P2489: EGT Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5
The P2489 code indicates that the Engine Control Module (ECM) has detected 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 components like the diesel particulate filter (DPF) and turbocharger. An intermittent signal can be caused by wiring issues, connector corrosion, or a failing sensor. If left unaddressed, it may lead to reduced engine performance, increased emissions, or potential damage to exhaust aftertreatment systems.
01. Most Common Causes
- Faulty EGT sensor (Bank 2 Sensor 5)
- Damaged or corroded wiring/connectors
- Intermittent short or open in the sensor circuit
- ECM software issues or programming errors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Possible regeneration issues in diesel vehicles
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor and its wiring for damage or corrosion.
Step 3: Use a multimeter to test sensor resistance and compare to manufacturer specs.
Step 4: Check for intermittent signal by wiggling wiring harness while monitoring live data.
Step 5: If wiring is intact, replace the EGT sensor and clear codes.
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 lead to reduced performance and potential damage to exhaust components. Seek repair soon.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY sensor replacement, or $150 to $300 if professionally diagnosed and repaired.