Exhaust Gas Temperature Sensor Circuit/Open Bank 2 Sensor 5
The P2485 code indicates an open circuit in the exhaust gas temperature (EGT) sensor circuit 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 engine control module (ECM), often due to a broken wire, damaged connector, or failed sensor. This can lead to incorrect exhaust temperature readings, potentially causing DPF regeneration issues or reduced engine performance.
1. Most Common Causes
- Open or shorted wiring in the EGT sensor circuit
- Corroded or damaged connector at the sensor
- Failed exhaust gas temperature sensor
- ECM internal fault (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible DPF regeneration issues
- Engine may enter limp mode
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the EGT sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure resistance across the sensor terminals; compare to manufacturer specifications (typically 100-200 kΩ at room temperature).
Step 4: Check for voltage at the sensor connector with the ignition on; should be around 5V reference signal.
Step 5: If wiring and voltage are okay, replace the EGT sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. The ECM may limit engine power or disable DPF regeneration, potentially causing further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and sensor location.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.