P27B6

Internal Control Module Transmission Speed Sensor Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Incorrect gear shifting
Switching delays
Switching to emergency mode of the gearbox
Check Engine Light Illuminates
Decreased fuel efficiency

Causes

Transmission speed sensor malfunction
Problems with wiring to the sensor
Transmission control module (TCM) malfunction
Mechanical damage inside the gearbox
TCM software problems

How to Fix

Check the condition of the transmission speed sensor
Check the integrity of wiring and connectors
Read error codes using an OBD-II scanner
Check the condition of the transmission control module
If necessary, replace the sensor or control module

Related codes

P27B5 P27B7 P27B8