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P0545 2016 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage

Quick Answer

The P0545 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Exhaust Gas Temperature (EGT) Sensor 1 Circuit registering a low voltage. Common causes include Faulty Exhaust Gas Temperature (EGT) sensor, Damaged or contaminated EGT sensor, Wiring harness issues (breaks, shorts, corrosion). 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 2016 GMC Sierra indicates Exhaust Gas Temperature Sensor 1 Circuit Low Voltage.
Common causes
Common causes include Faulty Exhaust Gas Temperature (EGT) sensor, Damaged or contaminated EGT sensor, Wiring harness issues (breaks, shorts, corrosion).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P0545 2016 GMC Sierra Description

The P0545 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Exhaust Gas Temperature (EGT) Sensor 1 Circuit registering a low voltage. This sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. The EGT sensor plays a crucial role in ensuring the engine operates efficiently and within safe parameters. When the EGT sensor detects low voltage, it indicates that the exhaust gas temperature is lower than expected, which can lead to various issues.

OBDII Code P0545 2016 GMC Sierra - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage
P0545 2016 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Circuit Low Voltage

Common Causes of P0545 2016 GMC Sierra

  1. Faulty Exhaust Gas Temperature (EGT) sensor
  2. Damaged or contaminated EGT sensor
  3. Wiring harness issues (breaks, shorts, corrosion)
  4. Poor electrical connection at the EGT sensor
  5. ECM software or hardware issues

Symptoms of P0545 2016 GMC Sierra

  1. Check engine light illuminated on the dashboard
  2. Reduced engine power and performance
  3. Decreased fuel efficiency
  4. Increased emissions
  5. Rough idling or stalling

How to Fix P0545 2016 GMC Sierra

  1. Begin by diagnosing the root cause of the low voltage reading, which may involve testing the EGT sensor, wiring, and connectors for faults.
  2. If the EGT sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
  3. Inspect the wiring harness for any damage or corrosion, repairing or replacing any affected wires as needed.
  4. Check the electrical connections at the EGT sensor and ECM to ensure they are secure and free of debris.
  5. Clear the DTC with a scan tool after completing the repairs and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0545 2016 GMC Sierra

The typical repair costs for addressing a P0545 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing the Exhaust Gas Temperature (EGT) sensor and addressing any wiring issues can range from $150 to $400, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local shops for a more accurate estimate tailored to your situation. Auto repair shops commonly charge between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas, and lower at independent shops.

What does this mean?

Tech Notes for P0545 2016 GMC Sierra

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.

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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 2016 GMC Sierra Code

1. What does the OBDII code P0545 mean on a 2016 GMC Sierra?

P0545 indicates that the Engine Control Module (ECM) has detected low voltage in the Exhaust Gas Temperature (EGT) Sensor 1 Circuit, which monitors exhaust temperatures to optimize emissions and engine performance.

2. What are the symptoms of a P0545 code on a 2016 GMC Sierra?

Common symptoms include the check engine light turning on, reduced fuel efficiency, increased emissions, potential engine performance issues, and possibly the vehicle entering limp mode.

3. What causes the P0545 code on a 2016 GMC Sierra?

Potential causes include a faulty EGT sensor, damaged wiring or connectors in the EGT sensor circuit, a short to ground, or a malfunctioning ECM.

4. Can I drive my 2016 GMC Sierra with a P0545 code?

While it may be possible to drive the vehicle, it is not recommended. Prolonged driving with this code can lead to higher emissions, reduced engine efficiency, and potential damage to the exhaust system.

5. How do you diagnose a P0545 code on a 2016 GMC Sierra?

Diagnosis involves visually inspecting the EGT sensor and its wiring for damage, testing sensor resistance with a multimeter, checking for continuity in the circuit, and using a scan tool to monitor sensor readings.

6. How do you fix the P0545 code on a 2016 GMC Sierra?

Repairs may involve replacing the faulty EGT sensor, repairing or replacing damaged wiring or connectors, or updating/reprogramming the ECM if necessary.

7. How much does it cost to fix a P0545 code on a 2016 GMC Sierra?

The cost can vary, but replacing the EGT sensor typically ranges from $100 to $300, including parts and labor. Wiring repairs or ECM reprogramming can add to the cost.

8. Can a dirty exhaust system cause the P0545 code on a 2016 GMC Sierra?

A dirty or clogged exhaust system is not a direct cause of this code, but it can contribute to sensor issues if excessive soot or debris damages the sensor.

9. How can I prevent the P0545 code from recurring on my 2016 GMC Sierra?

Regular maintenance, including checking and cleaning sensor connections, using quality fuel, and addressing exhaust system issues promptly, can help prevent this code.

10. Does the P0545 code affect emissions testing on a 2016 GMC Sierra?

Yes, this code can cause your vehicle to fail emissions testing because the EGT sensor is critical for monitoring and controlling emissions.

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