P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

P0342 means the ECU is reading a voltage on the camshaft position sensor signal circuit that is lower than the expected range, usually because the signal wire is shorted to ground, the sensor has failed, or the connector has lost contact. On most modern engines the camshaft signal is essential for sequential fuel injection and for VVT control; without it the engine may still run on crankshaft signal alone but with degraded performance.

P0342 is a ignition-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0342 and illuminates the check engine light.

If your vehicle has triggered P0342, you may notice one or more of these symptoms:

• Hard starting or extended cranking
• Engine stalls intermittently, especially when warm
• Reduced power and possible limp mode
• Rough idle
• Check engine light on

Here are the most common causes of P0342, ranked by how likely they are to be the culprit:

No - address this immediately. Without a valid camshaft position signal the ECU loses the ability to time fuel injection precisely and may go into limp mode. Hard starting and stalling are likely. Have the vehicle diagnosed before extended driving.

Follow these steps to pinpoint the root cause of P0342:

1. Read freeze-frame data and note whether the code is triggered at crank, idle, or during warm operation
2. Locate the camshaft position sensor and inspect for oil weeping around the sensor body or connector. Oil intrusion is a strong indicator of cam cover gasket failure
3. Unplug the sensor and measure resistance across its terminals if it is a magnetic pickup, or check the 5 V reference and ground pins for a Hall-effect sensor
4. Measure resistance from the signal wire to chassis ground with the sensor unplugged. A near-zero reading confirms a wiring short to ground
5. After replacing the sensor or repairing wiring, clear codes and verify the cam-to-crank correlation in live data

Repair costs for P0342 vary depending on the root cause and your vehicle. Here are typical estimates:

P0342 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:

These codes are often seen alongside P0342 or indicate related issues: