P264D: Rocker Arm Actuator Position Sensor Circuit High Bank 1
The P264D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the rocker arm actuator position sensor on Bank 1 that is higher than the expected range. This sensor monitors the position of the rocker arm actuator, which controls variable valve timing or cylinder deactivation. A high circuit voltage typically points to a short to power, a faulty sensor, or wiring issues. This can lead to improper valve operation, reduced fuel efficiency, and potential engine performance problems.
01. Most Common Causes
- Faulty rocker arm actuator position sensor
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- ECM issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power loss
- Rough idle or misfire
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the wiring and connector for damage, corrosion, or shorts.
Step 3: Test the sensor voltage and resistance with a multimeter; compare to manufacturer specs.
Step 4: If sensor and wiring are okay, test the ECM output signal; replace ECM if faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine performance issues and potential damage to the valve train. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or ECM replacement is needed.