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 the car's computer has detected a problem with the circuit that checks the glow plugs, which are like small heaters for the engine. It's saying the circuit is getting too much power.
The P037F code is triggered when the Engine Control Module (ECM) detects a high voltage condition in the glow plug sense circuit.
Glow plugs are used in diesel engines to heat the air in the cylinders to ensure proper starting and combustion. The glow plug sense circuit monitors the operation of the glow plugs. If the circuit senses a voltage higher than expected, it triggers the P037F code.
• Check Engine Light is on
• Difficulty starting the engine
• Rough engine idle
• Faulty glow plug
• Damaged or corroded wiring or connectors
• Faulty Engine Control Module (ECM)
Glow Plug: A device used to heat the air in a diesel engine to aid in starting.
Engine Control Module (ECM): The computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the glow plugs and related wiring for damage.
• Test the voltage in the glow plug circuit.
• Replace faulty glow plugs.
• Repair or replace damaged wiring or connectors.
• Replace the Engine Control Module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $500
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regularly inspect glow plugs and wiring.
• Perform routine maintenance checks.
• Use high-quality fuel to prevent deposits.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Do not ignore the problem as it can lead to starting issues.
• Consider regular maintenance to avoid such issues.
Check with your vehicle manufacturer; glow plug issues may be covered under powertrain warranty.
The P037F code has been observed in diesel engines, particularly in colder climates where glow plug function is critical.
Moderate – It should be addressed soon to ensure reliable engine starting and performance.
Driving with a faulty glow plug circuit can lead to increased emissions and potential engine damage.
• Engine at ambient temperature
• Key in the ON position without starting the engine
Glow plugs are located in the cylinder head of the engine, typically accessible from the top of the engine bay.
Q: Can I drive with a P037F code?
A: It's possible to drive with this code, but it may lead to starting issues and should be addressed promptly.
Q: How do I know if my glow plugs are bad?
A: Symptoms include difficulty starting the engine, especially in cold weather, and a rough idle.
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