P27B2Internal Control Module Transmission Range Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P27B2 is set when the monitoring layer cannot confirm that the gearbox is really in the range the main software intends. In GM's 2024 tables for heavy-duty trucks, the TCM checks actual solenoid and pressure switch states with the pattern expected for the range; if they disagree for a full second, the code is logged, lighting the MIL on the first trip. Ford's 2020–2024 summaries treat it as a non-MIL fault on cars with electronic shifting, recognised in less than 3 s. Ford bulletins tie it to electronic shifter events: SSM 47877 (Navigator 2018/19 and Nautilus 2019, stuck in park after R or D was chosen from remote start without braking), SSM 49642 (Explorer and Aviator built for 2020/21, park release used in the plant) and TSB 25-2362 (2023–2025 Escape and Corsair hybrids, 2025 Maverick hybrid, MIL from SOBDMC software).
- What you may notice
- Vehicle stuck in park or will not start
- Warning lamp or transmission message
- Range change refused
- Likely causes
- LikelyModule software (Ford fixes by reprogramming, e.g. TSB 25-2362)
- PossibleUnusual operating sequence such as selecting a gear after remote start without braking
- PossibleSolenoid or pressure switch state not matching the commanded range
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.