What Does P269D Mean?
The PCM has detected abnormally low voltage or current in the exhaust aftertreatment glow plug control circuit. This electrical fault prevents the glow plug from heating properly during regeneration.
Common Causes
35%
Short to ground in glow plug wiring harness
30%
Failed aftertreatment glow plug with internal short
20%
Damaged or corroded glow plug connector
10%
Failed glow plug control relay or module
5%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect glow plug connector and measure glow plug resistance; extremely low reading indicates short
2
Step 2: Check for short to ground by measuring continuity between glow plug circuit and chassis ground
3
Step 3: Inspect glow plug connector and terminals for corrosion, damage, or moisture
4
Step 4: Test glow plug relay or control module operation using scan tool active tests
5
Step 5: Trace wiring harness for damage, particularly near exhaust components or areas with heat exposure
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage or current in the exhaust aftertreatment glow plug control circuit. This electrical fault prevents the glow plug from heating properly during regeneration.
The most common cause of P269D (Exhaust Aftertreatment Glow Plug Control Circuit Low) is: Short to ground in glow plug wiring harness
Typical repair costs for P269D range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to operate but regeneration will not complete, leading to progressive DPF clogging and eventual engine performance degradation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P269D to identify the root cause.
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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.
