Exhaust Gas Temperature Sensor Circuit Open Bank 2 Sensor 5
The P2485 code indicates an open circuit in the exhaust gas temperature (EGT) sensor for Bank 2, Sensor 5. This sensor monitors exhaust temperature to protect the diesel particulate filter (DPF) and turbocharger. An open circuit means the sensor is not sending a signal to the ECU, often due to a broken wire, damaged connector, or failed sensor. This can lead to incorrect temperature readings, potentially causing regeneration issues or reduced engine performance.
01. Most Common Causes
- Open or shorted wiring in the EGT sensor circuit
- Corroded or damaged connector at sensor or ECU
- Failed EGT sensor (internal open circuit)
- Damaged harness due to heat or abrasion
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible DPF regeneration issues
- Engine may enter limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor wiring and connector for damage or corrosion.
Step 3: Use a multimeter to check resistance across sensor terminals; compare to specs (typically 100-200k ohms at room temp).
Step 4: Check for continuity in wiring between sensor and ECU; repair or replace as needed.
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 cause DPF clogging or turbo damage. Short trips may be okay, but repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement; labor at a shop adds $100-$200.