P246A: Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 3
The P246A 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 3. This sensor monitors exhaust temperature to protect components like the diesel particulate filter (DPF) and turbocharger. An intermittent signal can result from wiring issues, connector corrosion, or a failing sensor, leading to incorrect temperature readings and potential emissions or performance problems.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connectors
- Intermittent short or open circuit in sensor harness
- ECM software issues or programming errors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Decreased engine performance or power loss
- Possible DPF regeneration issues
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P246A.
Step 2: Visually inspect the EGT sensor and its connector for damage, corrosion, or loose pins.
Step 3: Use a multimeter to check sensor resistance and compare to manufacturer specifications.
Step 4: Check for continuity and shorts in the wiring between the sensor and ECM.
Step 5: If wiring is intact, replace the EGT sensor and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as incorrect temperature readings can lead to DPF damage or reduced engine performance. Short trips to a repair shop are generally acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, depending on labor rates and parts pricing.