Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer thinks there's a problem with the signal going to one of the spark plugs. It's like when a light switch is turned on, but the light doesn't come on because there's too much electricity trying to get through.
The P035C code is triggered when the Engine Control Module (ECM) detects a high voltage condition in the ignition coil 'E' control circuit.
This code indicates that the ECM has detected a higher than normal voltage in the ignition coil 'E' control circuit. This could be due to a short to voltage, an open circuit, or a faulty ignition coil. The ignition coil is responsible for generating the spark needed to ignite the air/fuel mixture in the engine's cylinders.
• Check Engine Light illuminated
• Engine misfire
• Poor fuel economy
• Faulty ignition coil
• Wiring issues such as short to voltage or open circuit
• Faulty ECM
ECM: Engine Control Module
Ignition Coil: A component that converts the battery's voltage to a much higher voltage to create a spark in the spark plugs.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and related wiring for damage.
• Test the ignition coil for proper operation.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition system components.
• Ensure all electrical connections are secure.
• Perform routine maintenance as per the vehicle's schedule.
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional help if unsure about repairs.
Repairs may be covered under the vehicle's powertrain warranty if applicable.
This code has been associated with ignition coil issues in various vehicles over the years.
Moderate – While the vehicle may still operate, prolonged driving with this issue can lead to more serious problems.
Driving with an engine misfire can lead to increased emissions and potential damage to the catalytic converter.
• Engine running
• Vehicle in park or neutral
The ignition coil is typically located on top of the engine, attached to the spark plugs.
Q: Can I drive with a P035C code?
A: It's not recommended to drive for extended periods with this code, as it can lead to further engine damage.
Q: Is a P035C code serious?
A: Yes, it indicates an issue with the ignition system that should be addressed promptly.
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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
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
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.