What Does P266E Mean?
The rocker arm actuator position sensor signal on Bank 2 is fluctuating outside normal parameters or providing inconsistent readings. This intermittent condition suggests poor connections, damaged wiring, or a failing sensor. The ECM cannot reliably monitor valve timing position.
Common Causes
35%
Loose or corroded electrical connector at position sensor
30%
Intermittent open or short in wiring harness due to vibration or chafing
25%
Failing rocker arm actuator position sensor with internal intermittent fault
7%
Poor ground connection causing erratic signal
3%
ECM internal fault causing signal processing errors
Diagnostic Steps
1
Step 1: Wiggle test all wiring and connectors related to Bank 2 rocker arm position sensor while monitoring live data for signal dropout
2
Step 2: Thoroughly inspect connector terminals for corrosion, bent pins, or poor contact; clean and apply dielectric grease if needed
3
Step 3: Check wiring harness routing for contact with hot or moving components that could cause intermittent shorts
4
Step 4: Monitor sensor signal voltage with oscilloscope during engine operation to identify signal irregularities
5
Step 5: Replace sensor if all connections and wiring are verified good but intermittent signal persists
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The rocker arm actuator position sensor signal on Bank 2 is fluctuating outside normal parameters or providing inconsistent readings. This intermittent condition suggests poor connections, damaged wiring, or a failing sensor. The ECM cannot reliably monitor valve timing position.
The most common cause of P266E (A Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2) is: Loose or corroded electrical connector at position sensor
Typical repair costs for P266E range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive short distances but may experience intermittent performance issues, hesitation, or stalling. Should be repaired promptly to prevent potential engine damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P266E 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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