Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a part that checks for leaks in the fuel system, and it uses a small heater to help with this. This code means that the heater isn't working properly because it's not getting enough power.
The P1430 code is triggered when the Diagnostic Module Tank Leakage (DM TL) heater control circuit is detected to have low voltage, indicating a problem with the electrical supply to the heater.
The DM TL system is designed to detect leaks in the fuel system by using a pump and a heater. The heater helps ensure accurate readings by maintaining the proper temperature. A low circuit condition indicates insufficient voltage reaching the heater, which could be due to wiring issues, a faulty heater, or a problem with the control module.
• Check Engine Light is on
• Possible fuel smell
• Failed emissions test
• Faulty DM TL heater
• Damaged wiring or connectors in the heater circuit
• Faulty control module
DM TL: Diagnostic Module Tank Leakage
EVAP: Evaporative Emission Control System
• Scan the vehicle for additional codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the DM TL heater for proper resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty DM TL heater.
• Replace or reprogram the control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Regularly inspect and maintain the fuel system.
• Ensure electrical connections are clean and secure.
• Perform routine diagnostic checks.
Sensor Issue
• Address this issue promptly to avoid potential fuel leaks.
• Consult a professional mechanic if unsure about repairs.
Check with your vehicle manufacturer or dealer for warranty coverage on emissions-related components.
This code is commonly associated with BMW vehicles and has been reported in models from the early 2000s.
Moderate – While the vehicle may still operate, it's important to address this issue to ensure proper fuel system function and emissions compliance.
Driving with a malfunctioning fuel system component can lead to increased emissions and potential safety hazards.
• Vehicle at operating temperature
• Perform test in a well-ventilated area
The DM TL is typically located near the fuel tank or in the rear of the vehicle, often integrated with the EVAP system components.
Q: Can I drive my car with a P1430 code?
A: While you can drive the car, it's best to fix the issue soon to prevent potential fuel leaks and emissions problems.
Q: How can I prevent this code from appearing again?
A: Regular maintenance of the fuel system and ensuring all electrical connections are secure can help prevent this code.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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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.