Quick Answer
P064C means: DTC P064C indicates a voltage reference issue in the PCM circuit.
Can I drive with P064C? Immediate attention is recommended to prevent further engine issues.
Common Questions
What does P064C mean and how does it affect my car?
P064C indicates that there's a voltage reference issue affecting the PCM. This can lead to poor engine performance, reduced fuel efficiency, and other issues. It's crucial to address this to ensure your vehicle runs smoothly.
What are the most common causes of P064C and how much does it cost to fix?
Common causes of P064C include a faulty PCM, damaged wiring, or failing sensors. Repair costs can range from $100 for wiring repair to $1200 for a PCM replacement, depending on the issue.
Can I drive my car with P064C or should I stop immediately?
It's advisable to stop driving the vehicle if you notice severe performance issues or warning lights. Continuing to drive can lead to more extensive damage and costly repairs.
How can I diagnose P064C myself using GeekOBD APP?
Using the GeekOBD APP, you can read diagnostic codes, view freeze frame data, and monitor sensor readings. Start by scanning for codes and check the voltage readings on the PCM to identify anomalies.
What vehicles are most commonly affected by P064C?
P064C is frequently seen in 2011-2018 Ford F-Series and 2014-2019 Chevrolet Silverado models, among others. Check for any recalls or Technical Service Bulletins (TSBs) related to your vehicle.
How can I prevent P064C from happening again?
To prevent P064C, ensure regular vehicle maintenance, inspect electrical connections, avoid aftermarket modifications, and replace aged sensors to maintain the integrity of the voltage reference system.
What is P064C?
The diagnostic trouble code (DTC) P064C indicates a problem with the voltage reference circuit for the Powertrain Control Module (PCM). This code specifically points to a range or performance issue with the voltage provided to the PCM from the vehicle's electrical system. When the PCM detects that the voltage is outside of normal parameters, it triggers this code. In practical terms, this can lead to a variety of performance issues, including poor engine performance, reduced fuel efficiency, and the check engine light illuminating on your dashboard. The PCM relies on accurate voltage readings to manage engine functions effectively, including fuel injection, ignition timing, and emissions control. If the voltage reference is faulty, the PCM may make erroneous decisions, causing the engine to run poorly or may even enter a failsafe mode to protect itself. Commonly affected vehicles include various models from Ford (especially the 2011-2018 F-Series) and Chevrolet (like the 2014-2019 Silverado). It's essential to address this code promptly, as ignoring it can lead to further engine damage and costly repairs down the line.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P064C is present:
- The check engine light stays on constantly, indicating that the vehicle's onboard diagnostics have identified a persistent issue.
- Engine hesitates during acceleration, causing a lack of response when pressing the gas pedal, which can be frustrating during driving.
- Fuel economy decreased by 10-15%, meaning you're spending more at the pump due to inefficient engine operation.
- Rough idling could be noticeable, with the engine vibrating more than usual while at a stop.
- Unusual engine noises may occur, such as knocking or pinging, which can indicate underlying problems caused by poor engine management.
Possible Causes
Most common causes of P064C (ordered by frequency):
- The most common cause of the P064C code is a faulty PCM or a voltage reference issue, which accounts for about 60% of cases. This can occur due to internal PCM failure or poor connections.
- Another potential cause is damaged wiring or connectors, which may disrupt the voltage supply to the PCM. This can happen due to wear and tear or exposure to the elements.
- A third cause could be a failing sensor that draws too much current, affecting the voltage reference. Regularly inspecting and replacing aged sensors can prevent this.
- Less common but serious causes include a weak battery or charging system, which can lead to overall electrical issues in the vehicle.
- A rare but possible cause is interference from aftermarket electronic devices or modifications that disrupt the vehicle's electrical system.
P064C Repair Costs
Cost Breakdown by Repair Type
PCM Replacement
Replacing the Powertrain Control Module if it is found to be faulty.
- Total: $500 - $1200
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors leading to the PCM.
- Total: $100 - $400
- Success rate: 75%
Money-Saving Tips for P064C
- 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 P064C Diagnosis Process
Follow these systematic steps to accurately diagnose P064C. 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, which could take around 5-10 minutes
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion, which could take around 5-10 minutes.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data, helping you understand the fault context; this may take 10-15 minutes
Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data, helping you understand the fault context; this may take 10-15 minutes.
Step 3: Step 3: Component testing - Using a multimeter or specific diagnostic tools, test the suspected components for proper voltage and resistance, which could take 20-30 minutes
Step 3: Component testing - Using a multimeter or specific diagnostic tools, test the suspected components for proper voltage and resistance, which could take 20-30 minutes.
Step 4: Step 4: System function test - After making any repairs, verify proper operation and clear codes to see if they return, taking about 10-15 minutes
Step 4: System function test - After making any repairs, verify proper operation and clear codes to see if they return, taking about 10-15 minutes.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful, which might take 15-20 minutes
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful, which might take 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: PCM Replacement on 2015 Ford F-150
Vehicle: 2015 Ford F-150, 75,000 miles
Problem: Customer reported engine hesitation and a persistent check engine light.
Diagnosis: After scanning with GeekOBD APP, P064C was retrieved. A visual inspection revealed corroded connectors leading to the PCM.
Solution: Replaced the damaged connectors and the PCM due to internal failure.
Cost: $800 (includes $600 for PCM and $200 for labor)
Result: Post-repair, the engine performed smoothly and the check engine light did not return.
Case Study 2: Wiring Repair on 2016 Chevrolet Silverado
Vehicle: 2016 Chevrolet Silverado, 50,000 miles
Problem: Vehicle exhibited rough idling and decreased fuel economy.
Diagnosis: Code P064C was detected using GeekOBD APP, and inspection found frayed wiring near the PCM.
Solution: Repaired the frayed wiring and secured all connections.
Cost: $200 (including parts and labor)
Result: Improved engine performance and fuel efficiency, with no further codes appearing.