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 electricity going to a group of fuel injectors in your car. It's like when a light bulb doesn't turn on because there's a problem with the wire or switch.
The P2149 code indicates that the Engine Control Module (ECM) has detected an open or short circuit in the supply voltage to a group of fuel injectors labeled as Group B.
The fuel injectors are responsible for delivering fuel to the engine. In some vehicles, they are grouped into circuits for efficient control. If the ECM detects that the supply voltage to one of these groups is not within the expected range, it will trigger the P2149 code. This could be due to a wiring issue, a faulty injector, or a problem with the ECM itself.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Faulty fuel injector
• Open or shorted wiring in the injector circuit
• Faulty Engine Control Module (ECM)
ECM: Engine Control Module, the computer that controls engine functions.
Fuel Injector: A component that sprays fuel into the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the injector group.
• Test the voltage and resistance of the injector circuit.
• Repair or replace damaged wiring or connectors.
• Replace faulty fuel injectors.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 to $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Dodge Ram
• Regularly inspect and maintain fuel injector wiring.
• Use quality fuel to prevent injector clogging.
• Perform periodic engine diagnostics.
Engine Performance
• Do not ignore the Check Engine Light.
• Have a professional inspect the vehicle if unsure.
• Regular maintenance can prevent such issues.
Check with your vehicle manufacturer for specific warranty coverage related to the fuel system.
This code has been more common in vehicles with higher mileage or those that have not had regular maintenance.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a malfunctioning fuel injector system can lead to increased emissions and potential safety hazards.
• Engine at operating temperature
• Vehicle in park or neutral
Fuel injectors are typically located on the engine, attached to the intake manifold.
Q: Can I drive with a P2149 code?
A: It's not recommended as it can lead to further engine issues and poor performance.
Q: How can I reset the Check Engine Light?
A: After repairs, use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.
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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.