Exhaust Gas Temperature Sensor Circuit Malfunction (Bank 2 Sensor 1)
The P0547 code indicates a problem with the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 1. This sensor monitors exhaust temperature to protect the catalytic converter and diesel particulate filter (DPF) from overheating. The Engine Control Module (ECM) detects a voltage signal outside the expected range, often due to a faulty sensor, wiring issues, or exhaust leaks. This code is common in diesel engines and can lead to reduced performance, increased emissions, and potential damage to emission control components if ignored.
1. Most Common Causes
- Faulty or damaged exhaust gas temperature (EGT) sensor
- Short to ground or voltage in the EGT sensor wiring
- Loose, corroded, or poor terminal connection at the sensor harness
- Open or short circuit in the exhaust system wiring harness
- Internal failure in the powertrain control module (PCM) or exhaust system control module
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power loss
- Increased fuel consumption
- Possible regeneration issues in diesel engines
- Engine may enter limp mode
3. Step-by-Step Diagnosis
Step 1: Connect an OBD2 scanner and confirm code P0547. Check for additional codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test sensor resistance and compare to manufacturer specifications.
Step 4: Check for exhaust leaks near the sensor that could affect readings.
Step 5: If sensor and wiring are okay, test the circuit at the ECM connector for continuity and shorts.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to overheating of the catalytic converter or DPF, causing expensive damage. Short trips to a repair shop are acceptable if the vehicle is not in limp mode.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY replacement of the sensor. Professional repair including diagnosis and labor may cost $150 to $300.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.