P26E8Actuator Supply Voltage D Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P26E8 says the voltage on supply rail D drops too far while the rail is switched on. In GM's 2023 and 2024 TCM tables this is watched continuously at high-side output 8: a timer runs when the voltage falls below a share of the supply or the averaged current is too high, and after 60 ms the code is set, Type A; it is suspended while P0882 or P0883 is present. Ford's 2024 table lists P26E8 as the shorted-load fault of driver 8 in the TR9070 dual-clutch unit. On Volvo and Mack trucks of the US13 generation the aftertreatment module uses this rail to feed both NOx sensors upstream and downstream of the SCR, the particulate sensor plus the DEF quality sender; bulletins K31280406 and KC-415 describe brief dips when all four draw peak power, with communication codes for these sensors and a possible derate warning.
- What you may notice
- Warning light on, often only briefly or intermittently
- Transmission failsafe mode with loss of the solenoids on that rail
- On trucks, lost communication with NOx, PM and DEF sensors and a derate warning
- Likely causes
- LikelySupply line or a connected load shorted to ground
- PossibleLoose or corroded battery, fuse or ground connections feeding the module, or weak batteries (Volvo/Mack aftertreatment module)
- PossibleFaulty sensor or solenoid on the rail drawing too much current
- RareInternal fault in the module output stage
- 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: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.