Powertrain, generic (extended)

P27B3 Internal Control Module Transmission Gear Select Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P27B3 is the monitoring code for the path that turns a chosen gear into actuator commands. In Ford's wording it supervises the actuator manager. In the 2020–2023 summary it is non-MIL on park-by-wire vehicles; the 2024 edition links it to the selectable one-way clutch (SOWC) of the eight- and ten-speed automatics, with UDS P0701_9A for an electrical SOWC fault and P0701_94 for a failed shut-off path or an unintended application, both non-MIL and detected within one second. In Ford's TR9070 dual-clutch table, P27B3 additionally covers a fault in safety-relevant CAN transmit signals. No other manufacturer documents P27B3 publicly. The trigger can be software, a wiring problem at the SOWC actuator or the actuator itself.

Likely causes

Supervision software or calibration
Electrical fault at the selectable one-way clutch actuator (Ford 8/10-speed)
Safety-relevant CAN transmit signal faulty (Ford TR9070)

Symptoms

  • Wrench light or transmission message
  • Certain gears or engine braking functions blocked

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,000
Time0.3–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

tcm

Related codes

P27B1P27B2P27B4P27B5P0701

References: fordservicecontent.com, fordservicecontent.com.