P2E18Intermediate Shaft Selection Actuator Position Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Here the position sensor of the intermediate shaft selection actuator reports a value above its upper limit. Most often the signal line has contact with battery voltage or the 5 V feed, or the sensor has lost its ground so the output floats upward. No manufacturer documents P2E18 publicly. For a rod sensor, GM's transmission tables from 2023 (23OBDG07) use this rule under P2834: no pulses with more than 3500 mV on the pin, or a duty cycle above 92 %, checked for 150 ms while battery voltage lies between 8.75 and 18 V, Type A. CARB treats such sensors as comprehensive components with mandatory range checks. A voltage check of signal and ground with the actuator plugged in narrows it down quickly. The low fault of the same sensor is P2E17, the high fault of the main selection actuator P2E13.
- What you may notice
- MIL and transmission warning
- Certain gears blocked, limp mode
- Poor acceleration because the gearbox holds an unsuitable gear
- Likely causes
- LikelySignal line shorted to battery voltage or the 5 V feed
- PossibleSensor ground open or corroded
- PossiblePosition sensor output stuck high
- RareFaulty input stage in the transmission control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.