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 there's a problem with the electrical circuit that controls the special fuel injector for cylinder 4 in your engine. It's not getting enough power or signal.
The P22E6 code indicates a low voltage or poor signal condition in the control circuit for the alternative fuel injector on cylinder 4.
The alternative fuel injector control circuit for cylinder 4 is responsible for delivering the correct amount of alternative fuel (such as CNG or LPG) into the cylinder. A 'low' condition typically means insufficient voltage or a poor connection in the circuit, which can affect fuel delivery and engine performance.
• Check Engine Light (CEL) is on
• Reduced engine performance
• Engine misfires
• Poor fuel economy
• Faulty alternative fuel injector
• Wiring issues such as shorts or open circuits
• Poor electrical connections
• Faulty engine control module (ECM)
ECM: Engine Control Module, the computer that controls engine functions.
Injector: A device that sprays fuel into the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 4's fuel injector.
• Test the voltage and continuity of the injector circuit.
• Check the injector itself for faults.
• Repair or replace damaged wiring or connectors.
• Replace the faulty alternative fuel injector.
• Repair or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools (screwdrivers, pliers)
$150 - $500
Moderate
• Chevrolet Silverado
• Ford F-150
• Dodge Ram 1500
• Regularly inspect and maintain fuel system components.
• Ensure proper electrical connections.
• Use recommended fuel types and qualities.
Engine Performance
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Check your vehicle's warranty coverage for powertrain components.
This code is often associated with vehicles that use alternative fuels and may be more common in older models with high mileage.
Moderate – While the vehicle may still be drivable, it can lead to poor performance and increased emissions.
Driving with a malfunctioning injector may increase emissions and could be illegal in some regions.
• Engine running
• Alternative fuel system activated
The alternative fuel injector for cylinder 4 is located on the engine, typically near the intake manifold.
Q: Can I drive with a P22E6 code?
A: It's not recommended to drive with this code as it can lead to poor engine performance and potential damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance and ensuring good electrical connections can help prevent this issue.
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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.