Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that there's a problem with the electricity going to a part that helps control how the engine breathes. It's like if a toy car's battery was running low and it couldn't go as fast.
This code indicates that there is a low voltage supply to the Variable Valve Lift (VVL) control motor on bank 1 of the engine.
The P1056 code is triggered when the Engine Control Module (ECM) detects that the voltage supply to the VVL control motor is below the expected threshold. This motor is responsible for adjusting the valve lift, which optimizes engine performance and efficiency.
• Check Engine Light is on
• Reduced engine performance
• Poor fuel economy
• Engine may run rough or misfire
• Faulty VVL control motor
• Poor electrical connection to the VVL control motor
• Blown fuse or faulty relay
• Wiring issues such as shorts or opens in the circuit
• Faulty ECM
VVL: Variable Valve Lift
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the VVL control motor and its wiring for damage.
• Check the fuse and relay for the VVL control motor.
• Measure the voltage supply to the VVL motor.
• Test the ECM for proper function.
• Replace the VVL control motor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace any blown fuses or faulty relays.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Nissan Altima
• Nissan Maxima
• Infiniti G35
• Regularly inspect and maintain engine wiring.
• Ensure all electrical connections are secure.
• Perform routine engine diagnostics.
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle diagnosed by a professional if unsure.
• Regular maintenance can prevent such issues.
Check with the vehicle manufacturer for specific warranty coverage related to engine components.
This code is commonly associated with Nissan and Infiniti vehicles equipped with VVL systems, particularly in models from the early 2000s to mid-2010s.
Moderate – While the vehicle may still be drivable, performance and fuel efficiency are affected. Prompt repair is recommended.
Driving with a malfunctioning engine component may lead to increased emissions and potential safety hazards.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The VVL control motor is typically located on the engine, near the cylinder head of bank 1.
Q: Can I drive with a P1056 code?
A: While the car might still be drivable, it's not recommended as it can lead to further engine performance issues.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to poor engine performance, reduced fuel efficiency, and potential engine damage over time.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.