Camshaft Position Sensor Circuit Intermittent (Bank 2)
The P0394 code indicates an intermittent signal from the camshaft position sensor on Bank 2 (the side of the engine opposite cylinder #1). This sensor monitors camshaft speed and position, which the engine control module (ECM) uses for fuel injection and ignition timing. An intermittent circuit fault can cause erratic engine performance, stalling, or difficulty starting. Common causes include a faulty sensor, damaged wiring, poor electrical connections, or issues with the sensor's reluctor ring.
01. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Damaged or corroded wiring/connectors
- Loose or poor electrical connection
- Malfunctioning ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced fuel economy and power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the Bank 2 camshaft sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter per manufacturer specs.
Step 4: Check for intermittent signal by wiggling wiring harness while monitoring scan tool data.
Step 5: Replace sensor if tests indicate failure; clear codes and test drive.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The intermittent signal can cause stalling or loss of power, which may be dangerous, especially in traffic.
How much does it cost to fix?▼
Typically $50 to $150 for parts and labor, depending on sensor cost and accessibility.