P26E9Actuator Supply Voltage D Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Warning light on after two drive cycles
- Transmission in limp mode or with restricted gears
- Code appears after restarting rather than while driving
- Likely causes
- LikelyHigh-side switch in the control module stuck closed
- PossibleSupply D wire chafed against a battery or ignition feed
- RareWater or corrosion in the module connector creating a leakage path
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.