Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the motor that controls how much air goes into the engine. It's like if a toy's battery is using too much power and might get too hot.
The VVL (Variable Valve Lift) system is responsible for adjusting the lift of the engine's valves for better performance and efficiency. This code indicates that the current in the control motor circuit is higher than expected, which might lead to overheating or failure.
The P1078 code is triggered when the Engine Control Module (ECM) detects a high current condition in the VVL overload protection control motor circuit. This can be due to a short circuit, a malfunctioning motor, or an issue with the ECM itself. The VVL system is part of the engine's variable valve timing mechanism, which optimizes performance and fuel efficiency by adjusting the valve lift according to the engine's needs.
• Check Engine Light is on
• Reduced engine performance
• Poor fuel economy
• Faulty VVL control motor
• Short circuit in the wiring
• Defective ECM
VVL: Variable Valve Lift, a system that adjusts the lift of the engine's valves.
ECM: Engine Control Module, the computer that controls various engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the VVL control motor for proper operation.
• Replace the faulty VVL control motor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$200 - $600
Moderate
• Honda Accord
• Acura TL
• Honda Civic
• Regular maintenance checks
• Ensure wiring harnesses are secure and undamaged
• Avoid harsh driving conditions that could strain the engine
Engine Performance
• Avoid driving at high speeds until the issue is resolved.
• Have the vehicle inspected by a professional mechanic.
Check if your vehicle's powertrain warranty covers the VVL system.
This code has been more commonly reported in vehicles with high mileage or those that have not undergone regular maintenance.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a malfunctioning VVL system can lead to increased emissions and may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The VVL control motor is typically located near the engine's cylinder head, connected to the valve train.
Q: Can I drive my car with a P1078 code?
A: It's not recommended to drive for long periods with this code, as it can lead to further engine damage.
Q: How can I reset the P1078 code?
A: You can reset the code with an OBD-II scanner, but it's important to fix the underlying issue first.
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