P2091"B" Camshaft Position Actuator Control Circuit High (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2091 says the control circuit of actuator B on bank 1, normally the exhaust phaser valve, sits too high. GM's high-side version on the 3.6 L LFX checks for a short to supply while the output is off and, like P2090, treats it as Type A after 20 of 25 samples; 18OBDG02 uses Type B. On the low-side controller of table 23OBDG07 the same code means the pin stays at supply voltage even though the driver should be pulling it to ground, and it takes about 1 s to confirm, two trips for the lamp. Ford shows P2091 in its 2014 petrol code list as a lamp code that both key-on and running self-tests can find. A short of this kind can overheat the driver, so the ECM usually switches the output off and leaves the exhaust cam at its default angle. Out-of-range timing of the same cam is P0014 or P0015.
- What you may notice
- Engine warning lamp on
- Exhaust cam stays at default angle, slightly reduced performance
- Likely causes
- LikelyExhaust valve control wire touching a supply wire
- RareIncorrect splice or pin swap after earlier wiring repair
- RareFailed output stage in the ECM
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.