Camshaft Position Sensor Circuit High (Bank 2)
The P0393 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the camshaft position sensor on Bank 2 that is higher than the expected range. This sensor monitors the position of the camshaft relative to the crankshaft to optimize fuel injection and ignition timing. A high circuit condition typically points to a short to voltage, faulty sensor, or wiring issues. Bank 2 refers to the side of the engine opposite cylinder #1.
01. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded terminals
- ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced fuel economy
- Loss of engine power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the camshaft position sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Test the sensor's voltage reference and ground circuits with a multimeter.
Step 4: Check the sensor signal voltage while cranking; compare to manufacturer specs.
Step 5: If signal is high, disconnect sensor and check for voltage on signal wire; if present, repair short to voltage.
Step 6: Replace the camshaft position sensor if all wiring tests pass.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor engine performance, stalling, or increased emissions. You may be able to drive to a repair shop, but avoid heavy acceleration.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150 for a DIY sensor replacement. Professional labor may add $50-$100, totaling $100-$250.