Pinpoint Test Ag : DTC P27B2, P27B3, P27B4, P27B5, P27B6
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Normal Operation and Fault Conditions
The TCM monitors the TSS, OSS, ISSA and ISSB sensors to verify the achieved gear matches the selected gear. If the TCM detects a reverse gear when a forward gear is selected, a forward gear when reverse is selected, an incorrect gear ratio or a mismatch between speed sensors, it will set a DTC.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition TCM P27B2:00 Internal Control Module Transmission Range Control Performance: No Sub Type Information This DTC indicates a mismatch between the commanded gear range and the achieved gear range while entering or exiting park. TCM P27B3:00 Internal Control Module Transmission Gear Select Performance: No Sub Type Information This DTC indicates an incorrect gear state. TCM P27B4:00 Internal Control Module Transmission Gear Direction Control Performance: No Sub Type Information This DTC indicates the TCM detected a reverse engagement when a forward gear was selected, or a forward engagement when reverse was selected. TCM P27B5:00 Internal Control Module Transmission Gear Ratio Control Performance: No Sub Type Information This DTC indicates a mismatch between the speed sensor readings and the commanded gear ratio. TCM P27B6:00 Internal Control Module Transmission Speed Sensor Performance: No Sub Type Information This DTC indicates a mismatch between the TSS, ISSA and ISSB sensors. Possible Sources
- Selector lever cable adjustment
- Clutch fault
- Speed sensor fault
- TR sensor fault
- TCM
- AG1 CHECK THE SELECTOR LEVER CABLE ADJUSTMENT
- Verify the selector lever cable is adjusted correctly. REFER to: Selector Lever Cable Adjustment - 10-Speed Automatic Transmission - 10R80, Vehicles With: Column Shift . REFER to: Selector Lever Cable Adjustment - 10-Speed Automatic Transmission - 10R80, Vehicles With: Floor Shift .
Is the selector lever cable adjusted correctly?
Yes GO to AG2 No ADJUST the selector lever cable. REFER to: Selector Lever Cable Adjustment - 10-Speed Automatic Transmission - 10R80, Vehicles With: Column Shift . REFER to: Selector Lever Cable Adjustment - 10-Speed Automatic Transmission - 10R80, Vehicles With: Floor Shift . - AG2 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs).
- Road test the vehicle.
- In a parking lot, shift the vehicle between Park, Drive and Reverse, allowing the vehicle to move in both directions.
- Using a diagnostic scan tool, carry out the TCM self-test.
Is DTC P27B2, P27B3, P27B4, P27B5 and/or P27B6 present in the TCM?
Yes GO to AG3 No The fault is not present at this time. If any symptoms are present, REFER to: Diagnosis By Symptom . - AG3 RETRIEVE ALL DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE TCM (TRANSMISSION CONTROL MODULE) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, retrieve all diagnostic trouble codes (DTCs) from the TCM self-test.
Are any shift solenoid, speed sensor, TR sensor or clutch engagement diagnostic trouble codes (DTCs) present?
Yes RESOLVE those diagnostic trouble codes (DTCs) first. REFER to the Diagnostic Trouble Code (DTC) Chart . No If any gear engagement symptoms are present, RESOLVE those first. REFER to: Diagnosis By Symptom . If only P27B2, P27B3, P27B4, P27B5 and/or P27B6 are present with no symptoms, GO to AG4 - AG4 PROGRAM THE TCM (TRANSMISSION CONTROL MODULE) WITH THE LATEST CALIBRATION
- Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the TCM.
- Program the TCM with the latest calibration. REFER to: Module Programming .
- Carry out the transmission strategy download. REFER to: Transmission Strategy Download .
- Road test the vehicle.
- In a parking lot, shift the vehicle between Park, Drive and Reverse, allowing the vehicle to move in both directions.
- Using a diagnostic scan tool, carry out the TCM self-test.
Is DTC P27B2, P27B3, P27B4, P27B5 and/or P27B6 present in the TCM?
Yes INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . No The concern is not present at this time. It might have been caused by a corrupted calibration.