AutoCodes – Jeep – P0390 Jeep

P0390 Jeep Code - Camshaft Position Sensor Circuit Bank 2 Sensor 2

Quick Answer

The circuits of the Camshaft Position (CMP) Sensor include a 5-Volt reference circuit supplied by the Powertrain Control Module (PCM), a low reference circuit, and an output signal circuit. Common causes include Low engine oil, Faulty Camshaft Position (CMP) Sensor, Camshaft Position Sensor harness is open or shorted. 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: P0390 Jeep indicates Camshaft Position Sensor Circuit Bank 2 Sensor 2.
Common causes: Common causes include Low engine oil, Faulty Camshaft Position (CMP) Sensor, Camshaft Position Sensor harness is open or shorted.
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.

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Code Popularity 1,630

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 15, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0390 Jeep Description

The circuits of the Camshaft Position (CMP) Sensor include a 5-Volt reference circuit supplied by the Powertrain Control Module (PCM), a low reference circuit, and an output signal circuit. The CMP Sensor is a digital output integrated circuit sensing device that is internally magnetically biased. It detects changes in magnetic flux between the high and low points of a tone wheel connected to the camshaft. When each tooth on the tone wheel passes by the CMP Sensor, the sensor electronics use the resulting change in the magnetic field to generate a digital output pulse. The sensor produces a digital ON/OFF DC voltage pulse with a frequency that varies depending on the number of output pulses per revolution of the camshaft, corresponding to the pattern on the camshaft tone wheel. The speed of the camshaft determines the frequency of the CMP Sensor output. The PCM interprets the tooth pattern to determine the position of the camshaft. This information is then utilized to synchronize the engine's ignition timing and fuel injection events. Additionally, the PCM uses the CMP Sensor output data to ascertain the relative position of the camshaft to the Crankshaft, enabling control of the CMP Actuator if it is present.
The Diagnostic Trouble Code (DTC) will be set if, during cranking, at least 2.5 seconds have elapsed with a Crankshaft Position Sensor signal present but no Camshaft Position Sensor signal or with the engine running, the Camshaft Position Sensor signal is lost for at least 0.4 seconds with a Crankshaft Position Sensor signal present.

OBDII Code P0390 Jeep - Camshaft Position Sensor Circuit Bank 2 Sensor 2 - AutoCodes.com — P0390 Jeep Code - Camshaft Position Sensor Circuit Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0390 Jeep?

Low engine oil
Faulty Camshaft Position (CMP) Sensor
Camshaft Position Sensor harness is open or shorted
Camshaft Position Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)
Camshaft Tone Wheel loose/damaged or misaligned
Dead (Weak) battery

How to Fix the DTC P0390 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 does this mean?

Code Tech Notes

In the event of a failure in either the Crankshaft Position (CKP) Sensor or Camshaft Position (CMP) Sensor, the engine can still start. The Powertrain Control Module (PCM) is capable of determining the engine position and initiating startup based on one of these two inputs. However, there may be a small delay in starting as the PCM needs time to establish synchronization. If either the CKP or CMP Sensor signals are absent during engine cranking, a Diagnostic Trouble Code (DTC) is recorded, and the Malfunction Indicator Lamp (MIL) lights up.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0390 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0390 Jeep Code

1. What does OBDII code P0390 for a Jeep mean?

The code P0390 for a Jeep indicates a problem with the Camshaft Position Sensor Circuit for Bank 2 Sensor 2.

2. What are common symptoms of a P0390 code in a Jeep?

Common symptoms of a P0390 code in a Jeep include rough idling, stalling, poor acceleration, and difficulty starting the engine.

3. What are possible causes of a P0390 code in a Jeep?

Possible causes of a P0390 code in a Jeep include a faulty camshaft position sensor, wiring issues, a damaged sensor connector, or a problem with the sensor circuit.

4. How can I diagnose a P0390 code in my Jeep?

To diagnose a P0390 code in your Jeep, you can use an OBDII scanner to retrieve the specific code, visually inspect the camshaft position sensor and its wiring, and perform a continuity test on the sensor circuit.

5. Can I drive my Jeep with a P0390 code?

It is not recommended to drive your Jeep with a P0390 code, as it can lead to more serious engine issues and potential safety hazards. It is best to address the problem promptly.

6. How do I repair a P0390 code in my Jeep?

To repair a P0390 code in your Jeep, you may need to replace the camshaft position sensor, repair damaged wiring or connectors, or reset the engine control module after fixing the underlying issue.

7. Are there any DIY tips for fixing a P0390 code in a Jeep?

While some basic troubleshooting like checking connections and wiring can be done DIY, it is recommended to have a professional mechanic diagnose and repair a P0390 code to ensure proper resolution.

8. Is the P0390 code specific to Jeep vehicles?

The P0390 code is not specific to Jeep vehicles; it is a generic OBDII code that can appear in various makes and models, indicating a similar issue with the camshaft position sensor circuit.

9. Can a P0390 code cause other problems in my Jeep?

Yes, if left unresolved, a P0390 code can cause issues like poor fuel efficiency, engine misfires, and potential damage to other engine components over time.

10. How much does it cost to repair a P0390 code in a Jeep?

The cost to repair a P0390 code in a Jeep can vary depending on the specific underlying issue, parts needed, and labor costs. It is recommended to get quotes from different mechanics for an accurate estimate.