What are the common causes of P26E1?

Sensor power supply D shorted to voltage. Failed sensor on supply D. Corroded supply D connector. ECM driver fault on supply D. Wrong reference feed to supply D.

Measure sensor power supply D. Test the supply D wire for a short to voltage. Unplug the sensors on supply D one at a time. Inspect the supply D connector. Verify the supply D output at the ECM. Clear the code and retest.

P26E1

Sensor Power Supply D Circuit High

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P26E1 means Sensor Power Supply D Circuit High.

Where it lives

For P26E1, the circuit described runs through the sensor. The description of P26E1 reports a fault at the sensor.

Check these first

Sensor power supply D shorted to voltage
Failed sensor on supply D
Corroded supply D connector
ECM driver fault on supply D
Wrong reference feed to supply D

What to do next

Measure sensor power supply D
Test the supply D wire for a short to voltage
Unplug the sensors on supply D one at a time
Inspect the supply D connector
Verify the supply D output at the ECM
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.