidized terminals in the camshaft sensor connector. • Likely: Failing camshaft position sensor (internal thermal failure). • Possible: Damaged wiring harness (chaffing against engine block or chassis). • Rare: Improperly installed or damaged reluctor wheel (tone ring) on the camshaft. • Rare: Excessive timing chain/belt play causing signal deviation.

Q: How do you fix fault code P0394?

STEP 1: Visually inspect the connector and wiring harness for Sensor B on Bank 2. Check for oil intrusion from valve cover leaks which often causes signal degradation. STEP 2: Use a multimeter to verify reference voltage (typically 5V or 12V) and a clean ground. Test sensor resistance against OEM specs. STEP 3: For intermittent issues, use an oscilloscope to monitor the waveform while 'wiggle testing' the harness. Look for dropouts or noise in the signal pattern. STEP 4: If wiring and power/ground are verified, replace the Camshaft Position Sensor. Clear codes and perform a road test. Some vehicles may require a 'Camshaft Position Variation Learn' procedure using a scan tool.

Last updated:1 February 2026

Related:Kamakselposisjonssensor (CMP), Veivakselposisjonssensor (CKP), VVT-solenoide, Motorstyreenhet (ECU/PCM), Registerkjede/Registerreim

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0300

Random or Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

P0394 is a diagnostic trouble code (DTC) indicating that the Engine Control Unit (ECU) has detected an intermittent or erratic signal from the Camshaft Position (CMP) sensor 'B' on Bank 2. Bank 2 is the side of the engine that does not contain cylinder #1. Sensor 'B' typically refers to the exhaust camshaft. Under SAE standards, the ECU monitors the frequency and voltage of the signal; if it falls outside of calibration parameters sporadically, the code is triggered. This signal is critical for fuel injection timing, ignition spark, and Variable Valve Timing (VVT) operations.

Possible Causes

Loose connection or oxidized terminals in the camshaft sensor connector.

Failing camshaft position sensor (internal thermal failure).

Damaged wiring harness (chaffing against engine block or chassis).

Improperly installed or damaged reluctor wheel (tone ring) on the camshaft.

Excessive timing chain/belt play causing signal deviation.

Symptoms

Check Engine Light (MIL) illumination.

Long cranking time during start-up.

Engine hesitation or stumbling while driving.

Decreased engine performance and fuel efficiency.

Engine stalling at idle or stops.

Vehicle may enter 'Limp Mode'.

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P0394 - Camshaft Position Sensor B Circuit Intermittent (Bank 2)

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P0394 - Camshaft Position Sensor B Circuit Intermittent (Bank 2)

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