Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2
The P2084 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the exhaust gas temperature (EGT) sensor located after the diesel particulate filter (DPF) on Bank 1, Sensor 2. This sensor monitors exhaust temperature to protect the DPF and optimize regeneration. The ECM compares the sensor's signal to expected values; if the signal is out of range or changes too slowly, it sets this code. Common causes include a faulty sensor, wiring issues, exhaust leaks, or a restricted DPF.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connector
- Exhaust system leaks
- Restricted or clogged DPF
- ECM software issues
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Decreased engine performance
- DPF regeneration issues
- Possible limp mode activation
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the EGT sensor and wiring for damage or corrosion.
Step 3: Use a multimeter to test sensor resistance and compare to specifications.
Step 4: Check for exhaust leaks near the sensor.
Step 5: Monitor sensor voltage with a scan tool while engine is running.
Step 6: If sensor is faulty, replace it and clear codes.
4. 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 damage or reduced performance. Short trips may be okay, but have it diagnosed soon.
How much does it cost to fix?▼
Typically $50-$150 for the sensor part, plus labor if you don't DIY. Total cost can range from $100 to $300 depending on the shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.