P0391
Camshaft Position Sensor B Circuit Range/Performance Bank 2
P0391 is an OBD-II diagnostic trouble code meaning: Camshaft Position Sensor B Circuit Range/Performance Bank 2. Common causes: camshaft position sensor b malfunction, open or shorted wiring harness. Estimated repair cost: $33–167.
Symptoms
- Unstable engine operation
- Power reduction
- Increased fuel consumption
- Check Engine Light Illuminates
- Problems starting the engine
Causes
- Camshaft Position Sensor B Malfunction
- Open or shorted wiring harness
- Poor contact in the sensor connector
- Power or grounding problems
- Mechanical timing problems (chain, gears)
- Sensor contamination with metal shavings
How to Fix
- Check sensor parameters with a scanner
- Visually inspect the sensor and wiring harness
- Check the contacts in the sensor connector
- Measure the resistance and voltage of the sensor
- Replace sensor if necessary
- Check the condition of the timing chain and marks
Related codes
Error P0391 by Vehicle Brand
FAQ
What does the P0391 code mean?
P0391 is an OBD-II diagnostic trouble code that indicates: Camshaft Position Sensor B Circuit Range/Performance Bank 2
What causes a P0391 error code?
The most common causes of P0391 include: Camshaft Position Sensor B Malfunction; Open or shorted wiring harness; Poor contact in the sensor connector; Power or grounding problems.
How do I fix a P0391 diagnostic trouble code?
To fix P0391: Check sensor parameters with a scanner. Visually inspect the sensor and wiring harness. Check the contacts in the sensor connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0391?
Limited driving only, diagnose soon
How much does it cost to fix P0391?
The estimated repair cost for P0391 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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