AutoCodes – GMC – P0546 2015 GMC Sierra

P0546 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Circuit High Voltage

Quick Answer

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 1, Exhaust Gas Temperature Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0546 2015 GMC Sierra indicates Exhaust Gas Temperature Sensor 1 Circuit High Voltage.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 1, Exhaust Gas Temperature Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 448

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 03, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0546 2015 GMC Sierra Description

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Exhaust temperature sensor 1 is the first exhaust temperature sensor in the exhaust system, the following exhaust temperature sensors are counted upward from the engine outlet to the exhaust system end. The Engine Control Module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The Diagnostic Trouble Code (DTC) will ve set when the ECM detects that the exhaust gas temperature sensor is greater than 900 Ω for greater than 2 s.

OBDII Code P0546 2015 GMC Sierra - Exhaust Gas Temperature Sensor 1 Circuit High Voltage - AutoCodes.com — P0546 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0546 2015 GMC Sierra?

Faulty Exhaust Gas Temperature Sensor (EGTS) 1
Exhaust Gas Temperature Sensor 1 harness is open or shorted
Exhaust Gas Temperature Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0546 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

After starting the engine, the exhaust gas temperature sensor temperature should rise steadily, then stabilize after the engine reaches operating temperature. Exhaust gas temperature sensors may fail intermittently while operating under extreme temperatures. Review the Freeze Frame/Failure Records to verify the failure criteria.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0546 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0546 2015 GMC Sierra code?

Need more information on how to fix the P0546 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0546 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0546 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P0546 in a 2015 GMC Sierra?

Symptoms may include reduced engine performance, decreased fuel efficiency, rough idling, and the illumination of the check engine light.

2. What could cause the Exhaust Gas Temperature Sensor 1 Circuit High Voltage error code in a 2015 GMC Sierra?

Possible causes of P0546 include a faulty exhaust gas temperature sensor, damaged wiring or connectors related to the sensor, or issues with the sensor's circuit.

3. How can I diagnose the Exhaust Gas Temperature Sensor 1 Circuit High Voltage issue in my 2015 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to retrieve the specific error code, inspecting the sensor and its connections for damage or corrosion, and testing the sensor's functionality.

4. Can driving with OBDII code P0546 in a 2015 GMC Sierra cause further damage to the vehicle?

Continuing to drive with this code present can potentially lead to increased emissions, reduced engine efficiency, and in some cases, damage to the catalytic converter or other engine components.

5. Is it safe to continue driving my 2015 GMC Sierra with the check engine light on due to code P0546?

While the vehicle may still be operable, it is recommended to address the issue promptly to prevent any further complications and to ensure optimal engine performance.

6. How can I repair the Exhaust Gas Temperature Sensor 1 Circuit High Voltage problem in my 2015 GMC Sierra?

Repair options may include replacing the faulty exhaust gas temperature sensor, repairing or replacing damaged wiring/connectors, or addressing any issues with the sensor's circuit.

7. Are there any DIY tips for fixing OBDII code P0546 in a 2015 GMC Sierra?

DIY enthusiasts with automotive experience may attempt to replace the exhaust gas temperature sensor themselves, following manufacturer instructions and safety precautions.

8. Will resetting the check engine light resolve the P0546 error code in a 2015 GMC Sierra?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing P0546 is not addressed, the code is likely to reappear after driving cycles.

9. How much does it typically cost to repair OBDII code P0546 in a 2015 GMC Sierra at a professional mechanic or dealership?

Costs can vary depending on the exact cause of the issue, but repairs for this code may range from $200 to $500, including parts and labor.

10. Can a malfunctioning Exhaust Gas Temperature Sensor 1 impact the overall performance of a 2015 GMC Sierra?

Yes, a faulty exhaust gas temperature sensor can affect engine performance, fuel efficiency, emissions output, and overall drivability of the vehicle.