Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that checks if the gas tank is leaking. It's like a switch isn't working right.
The P1451 code indicates a problem with the control circuit of the Diagnostic Module Tank Leakage (DM TL) solenoid, which is responsible for checking the fuel system for leaks.
The Diagnostic Module Tank Leakage (DM TL) system is part of the evaporative emission control system (EVAP) that prevents fuel vapors from escaping into the atmosphere. The DM TL solenoid is a component that helps seal and test the fuel system for leaks. A 'control circuit low' condition suggests that the electrical circuit controlling this solenoid is not receiving enough voltage or is grounded improperly.
• Check Engine Light is on
• Failed emissions test
• Noticeable fuel odor
• Faulty DM TL solenoid
• Wiring issues such as open or short circuits
• Faulty powertrain control module (PCM)
DM TL: Diagnostic Module Tank Leakage
EVAP: Evaporative Emission Control System
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the DM TL solenoid for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the DM TL solenoid if faulty.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• BMW 3 Series
• Regularly inspect and maintain the EVAP system.
• Ensure gas cap is properly sealed.
• Check for recalls related to the EVAP system.
Sensor Issue
• Have the vehicle inspected by a professional if you're not familiar with EVAP systems.
• Avoid overfilling the gas tank to prevent EVAP system issues.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been commonly reported in vehicles with higher mileage or those that experience frequent short trips.
Moderate – It should be addressed to prevent emissions issues but is not immediately critical.
Driving with a malfunctioning EVAP system may lead to increased emissions and could fail a vehicle inspection.
• Engine at operating temperature
• Vehicle parked on a level surface
The DM TL solenoid is usually located near the fuel tank or within the EVAP canister assembly.
Q: Can I drive with a P1451 code?
A: While the vehicle may still drive, it's best to fix the issue to avoid emissions problems.
Q: How do I reset the Check Engine Light after a repair?
A: Use an OBD-II scanner to clear the code after confirming the repair was successful.
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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.