OBD-II code · Powertrain (generic, extended)
P26A1 Exhaust Aftertreatment Glow Plug Circuit Low
The aftertreatment glow plug current is below expected. Either the element is partially open or supply is undersized.
Is it safe to drive with P26A1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPartial element failure raises resistance
- PossibleSupply voltage drops under load
- Less likelyConnector pins corroded - high contact resistance
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Aftertreatment Glow Plug, Supply Circuit
Related codes
- P269EExhaust Aftertreatment Glow Plug Control Circuit High
- P269FExhaust Aftertreatment Glow Plug Circuit / Open
- P26A0Exhaust Aftertreatment Glow Plug Performance
- P26A2Exhaust Aftertreatment Glow Plug Circuit High
- P26A3Engine Coolant Bypass Valve A Range/Performance
- P26A4Engine Coolant Bypass Valve A Position Sensor Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.