P264C is set when the signal from the position sensor of rocker arm actuator A, bank 1, sits below its valid window. Typical electrical explanations are a short of the signal wire to ground, a lost 5 V reference, or a sensor that has failed internally. CARB lists such out-of-range checks for every sensor in a lift or timing system under the comprehensive component rules. No carmaker publishes P264C with a threshold; it would only appear on engines whose actuator carries position feedback, such as motor-driven continuous lift designs. Expect the controller to stop adjusting lift, with weaker pull and higher consumption; P264D is the high-side counterpart.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.
Symptoms
- MIL on
- Weaker pull, lift no longer varied
- Higher fuel consumption
Most likely causes
- Signal wire shorted to ground
- 5 V sensor supply missing
- Position sensor failed internally
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P264C means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 6: Control modules and outputs
- 4C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P264C?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P264C?
The most common causes are: signal wire shorted to ground; 5 V sensor supply missing; position sensor failed internally.
Related codes
- P264A"A" Rocker Arm Actuator Position Sensor Circuit (Bank 1)
- P264D"A" Rocker Arm Actuator Position Sensor Circuit High (Bank 1)
- P266C"A" Rocker Arm Actuator Position Sensor Circuit Low (Bank 2)
- P265C"B" Rocker Arm Actuator Position Sensor Circuit Low (Bank 1)
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.