P1391 Jeep Code - CMP or CKP Signal Intermittent Condition
Quick Answer
The Powertrain Control Module (PCM) monitors the Camshaft Position Sensor (CMP) Or Crankshaft Position Sensor (CKP) Signal. Common causes include Faulty Crankshaft Position Sensor (CKP), Crankshaft Position Sensor (CKP) harness is open or shorted, Crankshaft Position Sensor (CKP) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1391 Jeep indicates CMP or CKP Signal Intermittent Condition.
- Common causes
- Common causes include Faulty Crankshaft Position Sensor (CKP), Crankshaft Position Sensor (CKP) harness is open or shorted, Crankshaft Position Sensor (CKP) circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1391 Jeep Description
What are the Possible Causes of the DTC P1391 Jeep?
- Faulty Crankshaft Position Sensor (CKP)
- Crankshaft Position Sensor (CKP) harness is open or shorted
- Crankshaft Position Sensor (CKP) circuit poor electrical connection
- Timing belt or chain stretched or jumped
- Faulty Camshaft Position (CMP) Sensor
- Camshaft Position (CMP) Sensor harness is open or shorted
- Camshaft Position (CMP) Sensor circuit poor electrical connection.
How to Fix the DTC P1391 Jeep?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1391 Jeep code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1391 Jeep Code
1. What are the common symptoms of OBDII code P1391 in a Jeep related to CMP or CKP signal intermittent condition?
- Common symptoms include engine stalling, rough idling, misfires, and difficulty starting the vehicle.
2. What are the possible causes of OBDII code P1391 in a Jeep indicating a CMP or CKP signal intermittent condition?
- Potential causes include faulty camshaft or crankshaft position sensors, damaged wiring or connectors, issues with the timing belt or timing chain, or a problem with the engine control module (ECM).
3. How can I diagnose the CMP or CKP signal intermittent condition causing OBDII code P1391 in my Jeep?
- Diagnosing this issue typically involves using a scan tool to check for the specific fault code, inspecting the camshaft and crankshaft sensors for damage, testing the wiring and connectors for continuity, and verifying the timing belt or chain alignment.
4. Is it safe to continue driving my Jeep with OBDII code P1391 related to a CMP or CKP signal intermittent condition?
- It is not recommended to continue driving the vehicle with this code present, as it can lead to further engine damage or safety issues due to potential stalling or misfires.
5. Can I repair OBDII code P1391 in my Jeep caused by a CMP or CKP signal intermittent condition myself?
- While some DIY enthusiasts may be able to address this issue by replacing the faulty sensors or repairing wiring connections, it is advisable to seek professional help for an accurate diagnosis and proper repair.
6. Will resetting the OBDII code P1391 related to CMP or CKP signal intermittent condition make it go away permanently?
- Simply resetting the code will not fix the underlying issue causing the fault. It is crucial to identify and address the root cause of the problem to prevent the code from reoccurring.
7. How much does it typically cost to repair OBDII code P1391 indicating a CMP or CKP signal intermittent condition in a Jeep?
- The cost of repair can vary depending on the specific cause of the issue, but it may range from around $100 to $500 or more, including parts and labor.
8. Are there any preventive maintenance measures I can take to avoid OBDII code P1391 in my Jeep due to CMP or CKP signal intermittent condition?
- Regularly inspecting and replacing the camshaft and crankshaft position sensors as part of routine maintenance can help prevent issues that trigger this fault code.
9. Can extreme weather conditions or driving off-road contribute to triggering OBDII code P1391 related to a CMP or CKP signal intermittent condition in a Jeep?
- Yes, extreme temperatures or driving conditions can sometimes exacerbate sensor or wiring issues, leading to the intermittent signal problem associated with this fault code.
10. How long does it typically take a mechanic to diagnose and repair OBDII code P1391 in a Jeep caused by a CMP or CKP signal intermittent condition?
- The diagnosis and repair process can vary depending on the complexity of the issue, but it usually takes a few hours to a full day for a mechanic to complete the necessary steps to address the problem effectively.
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