P266C code meaning
"A" Rocker Arm Actuator Position Sensor Circuit Low (Bank 2)
Powertrain system Generic code P26xx codes Check engine light
What P266C means
P266C reports a bank 2 position sensor signal for actuator A that has fallen under its lower plausibility limit. Grounded signal wires, a missing sensor supply or an internal sensor short pull it down; a connector left half unplugged after other work on the harder-to-reach side of the engine is another possible trigger. No manufacturer documents P266C publicly, so there are no published thresholds. Under CARB's comprehensive component rules, such a range check is mandatory for sensors in a lift system. The controller then holds bank 2 at a safe fixed lift. The high-side partner is P266D, the bank 1 equivalent P264C.
P266C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P266C
- MIL on
- Bank 2 held at fixed lift
- Less pulling power
Common causes of P266C
- Most likelyBank 2 sensor signal shorted to ground
- PossibleConnector not fully seated after other repairs
- PossibleMissing sensor supply voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rocker arm position sensor a b2Wiring harness
What each part of P266C means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 6C | The exact fault in that area. |
What to do next
- Note P266C and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P266C
What does P266C mean?
P266C means ""A" Rocker Arm Actuator Position Sensor Circuit Low (Bank 2)". P266C reports a bank 2 position sensor signal for actuator A that has fallen under its lower plausibility limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P266C?
Drive gently and only to a workshop. With P266C the car can go into limp mode (reduced power) to protect itself.
Will P266C fail an emissions test?
Yes, it can. P266C is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P266C to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P266C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.