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 noticed that cylinder number 4 isn't working properly when using a different type of fuel, like natural gas or ethanol. It's like when one of your friends isn't playing well in a team game.
The engine control module (ECM) has detected a misfire in cylinder 4 when the engine is running on an alternative fuel source.
The P2E5C code indicates that the ECM has detected irregular combustion in cylinder 4 when the vehicle is operating on an alternative fuel, such as compressed natural gas (CNG) or ethanol. This can be due to issues with fuel delivery, ignition, or mechanical problems within the cylinder.
• Check Engine Light is on
• Rough idling
• Poor fuel economy
• Loss of power
• Engine stalling
• Faulty spark plug or ignition coil for cylinder 4
• Fuel injector issues specific to alternative fuel
• Compression problems in cylinder 4
• Fuel quality issues
• ECM malfunction
ECM: Engine Control Module
CNG: Compressed Natural Gas
Misfire: Failure of the fuel in the cylinder to ignite properly
• Use an OBD-II scanner to confirm the code.
• Inspect the spark plug and ignition coil for cylinder 4.
• Check the fuel injector for cylinder 4.
• Perform a compression test on cylinder 4.
• Examine the alternative fuel system for issues.
• Replace faulty spark plug or ignition coil.
• Clean or replace the fuel injector.
• Repair any mechanical issues within cylinder 4.
• Ensure the alternative fuel is clean and of good quality.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Spark plug socket
• Compression tester
• Fuel injector cleaner
• Multimeter
$150 - $600
Moderate
• Chevrolet Impala Bi-Fuel
• Ford F-150 CNG
• Honda Civic Natural Gas
• Regular maintenance of ignition components
• Use high-quality alternative fuel
• Regular inspection of fuel injectors
Engine Performance
• Avoid driving aggressively until the issue is resolved.
• Switch to regular fuel if possible and see if the problem persists.
Check vehicle warranty for coverage on fuel system and ignition components.
This code is more common in vehicles that are designed to run on alternative fuels, as these systems can be more sensitive to fuel quality and component wear.
Moderate – Should be addressed soon to prevent further engine damage.
Driving with a misfire can cause increased emissions and potential engine damage. Address promptly to avoid legal and safety issues.
• Engine running on alternative fuel
• Vehicle at operating temperature
Cylinder 4 is typically located on the engine block, and its specific position can vary based on the engine layout.
Q: Can I drive my car with a P2E5C code?
A: It's not recommended to drive for extended periods with this code, as it can cause engine damage and increased emissions.
Q: Will using regular fuel clear the code?
A: Switching to regular fuel might help diagnose if the issue is fuel-related, but it won't clear the code. Repairs may still be necessary.
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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.