What are the common causes of P26F0?

Starter relay A contacts welded closed. Starter relay A control wire shorted to voltage. Failed starter relay A. Corroded relay A connector. ECM driver fault keeping relay A energized.

Check starter relay A state in live data. Test the starter relay A control wire for a short to voltage. Swap starter relay A with a known good one. Inspect the relay A connector. Verify the relay A control output at the ECM. Clear the code and retest.

P26F0

Starter Relay A Stuck On

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

What it means

P26F0 means Starter Relay A Stuck On.

Where it lives

For P26F0, the description names the relay as the part involved.

Check these first

Starter relay A contacts welded closed
Starter relay A control wire shorted to voltage
Failed starter relay A
Corroded relay A connector
ECM driver fault keeping relay A energized

What to do next

Check starter relay A state in live data
Test the starter relay A control wire for a short to voltage
Swap starter relay A with a known good one
Inspect the relay A connector
Verify the relay A control output at the ECM
Clear the code and retest

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Updated

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