P27B3 code meaning
Internal Control Module Transmission Gear Select Performance
What P27B3 means
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.
P27B3 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P27B3
- Wrench light or transmission message
- Certain gears or engine braking functions blocked
Common causes of P27B3
- PossibleSupervision software or calibration
- PossibleElectrical fault at the selectable one-way clutch actuator (Ford 8/10-speed)
- Less likelySafety-relevant CAN transmit signal faulty (Ford TR9070)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
TCM
What each part of P27B3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| B3 | The exact fault in that area. |
What to do next
- Note P27B3 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P27B3
What does P27B3 mean?
P27B3 means "Internal Control Module Transmission Gear Select Performance". P27B3 is the monitoring code for the path that turns a chosen gear into actuator commands. It is a generic code, so it means the same on every make.
Is it safe to drive with P27B3?
Drive gently and only to a workshop. With P27B3 the car can go into limp mode (reduced power) to protect itself.
Will P27B3 fail an emissions test?
P27B3 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P27B3 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 6 hours of work. This is a job for a workshop.
Will P27B3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.