Powertrain
Definition only
Lights the check engine lamp
P26DF: Sensor Power Supply D Circuit / Open
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26DF mean?
The 5 V supply rail D for sensors is open. All sensors fed from this rail report invalid readings.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Open wire on the supply rail
- Medium Open inside the ECU regulator output
Likelihood is a general estimate across vehicles; your make and model may differ.
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P26DF in the community
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