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 is having trouble adjusting how much fuel is being sent to one of the engine's cylinders. It's like trying to balance a see-saw, but one side is stuck.
The engine control module (ECM) has detected that the fuel injector for cylinder 11 is operating at its minimum limit for offset learning, which means it can't adjust the fuel delivery properly.
The ECM uses fuel injector offset learning to adjust the amount of fuel delivered to each cylinder for optimal performance. When the offset learning reaches its minimum limit for a specific cylinder, it indicates that the ECM can no longer compensate for variations in fuel delivery, possibly due to injector clogging or malfunction.
• Engine misfire
• Poor fuel economy
• Check engine light on
• Clogged or dirty fuel injector
• Faulty fuel injector
• Fuel pressure issues
ECM: Engine Control Module
Fuel Injector: A device that sprays fuel into the engine's cylinders
• Use an OBD-II scanner to confirm the code.
• Inspect the fuel injector for cylinder 11 for clogs or damage.
• Check fuel pressure to ensure it is within specifications.
• Clean or replace the fuel injector for cylinder 11.
• Check and repair any fuel pressure issues.
• Reset the ECM and test drive the vehicle.
• OBD-II scanner
• Fuel pressure gauge
• Injector cleaning kit
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly clean fuel injectors.
• Use high-quality fuel.
• Perform regular maintenance checks.
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for accurate diagnosis.
Check with your vehicle manufacturer for warranty coverage on fuel injectors.
This code has been associated with vehicles that have higher mileage or inconsistent maintenance schedules.
Moderate – It should be addressed soon to prevent engine performance issues.
Ignoring this code could lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in idle or low-load conditions
The fuel injector for cylinder 11 is located on the engine block, typically on the side of the cylinder head.
Q: Can I drive with a P12DC code?
A: It's not recommended to drive with this code active, as it can cause further engine damage.
Q: How do I clear the P12DC code?
A: After repairs, use an OBD-II scanner to clear the code and reset the ECM.
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Universal · Digital multimeter
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Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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.