What are the common causes of P26A0?

A weak exhaust aftertreatment glow plug that heats too slowly. A failed exhaust aftertreatment glow plug. High resistance in the exhaust aftertreatment glow plug feed. A failing exhaust aftertreatment glow plug control module.

Read exhaust aftertreatment glow plug status on a scan tool. Command the exhaust aftertreatment glow plug on and watch heat up time. Test the exhaust aftertreatment glow plug resistance. Check the exhaust aftertreatment glow plug control module output. Replace the exhaust aftertreatment glow plug if it heats too slowly. Clear the code and retest.

P26A0

Exhaust Aftertreatment Glow Plug Performance

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

What it means

P26A0 means Exhaust Aftertreatment Glow Plug Performance.

Check these first

A weak exhaust aftertreatment glow plug that heats too slowly
A failed exhaust aftertreatment glow plug
High resistance in the exhaust aftertreatment glow plug feed
A failing exhaust aftertreatment glow plug control module

What to do next

Read exhaust aftertreatment glow plug status on a scan tool
Command the exhaust aftertreatment glow plug on and watch heat up time
Test the exhaust aftertreatment glow plug resistance
Check the exhaust aftertreatment glow plug control module output
Replace the exhaust aftertreatment glow plug if it heats too slowly
Clear the code and retest

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Updated

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