Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the special fuel injector for cylinder 8 in your car. It's not working right, like a toy that won't turn on because its batteries are loose.
The engine control module (ECM) has detected an issue with the alternative fuel injector circuit for cylinder 8. The signal is not within the expected range.
P22F8 indicates a malfunction in the control circuit of the alternative fuel injector for cylinder 8. This could involve electrical issues such as wiring problems, connector issues, or a faulty injector that prevents the ECM from controlling the fuel flow properly.
• Check Engine Light is on
• Engine misfire
• Reduced fuel efficiency
• Rough engine idle
• Faulty alternative fuel injector
• Wiring issues in the injector circuit
• Poor electrical connections
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 8's injector.
• Test the alternative fuel injector for proper operation.
• Check the ECM for faults.
• Repair or replace damaged wiring or connectors.
• Replace the faulty alternative fuel injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Chevrolet Silverado
• GMC Sierra
• Ford F-150
• Regular maintenance and inspection of fuel injectors.
• Ensure electrical connections are secure.
• Use high-quality fuel.
Engine Performance
• Avoid driving aggressively until the issue is resolved.
• Get the vehicle checked by a professional mechanic.
Check with your vehicle manufacturer for specific warranty coverage related to fuel injectors.
This code is relatively uncommon and often associated with vehicles using alternative fuels.
Moderate – It should be addressed soon to prevent further engine issues.
Driving with this issue may lead to increased emissions and reduced fuel efficiency.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The alternative fuel injector for cylinder 8 is located on the engine block, near the corresponding cylinder.
Q: Can I drive my car with a P22F8 code?
A: It's possible, but not recommended as it may cause further engine damage.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code after repairs are complete.
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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.