What Does P269B Mean?
The PCM has detected an open circuit or electrical fault in the control circuit for the glow plug used to ignite fuel during exhaust aftertreatment regeneration. This glow plug is separate from engine starting glow plugs and assists DPF regeneration.
Common Causes
35%
Failed aftertreatment glow plug element
30%
Open circuit in glow plug wiring harness
20%
Corroded or loose glow plug connector
10%
Blown fuse or relay for glow plug circuit
5%
PCM control circuit failure
Diagnostic Steps
1
Step 1: Check fuse and relay for aftertreatment glow plug circuit; replace if blown or failed
2
Step 2: Disconnect glow plug connector and measure resistance of glow plug element; should be low ohms (typically 0.5-6 ohms)
3
Step 3: Check for battery voltage at glow plug connector with system activated using scan tool
4
Step 4: Inspect wiring harness and connectors for damage, corrosion, or loose connections
5
Step 5: Verify ground circuit continuity from glow plug to chassis/PCM ground
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or electrical fault in the control circuit for the glow plug used to ignite fuel during exhaust aftertreatment regeneration. This glow plug is separate from engine starting glow plugs and assists DPF regeneration.
The most common cause of P269B (Exhaust Aftertreatment Glow Plug Control Circuit/Open) is: Failed aftertreatment glow plug element
Typical repair costs for P269B range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but aftertreatment regeneration will fail, causing DPF clogging over time and potential engine derate or limp mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P269B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
