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 engine's computer has detected a problem with how well cylinder number 9 is working. It's like if one of the nine engines on a nine-engine plane isn't working as well as it should.
The engine control module (ECM) monitors the combustion process in each cylinder. If it detects a performance issue in cylinder 9, it triggers the P2351 code.
P2351 indicates that the ECM has identified a discrepancy in the combustion process of cylinder 9. This could be due to issues such as improper fuel-air mixture, ignition problems, or mechanical faults in the cylinder.
• Check Engine Light is on
• Rough engine idle
• Decreased fuel efficiency
• Faulty spark plug in cylinder 9
• Clogged fuel injector in cylinder 9
• Low compression in cylinder 9
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the spark plug and ignition coil for cylinder 9.
• Check the fuel injector for cylinder 9.
• Replace the spark plug for cylinder 9.
• Clean or replace the fuel injector for cylinder 9.
• Perform a compression test and repair any mechanical issues.
• OBD-II scanner
• Spark plug socket
• Fuel injector cleaner
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly replace spark plugs
• Use high-quality fuel
• Perform routine engine maintenance
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
Check with the vehicle manufacturer for warranty coverage on engine components.
P2351 is less common than other misfire codes and typically indicates a specific issue with cylinder 9.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfire can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in idle or under load conditions
Cylinder 9 is typically located at the rear of the engine on the passenger side in a V8 configuration.
Q: Can I drive with a P2351 code?
A: It's not recommended to drive for extended periods with this code, as it can cause further engine damage.
Q: What happens if I ignore the P2351 code?
A: Ignoring this code can lead to poor engine performance and increased fuel consumption.
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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.