Exhaust Gas Temperature Sensor 1/2 Correlation Bank 2
The P20E5 code indicates a correlation issue between Exhaust Gas Temperature (EGT) Sensor 1 and Sensor 2 on Bank 2. These sensors monitor exhaust temperature for diesel particulate filter (DPF) regeneration and emission control. The PCM detects a signal mismatch, often due to sensor failure, wiring issues, or exhaust leaks. This can lead to improper DPF regeneration, reduced fuel economy, and potential engine damage if ignored.
01. Most Common Causes
- Faulty EGT sensor 1 or 2 on Bank 2
- Wiring or connector issues (corrosion, damage)
- Exhaust gas leaks near sensors
- PCM software or calibration error
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- DPF regeneration issues (frequent or incomplete)
- Possible limp mode or reduced engine power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensors and wiring for damage or corrosion.
Step 3: Compare sensor readings using a scan tool; check for erratic values.
Step 4: Test sensor resistance and voltage per manufacturer specs.
Step 5: Check for exhaust leaks near the sensors.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. The issue can cause improper DPF regeneration, leading to clogged filter and potential engine damage. Seek repair promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for sensor replacement, plus diagnostic fees. Labor may add $100-$200 depending on vehicle.