Exhaust Aftertreatment Glow Plug Control Circuit/Open
The P269B code indicates a fault in the control circuit of the exhaust aftertreatment glow plug, which is used to heat the diesel particulate filter (DPF) during regeneration. The powertrain control module (PCM) has detected an open or short circuit in the glow plug control circuit, preventing proper operation. This can lead to incomplete DPF regeneration, increased emissions, and potential clogging of the exhaust system.
01. Most Common Causes
- Faulty exhaust aftertreatment glow plug
- Open or shorted wiring in the glow plug control circuit
- Corroded or damaged connector at the glow plug
- Failed glow plug control module or relay
02. Symptoms You Will Notice
- Illuminated check engine light
- Reduced fuel economy
- Decreased engine performance
- Possible DPF regeneration issues or warning lights
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the glow plug wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure resistance of the glow plug; compare to manufacturer specifications (typically 0.5-2 ohms).
Step 4: Check for voltage at the glow plug connector with the ignition on; should be battery voltage.
Step 5: Test the glow plug control module/relay for proper operation and output.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF clogging and costly repairs. Short trips may be possible, but the issue should be addressed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Replacing a glow plug is around $50-$150, while wiring repairs or module replacement can be higher.