P27B1Internal Control Module Transmission Range Select Performance
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P27B1 belongs to a family of codes raised by an independent supervision layer in the transmission or powertrain module. That layer repeats key transmission decisions in parallel and flags the main software when both results disagree, as a guard against unintended vehicle motion. Ford's 2024 OBD summary places P27B1 only in its table for the TR9070 dual-clutch transmission, filed as UDS P0701_96 for a safety-goal violation tied to the clutch shafts; the 2020–2023 issue does not list it. No other manufacturer documents the code publicly. P27B2 to P27B6 cover range control, gear selection, direction, ratio and speed sensing. Because the trigger is usually software or an implausible input rather than a broken part, updates and the related sensor codes are checked first.
- What you may notice
- Transmission warning or wrench light
- Restricted gear selection or default gear
- Likely causes
- LikelySupervision or main software calibration in the module
- PossibleImplausible clutch shaft speed or position input
- RareInternal fault in the transmission control module
- 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.