Quick Answer
P0390 means: P0390 indicates a malfunction in the camshaft position sensor 'A' circuit.
Can I drive with P0390? Address immediately to avoid severe engine issues or failure.
Common Questions
What does P0390 mean and how does it affect my car?
The P0390 code signifies a malfunction with the camshaft position sensor 'A' circuit. This sensor is vital for the engine's timing and performance. If this sensor fails, it can lead to poor engine performance, reduced fuel efficiency, and increased emissions. Long-term neglect can cause more severe engine issues, affecting reliability and safety.
What are the most common causes of P0390 and how much does it cost to fix?
Common causes of P0390 include a faulty camshaft position sensor, damaged wiring, and oil contamination. Repair costs vary depending on the issue; sensor replacement typically ranges from $150 to $300, while wiring repairs may cost between $100 and $200.
Can I drive my car with P0390 or should I stop immediately?
Driving with a P0390 code is not advisable, as it can lead to engine stalling or failure. It's best to address this issue immediately to ensure safety and prevent further damage to the engine.
How can I diagnose P0390 myself using GeekOBD APP?
To diagnose P0390 using the GeekOBD APP, connect the app to your vehicle’s OBD2 port and perform a full scan. Look for the P0390 code, then check freeze frame data to understand the conditions under which it occurred. You can also use the app to monitor real-time data from the camshaft position sensor.
What vehicles are most commonly affected by P0390?
Commonly affected vehicles include the 2011-2019 Ford F-150, 2012-2016 Honda Civic, and many other vehicles equipped with similar engine configurations. Always check for any manufacturer recalls or technical service bulletins related to this code.
How can I prevent P0390 from happening again?
To prevent P0390 from recurring, ensure regular maintenance such as oil changes and keep an eye on engine performance. Inspect wiring and connectors for any damage, and consider using high-quality engine oil to minimize contamination.
What is P0390?
The P0390 diagnostic trouble code indicates a problem with the camshaft position sensor 'A' circuit, specifically relating to range or performance. The camshaft position sensor is crucial for the engine management system as it helps determine the position of the camshaft relative to the crankshaft. This information is used by the engine control unit (ECU) to optimize fuel injection and ignition timing. When this code is triggered, it often means that the sensor is malfunctioning, the circuit is open or shorted, or the signal from the sensor is out of range. Drivers may notice various symptoms, such as a decrease in engine performance, rough idling, or even stalling. If not addressed promptly, this issue can lead to more significant engine problems and decreased fuel efficiency. The most common vehicles affected by this code include the Ford F-150 from 2011 to 2019 and Honda Civic models from 2012 to 2016. Ignoring this code can lead to poor engine performance and increased emissions, making timely diagnosis and repair essential.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0390 is present:
- Check engine light stays on constantly, indicating an issue with the camshaft position sensor.
- Engine hesitates during acceleration, leading to a lack of power and responsiveness.
- Rough idling can be felt with vibrations noticeable in the cabin, suggesting timing issues.
- Decreased fuel economy by 10-15%, causing higher fuel expenses for the driver.
- Engine may stall unexpectedly, especially at low speeds, posing safety risks.
Possible Causes
Most common causes of P0390 (ordered by frequency):
- A faulty camshaft position sensor is the most common cause of the P0390 code, occurring in approximately 70% of cases. This can result from wear and tear or exposure to heat and oil.
- Damaged wiring or poor connections in the sensor circuit can also trigger this code. Checking for frayed wires or corrosion is essential.
- Oil contamination can affect sensor performance, so ensuring regular oil changes can help prevent this issue.
- Less common but serious causes include a malfunctioning engine control module (ECM) that fails to interpret the sensor signal correctly, requiring professional diagnostics.
- A rare cause might be an issue with the timing belt or chain, which can disrupt the cam timing and lead to erroneous sensor readings.
P0390 Repair Costs
Cost Breakdown by Repair Type
Camshaft Position Sensor Replacement
Replacing the faulty camshaft position sensor with a new OEM or aftermarket part.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring or connectors in the sensor circuit.
- Total: $100 - $200
- Success rate: 80%
Money-Saving Tips for P0390
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0390 Diagnosis Process
Follow these systematic steps to accurately diagnose P0390. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the camshaft position sensor and its circuit (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the camshaft position sensor and its circuit (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for reoccurrence of the code (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for reoccurrence of the code (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: 2015 Ford F-150 Camshaft Position Sensor Replacement
Vehicle: 2015 Ford F-150, 65,000 miles
Problem: Customer reported the check engine light was illuminated and engine performance was sluggish.
Diagnosis: Performed an OBD2 scan and confirmed the P0390 code. Inspected the camshaft position sensor and identified it as faulty.
Solution: Replaced the camshaft position sensor and cleared the codes. Conducted a road test to verify proper operation.
Cost: $225 (includes parts and labor)
Result: After the repair, the vehicle ran smoothly, and the check engine light did not reappear.
Case Study 2: 2013 Honda Civic Wiring Repair
Vehicle: 2013 Honda Civic, 80,000 miles
Problem: Customer experienced engine stalling and rough idling with a persistent check engine light.
Diagnosis: Scanned for codes and found P0390. Inspected the wiring harness, revealing frayed wires affecting the sensor's performance.
Solution: Repaired the damaged wiring and secured the connections. Cleared codes and performed a function test.
Cost: $150 (repair cost for wiring)
Result: The vehicle idled smoothly post-repair, and no further codes appeared during the follow-up.