AutoCodes – GMC – P0545 2017 GMC Sierra

P0545 2017 GMC Sierra 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 2017 GMC Sierra 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 158

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 2017 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 less than 158 Ω for greater than 2 s.

OBDII Code P0545 2017 GMC Sierra - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage - AutoCodes.com — P0545 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0545 2017 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 P0545 2017 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 P0545 2017 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 P0545 2017 GMC Sierra code?

Need more information on how to fix the P0545 2017 GMC Sierra code? Get Access to Factory Service Manuals

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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 2017 GMC Sierra Code

What does the OBDII code P0545 mean on a 2017 GMC Sierra?

The P0545 code indicates a low voltage issue in the Exhaust Gas Temperature (EGT) Sensor 1 circuit, which monitors exhaust temperatures to protect components and optimize emissions.

What are the symptoms of code P0545 on a 2017 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, decreased engine performance, and possible activation of limp mode.

What causes the P0545 code to appear on a 2017 GMC Sierra?

Common causes include a faulty EGT sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning engine control module (ECM).

Can I drive my 2017 GMC Sierra with the P0545 code?

While the vehicle may still be drivable, it is not recommended as it could lead to increased emissions, reduced performance, or further damage to exhaust-related components.

How do I diagnose the P0545 code on a 2017 GMC Sierra?

Start by inspecting the EGT sensor, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the sensor circuit.

How do I fix the P0545 code on a 2017 GMC Sierra?

Repairs may include replacing the EGT sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or updating/reprogramming the ECM if needed.

Where is the Exhaust Gas Temperature Sensor 1 located on a 2017 GMC Sierra?

The EGT Sensor 1 is typically located in the exhaust system before the diesel particulate filter (DPF) or catalytic converter.

How much does it cost to fix the P0545 code on a 2017 GMC Sierra?

Repairs can range from $100 to $300 for sensor replacement, while wiring repairs or ECM reprogramming may increase costs.

Can a faulty EGT sensor affect emissions on a 2017 GMC Sierra?

Yes, a malfunctioning EGT sensor can lead to improper exhaust temperature readings, affecting emissions control and potentially causing the vehicle to fail emissions testing.

Is the P0545 code specific to diesel engines on the 2017 GMC Sierra?

Yes, this code is commonly associated with diesel engines, as they rely on EGT sensors for accurate exhaust temperature monitoring in emissions systems.