Camshaft Position Sensor Circuit Low (Bank 2)
The P0392 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the camshaft position sensor on Bank 2 (the side of the engine opposite cylinder #1). This sensor monitors the camshaft's position and speed, which is critical for proper fuel injection and ignition timing. A low circuit condition means the signal voltage is below the expected range, often due to a faulty sensor, wiring issues, or a poor electrical connection. This can cause drivability problems and may prevent the engine from starting.
1. Most Common Causes
- Faulty camshaft position sensor 'B' (internal short to ground)
- Signal circuit shorted to ground
- Damaged, corroded, or loose terminals in the sensor connector
- Open or short in the sensor's 5V reference or ground circuit
- Damaged or misaligned reluctor ring
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough or misfire
- Hard starting or no start condition
- Reduced engine power and fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0392 is present. Check for additional codes.
Step 2: Visually inspect the camshaft position sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's reference voltage (typically 5V) and ground at the connector using a multimeter.
Step 4: Measure the signal voltage from the sensor while cranking the engine; it should pulse between low and high voltage. If not, replace the sensor.
Step 5: If sensor tests OK, check for continuity and shorts in the wiring between the sensor and ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The engine may stall or fail to start, and driving could cause further damage or unsafe conditions.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement. Professional repair including diagnosis and labor may range from $150-$300.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.