The P1064 trouble code is a manufacturer-specific diagnostic code that typically indicates an issue with the Cylinder 4 Oil Supply Solenoid Valve. This code is commonly found in certain Chrysler, Fiat, and Jeep vehicles equipped with MultiAir engine technology. When the Powertrain Control Module (PCM) detects that the Cylinder 4 Oil Supply Solenoid Valve is stuck or not functioning properly, it triggers the P1064 code and illuminates the Check Engine Light.
| P1064 Code Meaning | P1064 Code Common Causes |
|---|---|
| Cylinder 4 Oil Supply Solenoid Valve Stuck | Faulty Variable Valve Actuator (VVA) Solenoid |
| MultiAir System Malfunction | Oil contamination or blockage in the solenoid |
| Engine Control Module (ECM) Detection of Valve Issue | Wiring harness problems or poor electrical connections |
| Improper Oil Flow to Cylinder 4 | Low engine oil level or incorrect oil viscosity |
| Variable Valve Timing System Fault | Malfunctioning Powertrain Control Module (PCM) |
Understanding the P1064 Code and MultiAir Technology
The P1064 code is closely related to the MultiAir system, an innovative engine technology developed by Fiat and used in various Chrysler and Jeep models. To fully comprehend the implications of this code, it’s essential to understand how the MultiAir system operates.
MultiAir System Overview
MultiAir is an electro-hydraulic variable valve actuation technology that allows for precise control of air intake into the engine cylinders. This system replaces the traditional camshaft-driven intake valves with hydraulically actuated valves controlled by a solenoid for each cylinder. The Cylinder 4 Oil Supply Solenoid Valve, which is at the heart of the P1064 code, is a crucial component of this system.
Symptoms of P1064 Code
When the P1064 code is present, you may experience one or more of the following symptoms:
- Illuminated Check Engine Light
- Reduced engine performance or power
- Rough idle or engine hesitation
- Decreased fuel efficiency
- Engine misfires, particularly in cylinder 4
- Difficulty starting the engine
- Unusual engine noise, especially from the valve train
It’s important to note that in some cases, there may be no noticeable symptoms other than the Check Engine Light being on. However, addressing the issue promptly is crucial to prevent potential damage to the engine or further performance degradation.
Diagnosing the P1064 Code
Proper diagnosis of the P1064 code requires a systematic approach and may necessitate specialized tools. Here’s a step-by-step guide for diagnosing the issue:
- Verify the code: Use an OBD-II scanner to confirm the presence of the P1064 code and check for any additional related codes.
- Check engine oil: Ensure the engine oil level is correct and the oil is clean. Low oil levels or contaminated oil can affect solenoid operation.
- Inspect wiring and connections: Examine the wiring harness and connectors related to the Cylinder 4 Oil Supply Solenoid Valve for any signs of damage, corrosion, or loose connections.
- Test the solenoid valve: Using a multimeter, measure the resistance of the Cylinder 4 Oil Supply Solenoid Valve. Compare the readings to the manufacturer’s specifications, which can typically be found in the vehicle’s service manual.
- Check power and ground: Verify that the solenoid valve is receiving proper power and ground signals. Use a test light or multimeter to check the voltage at the solenoid connector.
- Actuate the solenoid valve: If possible, use a scan tool to command the solenoid valve on and off. Listen for an audible click to confirm operation. If no click is heard, the solenoid may be stuck or faulty.
- Inspect the Engine Control Module (ECM): If all previous steps are normal, there may be an issue with the ECM itself. Professional diagnosis may be required at this point.
Warning: Some of these diagnostic steps may require advanced knowledge and specialized tools. If you’re not comfortable performing these tests, it’s best to consult a professional mechanic.
Common Causes and Solutions for P1064 Code
1. Faulty Variable Valve Actuator (VVA) Solenoid
The most common cause of the P1064 code is a faulty Variable Valve Actuator Solenoid for cylinder 4. This solenoid controls the oil flow that actuates the intake valves.
Solution: Replace the faulty VVA solenoid. This typically involves:
- Locating the solenoid on the cylinder head
- Disconnecting the electrical connector
- Removing the mounting bolts
- Carefully extracting the old solenoid
- Installing the new solenoid
- Reconnecting the electrical connector
- Clearing the diagnostic trouble codes
Cost estimate: $150 – $300 for parts, plus 1-2 hours of labor.
2. Oil Contamination or Blockage
Oil contamination or blockage in the solenoid can cause it to stick, triggering the P1064 code.
