AutoCodes – GMC – P0545 GMC

P0545 GMC Code - Exhaust Gas Temperature Sensor 1 Circuit Low 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: P0545 GMC indicates Exhaust Gas Temperature Sensor 1 Circuit Low 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 1,993

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 P0545 GMC 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 less than 158 Ω for greater than 2 s.

OBDII Code P0545 GMC - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage - AutoCodes.com — P0545 GMC Code - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0545 GMC?

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 P0545 GMC?

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 P0545 GMC 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 P0545 GMC code?

Need more information on how to fix the P0545 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0545 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0545 2014 GMC Sierra — Exhaust Gas Temperature Sensor 1 Circuit Low Voltage
P0545 2015 GMC Sierra — Exhaust Gas Temperature Sensor 1 Circuit Low Voltage
P0545 2016 GMC Sierra — Exhaust Gas Temperature Sensor 1 Circuit Low Voltage
P0545 2017 GMC Sierra — Exhaust Gas Temperature Sensor 1 Circuit Low Voltage
P0545 2018 GMC Sierra — Exhaust Gas Temperature Sensor 1 Circuit Low Voltage

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 P0545 GMC Code

1. What are the common symptoms of OBDII code P0545 related to the Exhaust Gas Temperature Sensor 1 Circuit Low Voltage?

The common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0545 in a GMC vehicle?

Possible causes include a faulty exhaust gas temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

3. How can I diagnose the cause of OBDII code P0545 in my GMC vehicle?

You can use a diagnostic scanner to read the code and perform testing on the exhaust gas temperature sensor and its circuit using a multimeter to pinpoint the issue.

4. Can driving with OBDII code P0545 cause further damage to my GMC vehicle?

Continued driving with this code may lead to potential damage to the engine or emissions system, so it is recommended to address the issue promptly.

5. What are some repair tips for resolving OBDII code P0545 in a GMC vehicle?

Start by inspecting the exhaust gas temperature sensor and its wiring for any visible damage. If necessary, replace the sensor and repair any damaged wiring or connectors.

6. Is it safe to drive my GMC vehicle with OBDII code P0545 if I haven't noticed any symptoms?

While it may seem safe if no symptoms are present, it is still recommended to address the issue promptly to prevent any potential damage to the engine or emissions system.

7. How much does it typically cost to repair OBDII code P0545 in a GMC vehicle?

The cost can vary depending on the extent of the issue and whether you perform the repairs yourself or take your vehicle to a mechanic. Generally, the cost can range from $100 to $300.

8. Can resetting the Check Engine Light clear OBDII code P0545 in a GMC vehicle?

Resetting the light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle.

9. Are there any DIY solutions for fixing OBDII code P0545 in a GMC vehicle?

If you have the necessary tools and expertise, you can attempt to replace the exhaust gas temperature sensor yourself. However, it is recommended to consult a professional if you are unsure.

10. How long does it typically take to repair OBDII code P0545 in a GMC vehicle?

The repair time can vary depending on the complexity of the issue and your experience level. On average, it may take 1-2 hours for a professional mechanic to diagnose and repair the problem.