OBD-II code · Powertrain (generic, extended)
P27B6 Internal Control Module Transmission Speed Sensor Performance
The internal speed sensor processing logic in the transmission control module produces implausible results.
Is it safe to drive with P27B6?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInternal software logic fault
- PossibleAged input capture circuitry drifts
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm, Speed Sensors
Related codes
- P27B3Internal Control Module Transmission Gear Select Performance
- P27B4Internal Control Module Transmission Gear Direction Control Performance
- P27B5Internal Control Module Transmission Gear Ratio Control Performance
- P27B9Pressure Control Solenoid N Performance/Stuck Off
- P27BAPressure Control Solenoid N Stuck On
- P27BBPressure Control Solenoid N Electrical
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.