Camshaft Position Sensor A Circuit High Input (Bank 2)
The P0348 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 input can result from a faulty sensor, wiring issues, or a problem with the sensor's reference voltage or ground circuit.
1. Most Common Causes
- Short circuit in the CMP sensor wiring to the reference voltage (Vref) or battery positive (B+)
- Internal short circuit in the camshaft position sensor to the power supply circuit
- Excessive resistance or open circuit in the sensor ground (signal) wire
- Corroded, damaged, or moisture-contaminated CMP sensor connector or terminals
- Faulty camshaft position sensor
- Intermittent wiring harness failure due to chafing or excessive engine heat
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough or misfire
- Hard starting or stalling
- Reduced engine performance and fuel economy
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the camshaft position sensor connector and wiring for damage, corrosion, or shorts.
Step 3: Test the sensor's voltage supply (typically 5V reference) and ground circuits with a multimeter.
Step 4: Measure the sensor signal voltage while cranking the engine; compare to manufacturer specifications.
Step 5: If all circuits are okay, replace the camshaft position sensor on Bank 2.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the engine may run poorly, stall, or cause further damage. Limp mode may activate, limiting speed and performance.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150 for a DIY sensor replacement, or $150 to $300 if professionally installed, including parts and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.