Exhaust Aftertreatment Glow Plug Performance
The P26A0 code indicates that the engine control module (ECM) has detected a performance issue with the exhaust aftertreatment glow plug. This glow plug is used to heat the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system to aid in regeneration and reduce emissions. The ECM monitors the glow plug's current draw and resistance; if these values fall outside expected parameters, the code sets. Common causes include a faulty glow plug, damaged wiring, or a failed relay.
1. Most Common Causes
- Faulty exhaust aftertreatment glow plug
- Open or shorted wiring in the glow plug circuit
- Failed glow plug relay or fuse
- Corroded or loose electrical connectors
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Increased exhaust emissions
- Possible DPF regeneration issues
3. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the glow plug wiring and connectors for damage or corrosion.
Step 3: Test the glow plug resistance with a multimeter (typically 0.5-2 ohms).
Step 4: Check for voltage at the glow plug connector with the key on (should be battery voltage).
Step 5: If voltage is present and resistance is out of spec, replace the glow plug.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but prolonged driving may lead to DPF clogging and reduced performance. It's best to address the issue promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.