P0391 - Camshaft Position Sensor B Range/Performance (Bank 2)

The ECM detected a camshaft position sensor B range/performance fault on bank 2.

Code Overview

The ECM detected a camshaft position sensor B range/performance fault on bank 2.

Common Causes

• Failed camshaft position sensor
• Damaged wiring or connector
• Timing issue affecting signal quality

Diagnostic Steps

1. Inspect the sensor connector and harness routing
2. Compare cam and crank signal behavior if supported
3. Check for timing-related faults before replacing parts

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.