Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer is having trouble with the fuel injector in cylinder 3, which is like a tiny squirt gun that sprays fuel into the engine. It's not working quite right, and the computer can't fix it on its own.
The engine control module (ECM) monitors the fuel injection pulse for each cylinder. If the pulse offset for cylinder 3 is outside the acceptable range, it triggers this code.
The P2B15 code indicates that the ECM has detected that the injection pulse offset for cylinder 3 has exceeded the learning limit. This means the ECM is unable to adjust the fuel injector pulse width to maintain optimal engine performance. This could be due to a malfunctioning injector, wiring issues, or a problem with the ECM itself.
• Check Engine Light is on
• Rough idling
• Decreased fuel efficiency
• Engine misfires
• Poor acceleration
• Faulty fuel injector in cylinder 3
• Wiring issues or poor connections
• Malfunctioning ECM
• Fuel pressure problems
• Injector control circuit 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 wiring and connections to the injector.
• Test the fuel injector for proper operation.
• Check the fuel pressure.
• Inspect the ECM for faults.
• Replace the faulty fuel injector.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• Ensure fuel pressure is within specifications.
• OBD-II scanner
• Multimeter
• Fuel pressure gauge
• Basic hand tools
$200 - $600
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly maintain the fuel system.
• Use high-quality fuel.
• Perform regular engine diagnostics.
Engine Performance
• Address the issue promptly to avoid further engine damage.
• Consult a professional mechanic if unsure about repairs.
Check vehicle warranty for coverage on fuel system components.
This code has been associated with fuel injector issues in vehicles with direct fuel injection systems.
Moderate – Should be addressed soon to prevent potential engine damage.
Ignoring this code may lead to increased emissions and potential safety hazards.
• Engine at operating temperature
• Vehicle at idle
The fuel injector for cylinder 3 is located on the engine block, typically on the side or top of the engine.
Q: Can I drive with a P2B15 code?
A: It's not recommended to drive for extended periods with this code as it can lead to further engine damage.
Q: How do I reset the P2B15 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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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.