P0547
UniversalExhaust Gas Temperature Sensor Circuit - Bank 2 Sensor 1
Medium SeverityThis code indicates an issue with the electrical circuit of the Exhaust Gas Temperature Sensor (EGT) on Bank 2, Sensor 1. This sensor monitors the temperature of the exhaust gas, and a circuit fault means the engine control unit (ECU) is not receiving correct information, which can affect emissions control and engine performance.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on exhaust components. Hot exhaust can cause severe burns. Disconnect the battery before performing any electrical work to prevent accidental shorts or injury. Use appropriate jack stands if lifting the vehicle.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased fuel consumption
- Failed emissions test
- Difficulty with Diesel Particulate Filter (DPF) regeneration (on diesel vehicles)
Common Causes
- Faulty Exhaust Gas Temperature Sensor (EGT sensor)
- Damaged, corroded, or open wiring in the EGT sensor circuit
- Poor electrical connection at the sensor or ECU
- Shorted EGT sensor circuit
- Faulty Engine Control Unit (ECU) (rare)
Frequently reported on: Ford F-Series Diesel 2008-2016, Chevrolet Silverado/GMC Sierra Diesel 2007-2015, Ram 2500/3500 Diesel 2007-2018, Volkswagen TDI models 2009-2015, Mercedes-Benz Sprinter 2007-2018
Diagnostic Steps
- Visually inspect the EGT sensor and its wiring for any obvious signs of damage, corrosion, or loose connections. Pay close attention to areas where wiring might rub against hot exhaust components or sharp edges.
- Using a multimeter, test the continuity and resistance of the EGT sensor. Refer to your vehicle's service manual for specific resistance values at various temperatures.
- Check the voltage supply to the EGT sensor harness connector. Typically, there should be a reference voltage (e.g., 5V) present.
- If the sensor tests bad or wiring is damaged, replace the faulty EGT sensor or repair the damaged wiring.
- Clear the P0547 code using an OBD-II scanner and test drive the vehicle to ensure the repair is successful and the code does not return.
👨🔧 When to Call a Professional
If after checking connections and basic wiring, the fault persists, or if you suspect complex wiring issues or an ECU fault, it's best to consult a professional diagnostic technician. Specialized tools may be required for precise circuit testing or ECU diagnosis.
Commonly Asked Questions
What does 'Bank 2 Sensor 1' mean for the EGT sensor?
Bank 2 refers to the cylinder bank that does not contain cylinder #1. Sensor 1 typically indicates the sensor located before the catalytic converter or Diesel Particulate Filter (DPF) on that bank.
Can I drive with an active P0547 code?
While you might be able to drive, it's not recommended long-term. An EGT sensor fault can lead to inefficient emissions control, increased fuel consumption, reduced engine performance, and potentially prevent DPF regeneration, which could cause further damage.
How do I test an Exhaust Gas Temperature Sensor?
You can test an EGT sensor using a multimeter to measure its resistance. The resistance should change predictably with temperature. Consult your vehicle's service manual for the correct resistance values and testing procedures.
Is replacing an EGT sensor a difficult DIY repair?
It's a moderately difficult repair. Access to the sensor can be challenging as it's typically located on the exhaust system, often requiring lifting the vehicle. Basic hand tools are usually sufficient, but specialized sockets or wrenches might be needed.
Will a faulty EGT sensor affect my vehicle's emissions test?
Yes, a faulty EGT sensor can negatively impact your vehicle's emissions. The ECU relies on EGT readings for proper fuel management and emissions control strategies. A P0547 code will likely result in a failed emissions test.