Solution: Perform an oil change and flush the system:
- Drain the old oil and replace the oil filter
- Fill with the manufacturer-recommended oil
- Run the engine for a few minutes to circulate the new oil
- Clear the codes and test drive the vehicle
If the problem persists, the solenoid may need to be cleaned or replaced.
Cost estimate: $50 – $100 for an oil change, plus additional costs if solenoid cleaning or replacement is necessary.
3. Wiring Harness Problems or Poor Electrical Connections
Damaged wiring or loose connections can disrupt the electrical signals to the solenoid, causing the P1064 code.
Solution: Inspect and repair the wiring:
- Locate the wiring harness for the Cylinder 4 Oil Supply Solenoid Valve
- Check for any visible damage, fraying, or corrosion
- Repair or replace damaged wiring as necessary
- Ensure all connections are clean and tight
- Use dielectric grease on connections to prevent future corrosion
Cost estimate: $50 – $200, depending on the extent of repairs needed.
4. Low Engine Oil Level or Incorrect Oil Viscosity
Insufficient oil or oil with the wrong viscosity can affect the operation of the MultiAir system.
Solution: Maintain proper oil level and use the correct oil:
- Check the oil level and top up if necessary
- Ensure you’re using the manufacturer-recommended oil viscosity
- If in doubt, perform a complete oil change with the correct oil
Cost estimate: $50 – $100 for an oil change with the correct oil.
5. Malfunctioning Powertrain Control Module (PCM)
In rare cases, the P1064 code may be caused by a faulty PCM.
Solution: PCM testing and replacement:
- Have the PCM professionally tested
- If faulty, the PCM will need to be replaced and programmed
Cost estimate: $500 – $1000 or more, depending on the vehicle model and programming requirements.
Warning: PCM replacement should only be performed by a qualified professional, as improper installation or programming can cause severe issues with vehicle operation.
Preventing Future P1064 Codes
To minimize the risk of encountering the P1064 code in the future, consider the following preventive measures:
- Regular oil changes: Adhere to the manufacturer’s recommended oil change intervals and always use the specified oil type and viscosity.
- Use high-quality oil: Opt for high-quality synthetic oils that meet or exceed the manufacturer’s specifications.
- Address Check Engine Lights promptly: Don’t ignore warning lights, as minor issues can escalate into more serious problems if left unattended.
- Regular maintenance: Follow the vehicle’s maintenance schedule to ensure all systems are functioning correctly.
- Avoid short trips: Frequent short trips can prevent the engine from reaching optimal operating temperature, potentially leading to oil contamination.
- Consider oil additives: Some manufacturers recommend specific oil additives to help keep the MultiAir system clean and functioning properly. Consult your owner’s manual or a dealership for guidance.
In conclusion, the P1064 code, while specific to certain vehicle makes and models, can be a complex issue to diagnose and repair. While some causes can be addressed by DIY mechanics, others may require professional intervention. Always prioritize safety and consult a qualified technician if you’re unsure about any aspect of the diagnosis or repair process.
Frequently Asked Questions About P1064
- Can I drive my vehicle with the P1064 code present?
While the vehicle may still be drivable, it’s not recommended to continue driving with this code present. The issue can lead to reduced performance and potential engine damage if left unaddressed. - How urgent is it to fix the P1064 code?
It’s important to address this code as soon as possible. The MultiAir system is crucial for proper engine operation, and ignoring the issue could lead to more extensive and expensive repairs. - Will the P1064 code clear itself?
It’s unlikely that the P1064 code will clear itself. The underlying issue needs to be resolved, and then the code can be cleared using an OBD-II scanner. - Is the P1064 code covered under warranty?
If your vehicle is still under warranty, this repair may be covered. Check your warranty documentation or contact your local dealership for specific coverage information. - How does the P1064 code affect fuel economy?
The P1064 code can negatively impact fuel economy. The MultiAir system is designed to optimize engine efficiency, and when it’s not functioning correctly, fuel consumption may increase. - Can a P1064 code be caused by aftermarket modifications?
While less common, certain aftermarket modifications, especially those affecting the engine’s air intake or valve timing, could potentially trigger a P1064 code. Always ensure modifications are compatible with your vehicle’s systems. - How long does it typically take to repair a P1064 code issue?
Repair time can vary depending on the underlying cause. Simple fixes like an oil change might take an hour, while more complex repairs like solenoid replacement could take 2-3 hours or more. - Are there any specific tools required to diagnose a P1064 code?
While a basic OBD-II scanner can read the code, advanced diagnosis may require specialized tools like a professional-grade scan tool with live data capabilities or a multimeter for electrical testing.