The P0391 trouble code is associated with the Camshaft Position Sensor “B” Circuit Range or Performance in Bank 2, indicating a range or performance issue with the circuit of the camshaft position sensor in the second bank.
P0391 Camshaft Position Sensor “B” Circuit Range/Performance (Bank 2)
Code symptoms P0391.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Irregular engine operation.
3. Poor fuel efficiency.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0391.
1. Range or performance issue in the camshaft position sensor B circuit in Bank 2.
2. Wiring or connection issues in the circuit.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0391.
1. Inspect and, if necessary, replace the malfunctioning camshaft position sensor B in Bank 2.
2. Check for any faults or damages in the wiring or connections of the circuit.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.