P27E9Transmission Range Control B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P27E9 reports that a line of range control circuit B sits too close to zero volts, pointing to a grounded line or a sensor that pulls its output down. It is not described publicly by any manufacturer. The documented counterpart on channel A is Mitsubishi's P07EA (2022 service manual for a CVT with electric shift): an input under 0.6 V on one of the eight selector sensors for 2.4 s sets it, the cause being a grounded or open sensor line, and the vehicle keeps driving normally. With shift-by-wire there is no mechanical link to fall back on, so redundant channels matter. Look for pinched wiring under the console. The sensor B counterparts in GM's internal range selection are P27F1 and P27F2.
- What you may notice
- Shift system warning on the display
- Usually no change in how the car drives
- Likely causes
- LikelyHarness pinched under the center console, shorted to ground
- PossibleSelector sensor output shorted internally
- RareSensor supply interrupted, output drops to zero
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.