P26E9 code meaning
Actuator Supply Voltage D Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P26E9 means
The high fault of rail D is about voltage where none should be: the controller has turned supply D off, yet the line stays live. Either the high-side switch inside the module no longer opens or an outside wire touches battery positive. GM's 2023 and 2024 TCM tables check this for output 8 during shutdown; if the line holds more than 70 % of battery voltage with the output disabled, a shorted switch is noted in permanent memory and reported once the module wakes up again. Battery voltage must stay between 8.75 and 18 V and change by less than 1.5 V during the test, and GM rates the code Type B, so two failing trips light the lamp. Ford's 2024 summary names P26E9 as the shorted-switch fault of driver 8 in the TR9070. Because the loads can no longer be cut as a group, the module will normally fall back to a safe mode.
P26E9 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P26E9
- Warning light on after two drive cycles
- Transmission in limp mode or with restricted gears
- Code appears after restarting rather than while driving
Common causes of P26E9
- Most likelyHigh-side switch in the control module stuck closed
- PossibleSupply D wire chafed against a battery or ignition feed
- Less likelyWater or corrosion in the module connector creating a leakage path
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Actuator supply dControl moduleWiring harness
What each part of P26E9 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| E9 | The exact fault in that area. |
What to do next
- Note P26E9 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 P26E9
What does P26E9 mean?
P26E9 means "Actuator Supply Voltage D Circuit High". The high fault of rail D is about voltage where none should be: the controller has turned supply D off, yet the line stays live. It is a generic code, so it means the same on every make.
Is it safe to drive with P26E9?
Drive gently and only to a workshop. With P26E9 the car can go into limp mode (reduced power) to protect itself.
Will P26E9 fail an emissions test?
Yes, it can. P26E9 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 P26E9 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P26E9 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.