What Does P264C Mean?
The rocker arm actuator position sensor on Bank 1 is reporting abnormally low voltage. This electrical fault prevents the PCM from accurately determining actuator position.
Common Causes
35%
Position sensor signal wire short to ground
30%
Failed position sensor with internal short circuit
20%
Damaged or corroded sensor connector causing short
10%
Loss of sensor reference voltage (5V supply)
5%
PCM sensor input circuit failure
Diagnostic Steps
1
Step 1: Check sensor reference voltage at connector with key on (should be 4.5-5.5V)
2
Step 2: Measure sensor signal voltage; if reading near 0V, suspect short to ground
3
Step 3: Disconnect sensor and measure signal wire resistance to ground (should be infinite/open)
4
Step 4: Inspect sensor connector and wiring for damage, moisture, or pinched wires
5
Step 5: Replace position sensor or actuator assembly if sensor tests indicate internal failure
Estimated Repair Cost
$200 - $950
Parts + labor, varies by vehicle and location
The rocker arm actuator position sensor on Bank 1 is reporting abnormally low voltage. This electrical fault prevents the PCM from accurately determining actuator position.
The most common cause of P264C (A Rocker Arm Actuator Position Sensor Circuit Low Bank 1) is: Position sensor signal wire short to ground
Typical repair costs for P264C range from $200 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but expect reduced power and fuel economy. PCM will use default valve timing values.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P264C to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
Type
Generic (SAE)
Recommended Tools
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