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 there's a problem with a part in your car that helps control fuel vapors. It's like a switch that isn't working right, and it can make your car act funny.
The P1145 code is triggered when the Engine Control Module (ECM) detects an electrical fault in the solenoid valve circuit responsible for managing fuel vapor losses.
The solenoid valve running losses circuit is part of the evaporative emissions control system. This system helps prevent fuel vapors from escaping into the atmosphere. The ECM monitors the circuit for proper operation and will set the P1145 code if it detects an electrical issue, such as an open or short circuit.
• Check Engine Light is on
• Poor fuel economy
• Failed emissions test
• Faulty solenoid valve
• Damaged wiring or connectors
• Faulty ECM
Solenoid Valve: An electromechanically operated valve used to control the flow of liquids or gases.
ECM: Engine Control Module, the computer that manages engine operations.
• Use an OBD-II scanner to verify the code
• Inspect the solenoid valve and its wiring for damage
• Test the solenoid valve for proper operation
• Replace the faulty solenoid valve
• Repair or replace damaged wiring or connectors
• Reprogram or replace the ECM if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Nissan Altima
• Infiniti QX4
• Nissan Pathfinder
• Regularly inspect and maintain the EVAP system
• Check for loose or damaged connectors
• Ensure proper fuel cap sealing
Sensor Issue
• Do not ignore the Check Engine Light
• Consult a professional mechanic if unsure
• Regularly maintain your vehicle's emission system
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with issues in vehicles with complex evaporative emission systems, particularly in models from the late 1990s to early 2000s.
Moderate – While the vehicle may still run, ignoring this code can lead to increased emissions and potential damage to the emissions system.
Driving with a malfunctioning emissions system can lead to increased pollution and may be illegal in some areas.
• Engine at operating temperature
• Vehicle in a well-ventilated area
The solenoid valve is typically located near the fuel tank or along the fuel vapor lines.
Q: Can I drive with a P1145 code?
A: While you can drive with this code, it is not recommended as it may lead to increased emissions and potential damage to the emissions system.
Q: How do I reset the P1145 code?
A: After repairing the issue, you can reset the code using an OBD-II scanner. If the problem persists, the Check Engine Light may come back on.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
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.