Pinpoint Test G : DTC P27B4
WARNING: This page is about a different car, the 2021 Ford Police Interceptor Utility. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to Transmission Controls
for schematic and connector information.
Normal Operation and Fault Conditions
The PCM monitors the OSS and TSS speed sensors to detect clutch faults that may cause Reverse in forward range or a forward gear in Reverse. The PCM can also detect a clutch that is failed off and might cause the vehicle to roll backwards in Drive or forward in Reverse. A misadjusted selector lever cable may also cause this condition (Column shift only).
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition PCM P27B4:00 Internal Control Module Transmission Gear Direction Control Performance: No Sub Type Information This DTC sets if the PCM detects a speed sensor fault, clutch faults that cause R in forward range or a forward gear in R. A misadjusted gearshift cable can also cause this issue. Possible Sources
- Selector lever cable out of adjustment
- Transmission concern
- G1 PCM SELF TEST
- Connect the diagnostic tool.
- Ignition ON.
- Perform the PCM self-test. If any speed sensor DTCs are present resolve them first.
Does DTC P27B4 set with P0600 and no other DTCs set?
Yes DISREGARD DTC P0600, and GO to G2 No If any speed sensor or TR sensor DTCs set, RESOLVE them first. GO to G3 - G2 CHECK TR AND GEARSHIFT POSITIONS
- Ignition ON.
- Using a diagnostic scan tool monitor the PID TR while moving the gear selector from Park to Reverse to Drive and back to Park.
Do the selector lever positions match the PID TR positions?
Yes GO to G3 No ADJUST the selector lever cable. REFER to: Selector Lever Cable Adjustment . - G3 CHECK TRANSMISSION FOR AN OBSERVABLE SYMPTOM
- Start the engine.
- Road test the vehicle.
Are any observable symptoms present?
Yes REFER to: Diagnosis By Symptom . No The transmission is operating correctly.