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 getting a signal that is too high from a sensor that helps control the engine's valves on one side of the engine.
The engine control module (ECM) detects a high voltage signal from the rocker arm actuator position sensor on bank 2, indicating a potential issue with the sensor or its circuit.
The P266D code is triggered when the ECM receives a signal from the rocker arm actuator position sensor that is higher than the expected range. This sensor monitors the position of the rocker arm actuator, which adjusts the position of the rocker arms to optimize engine performance. Bank 2 refers to the side of the engine opposite to cylinder 1.
• Check Engine Light illuminated
• Reduced engine performance
• Engine misfires or runs rough
• Faulty rocker arm actuator position sensor
• Wiring issues or poor connections in the sensor circuit
• ECM malfunction
ECM: Engine Control Module, the computer that controls engine functions.
Rocker Arm: A component in the engine that helps open and close the valves.
• Use an OBD-II scanner to confirm the code and check for other related codes.
• Inspect the wiring and connectors for the rocker arm actuator position sensor on bank 2.
• Test the sensor using a multimeter to check for proper voltage and resistance.
• Repair or replace damaged wiring or connectors.
• Replace the faulty rocker arm actuator position sensor.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Honda Accord
• Acura MDX
• Chevrolet Silverado
• Regular maintenance and inspection of engine components.
• Ensure proper electrical connections and wiring integrity.
• Use high-quality engine oil to prevent wear on engine components.
Sensor Issue
• Do not ignore the Check Engine Light; have the vehicle inspected promptly.
• Avoid hard driving until the issue is resolved to prevent further damage.
Check with your vehicle manufacturer for specific warranty coverage related to engine sensors.
P266D is a relatively uncommon code but can occur in vehicles with advanced variable valve timing systems.
Moderate – Address the issue soon to avoid potential engine performance problems.
Driving with a malfunctioning engine sensor can lead to reduced performance and increased emissions, which may not comply with local regulations.
• Engine at operating temperature
• Vehicle in a safe and stationary position
The rocker arm actuator position sensor is typically located on the cylinder head of bank 2.
Q: Can I drive my car with a P266D code?
A: It's not recommended to drive for an extended period with this code, as it may lead to reduced engine performance and increased emissions.
Q: How can I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code after repairs are completed, or disconnect the battery for a few minutes to reset the ECM.
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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.