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Summary
  • The diagnostic trouble code (DTC) P0546 indicates “Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1.”
  • Your vehicle’s powertrain control module (PCM) will log this code if it receives an incorrect signal from the exhaust gas temperature sensor #1 on the engine bank 1.
  • Common causes of the P0546 code are bad exhaust gas temperature sensor, a bad PCM, or connector or wiring problems.
  • A vehicle that sets a P0546 code can show symptoms like check engine light illumination and reduced engine performance.

Exhaust gases are byproducts of the engine burning the mixture of air and fuel to produce energy. As the spend fumes leave the engine and go into the exhaust system, the exhaust gas temperature (EGT) sensors gauge their temperature. These sensors send their readings to the engine control module (ECM) or powertrain control module (PCM).

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The vehicle’s module will log a P0546 code if it gets the wrong signal from the EGT sensor.

What Does the P0546 Code Mean?

Diagnostic trouble code (DTC) P0546 indicates “Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1.”

The code covers the EGT sensor located between the exhaust manifold and catalytic converter on the same side as the engine’s cylinder bank one.

replacement egt sensor for car
The EGT sensor is a resistance temperature detector (RTD).

The EGT sensor is a resistance temperature detector (RTD). Its electrical resistance shifts in response to the temperature of the gases it is measuring.

When the temperature rises, the RTD’s electrical resistance goes up. Conversely, a drop in temperature reduces the resistance. As the resistance shifts, so does the voltage drop across the sensor’s terminals. This change is sent to the PCM.

The EGT sensor’s resistance will change according to the temperature of the exhaust gases.

If the exhaust gases are too hot, they can damage the engine or turbocharger. The PCM keeps track of these gases through the readings from the EGT sensor. It will warn the driver about excessively hot exhaust gases and take steps to prevent damage to the engine.

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The PCM regularly checks the exhaust gas temperature sensor. If the computer doesn’t get the right response, it will set the powertrain code P0546.

Note: The definition of code P0546 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0546 Code?

  • Bad EGT sensor
  • Bad PCM
  • Problem with the connectors or wiring

What are the Common Symptoms of the P0546 Code?

How to Diagnose the P0546 Code

The P0546 code is a generic powertrain code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to identify its underlying problem.

If you’re not confident about diagnosing the problem, then it’s better to take your vehicle to an auto repair shop. Otherwise, you can go ahead and diagnose the issue yourself. Here is a video that can give you an idea of what the process might involve:

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How to Fix the P0546 Code

Attempting to fix a P0546 code can become a challenging task if you don’t have the right tools and know-how to test the exhaust gas temperature sensor. In most cases, it’s best to leave the job to professionals.

But if you have the right tools, knowledge, and experience to resolve code P0546, make sure you consult a vehicle-specific repair manual or online repair database before you start.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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