Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that there's a problem with a part of the car that helps it run safely if something goes wrong. It's like a backup plan for the engine, and it's not working right now.
The VVL (Variable Valve Lift) system is designed to optimize engine performance. The limp home request circuit is a safety feature that allows the engine to run at reduced power if there's a problem. This code indicates a low voltage or signal issue in that circuit.
The P1002 code is triggered when the Engine Control Module (ECM) detects a low voltage or signal issue in the Variable Valve Lift (VVL) system's limp home request circuit. This circuit is responsible for signaling the ECM to switch the engine to a reduced power mode in case of a malfunction, ensuring the vehicle can still be driven to a safe location.
• Check Engine Light is on
• Reduced engine power
• Poor engine performance
• Faulty VVL solenoid
• Damaged wiring or connectors
• Malfunctioning ECM
VVL: Variable Valve Lift
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the VVL solenoid and related wiring for damage.
• Test the voltage and continuity of the limp home request circuit.
• Replace the faulty VVL solenoid.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Nissan Altima
• Infiniti G35
• Nissan Maxima
• Regular maintenance of the VVL system
• Routine inspection of engine wiring
• Timely ECM updates
Engine Performance
• Avoid driving at high speeds until repaired.
• Schedule a diagnostic check with a professional.
• Monitor for any changes in vehicle performance.
Check with your vehicle manufacturer for warranty coverage on engine components.
This code has been associated with vehicles using advanced VVL systems, particularly in models with higher mileage.
Moderate – It is advisable to address this issue soon to prevent potential engine damage.
Driving with reduced engine power can be hazardous in certain conditions. Ensure repairs are conducted by a qualified technician.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The VVL solenoid is typically located near the top of the engine, close to the valve cover.
Q: Can I drive with a P1002 code?
A: It's possible to drive, but the vehicle may have reduced power. It's best to get it checked as soon as possible.
Q: How do I reset the check engine light after fixing the issue?
A: You can use an OBD-II scanner to clear the code and reset the light. If the issue is resolved, the light should stay off.
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