P26A0
Exhaust Aftertreatment Glow Plug Performance
The aftertreatment glow plug heats but exhaust temperature does not rise as expected. Combustion of injected HC may not start.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Common causes
Ordered by how often each turns out to be the cause.
- Aged glow plug heats slowly or unevenlyCommon
- HC supply from 7th injector below requiredPossible
Parts involved
- Aftertreatment Glow Plug
- Exhaust Temperature Sensor
P26A0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.