OBD code P0391 indicates an issue with the camshaft position sensor circuit in the engine.
Symptoms include the engine light being on, lack of power, and potential engine stalling.
This is commonly caused by a faulty camshaft position sensor or related wiring issues.
It is a moderate concern that should be addressed promptly.
To fix it, inspect the sensor, wiring harness, and connectors for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the p0391 OBD Code
The vehicle may experience issues related to camshaft position sensor circuit range/performance.
- With OBD code P0391, the Engine Light will be ON.
- Lack of power may be experienced.
- The engine could stall unexpectedly.
Causes of the p0391 OBD Code
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Possible reasons for fault code P0391 include issues with the camshaft position sensor circuit.
- Causes: Faulty Camshaft Position Sensor.
- Camshaft Position Sensor harness is open or shorted.
- Camshaft Position Sensor circuit poor electrical connection.
- Faulty starter motor.
- Starting system circuit.
- Dead (Weak) battery.
Fixing Error Code p0391 Step By Step
Address the issue by inspecting the camshaft position sensor circuit for potential faults or damages.
- To fix OBDII code P0391, first, review the possible causes related to the camshaft position sensor B circuit range/performance issue.
- Visually examine the wiring harness and connectors associated with the camshaft position sensor.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no visible issues are found, consider replacing the camshaft position sensor B if necessary.
- Clear the fault codes using a scan tool and test drive the vehicle to verify if the issue has been resolved.
Cost Of Fixing p0391 Fault Code
Diagnosing and repairing fault code P0391 typically involves inspecting and potentially replacing the camshaft position sensor.
The cost to diagnose and fix OBD code P0391 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the repair needed.
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Details of the p0391 OBD Code
Fault code P0391 relates to an issue with the camshaft position sensor B circuit.
OBD code P0391 means that a camshaft position sensor B circuit is out of range or performance is not within specifications.
This code is triggered by the Engine Control Module (ECM) when it detects that the camshaft position sensor B signal is not matching the expected values.
The camshaft position sensor B is usually located on the cylinder head and monitors the position of the camshaft in relation to the crankshaft.
It provides crucial information to the ECM for proper fuel injection timing and ignition timing.
When the ECM detects that the camshaft position sensor B signal is erratic or out of range, it will trigger the P0391 fault code and illuminate the Check Engine Light on the dashboard.
This can lead to drivability issues, poor engine performance, and potential stalling.
Diagnosing and fixing the underlying cause of the P0391 code may involve checking the camshaft position sensor B for proper operation, inspecting the sensor wiring for any damage or loose connections, and verifying that the sensor is receiving the correct voltage and ground signals.
If the sensor itself is faulty, it may need to be replaced to resolve the issue.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing fault code P0391 related to camshaft position sensor B circuit range/performance.
To diagnose and fix OBDII code P0391, start by checking the wiring harness and connectors related to the camshaft position sensor B circuit.
Use a voltmeter to test for proper voltage levels and continuity.
Inspect the connector pins for any damage, corrosion, or poor connections.
Additionally, scan tools can help monitor the camshaft position sensor’s performance and signals.
If necessary, consider reprogramming or replacing the camshaft position sensor.
Remember to clear the fault code after making any repairs to see if the issue persists.
FAQ
Common symptoms of OBD code P0391 include Engine Light ON, lack of power, engine stall. Causes may be faulty camshaft sensor or wiring issues. Fix: Inspect and repair wiring/connectors.
OBD code P0391 is typically caused by a faulty camshaft position sensor, open/shorted sensor harness, poor electrical connection, faulty starter motor, or weak battery.
Diagnose and repair OBD code P0391 by checking the camshaft position sensor, its wiring, and connectors for faults. Inspect for damage or poor connections.
Wrap Up
If your check engine light is on and your vehicle is experiencing rough idling or stalling, you may be dealing with OBDII code P0391. This code typically indicates an issue with the camshaft position sensor A circuit on bank 2. Possible causes include a faulty camshaft position sensor, wiring problems, or a poor connection.
To address OBDII code P0391, start by inspecting the wiring harness and connectors related to the camshaft position sensor on bank 2. Look for any signs of damage, corrosion, or loose connections.
If no issues are found
