P27EE code meaning
Transmission Range Control A Position Sensor/Switch Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P27EE means
The opposite of P27ED: the position sensor of mode valve A reads higher than any valid state. GM's TCM tables for the T87A nine-speed of 2018 and the rear-drive ten-speed of 2020 set P27EE when the raw signal exceeds 2.538 V for 0.100 s inside a 0.163 s sample, describing it as a short to voltage on the sensor circuit; the MIL comes on at once (Type A). A sensor that has lost its ground return can also float upward and mimic a short. While the fault is present, GM blocks the plausibility test P27EC and several pressure checks, since the valve position is unknown. Repairs usually involve the internal harness or the sensor; valve B reports the same condition as P27F2, the open band as P27EB.
P27EE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P27EE
- MIL on from the first trip
- Range changes restricted, possible reduced mode
Common causes of P27EE
- Most likelySensor signal shorted to a voltage source
- PossibleSensor ground open, signal drifts high
- Less likelyHall sensor output stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Range control position sensor aWiring harnessTCM
What each part of P27EE 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. |
| EE | The exact fault in that area. |
What to do next
- Note P27EE 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 P27EE
What does P27EE mean?
P27EE means "Transmission Range Control A Position Sensor/Switch Circuit High". The opposite of P27ED: the position sensor of mode valve A reads higher than any valid state. It is a generic code, so it means the same on every make.
Is it safe to drive with P27EE?
Drive gently and only to a workshop. With P27EE the car can go into limp mode (reduced power) to protect itself.
Will P27EE fail an emissions test?
Yes, it can. P27EE is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P27EE to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P27EE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.