P269B
Exhaust Aftertreatment Glow Plug Control Circuit / Open
The control line for the aftertreatment glow plug (used on some diesels to ignite injected HC during DPF regeneration) is open. Active regeneration cannot start.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
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.
- Open coil in glow plug control relayCommon
- Broken control wirePossible
Parts involved
- Aftertreatment Glow Plug
- Control Module
- Wiring Harness
P269B 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.