Exhaust Aftertreatment Glow Plug Performance
The P26A0 code indicates that the powertrain control module (PCM) has detected a performance issue with the exhaust aftertreatment glow plug. This glow plug is used in diesel engines to heat the exhaust aftertreatment system, typically the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system, to help reduce emissions during cold starts or regeneration. The code is set when the glow plug fails to reach the expected temperature or takes too long to heat up, often due to electrical faults, failed glow plug, or control module issues.
01. Most Common Causes
- Faulty exhaust aftertreatment glow plug
- Open or shorted glow plug circuit wiring or connectors
- Failed glow plug control module or relay
- Blown fuse related to the glow plug system
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Increased exhaust emissions
- Reduced fuel economy
- Possible difficulty passing emissions test
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the glow plug wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the glow plug resistance with a multimeter; compare to manufacturer specifications.
Step 4: Check the glow plug control module and relay for proper operation and voltage supply.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but prolonged driving may cause increased emissions and potential damage to the aftertreatment system. It is recommended to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the specific component (glow plug, wiring, or module) and labor rates.