P2489: Exhaust Gas Temp Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5
The P2489 code indicates an intermittent or erratic signal from the exhaust gas temperature (EGT) sensor located in bank 2, sensor 5. This sensor monitors exhaust temperature to protect the diesel particulate filter (DPF) and turbocharger. An intermittent fault may cause incorrect readings, leading to reduced engine performance, regeneration issues, or limp mode.
1. Most Common Causes
- Faulty or degraded EGT sensor (Bank 2, Sensor 5)
- Damaged, corroded, shorted, or open wiring or connectors in the sensor circuit
- Loose connections, backed-out pins, or moisture in the sensor or PCM connector
- Exhaust leak near the sensor causing actual thermal fluctuations
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power or limp mode
- Poor fuel economy
- DPF regeneration issues
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensor wiring and connector for damage or corrosion.
Step 3: Test sensor resistance and compare to manufacturer specs.
Step 4: Check for exhaust leaks near the sensor.
Step 5: Clear code and test drive to see if it returns.
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 turbo failure. Limp mode may limit speed.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement; labor at a shop can add $100-$200.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.