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P16E4 2018 GMC Sierra Code - Sensor Communication Circuit 3 Low Voltage

Quick Answer

The diagnostic trouble code P16E4 for a 2018 GMC Sierra refers to an issue with the Sensor Communication Circuit 3, specifically indicating low voltage. Common causes include Faulty sensor, Wiring or connector issues, Corrosion or damage to the sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P16E4 2018 GMC Sierra indicates Sensor Communication Circuit 3 Low Voltage.
Common causes
Common causes include Faulty sensor, Wiring or connector issues, Corrosion or damage to the sensor circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 20, 2024
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Code P16E4 2018 GMC Sierra Description

The diagnostic trouble code P16E4 for a 2018 GMC Sierra refers to an issue with the Sensor Communication Circuit 3, specifically indicating low voltage. This code typically means that there is a problem with the communication between the sensor and the vehicle's control module. This can affect the vehicle's performance by causing issues with engine management, emissions control, and overall drivability. The sensor in question may be related to various systems in the vehicle, such as the fuel injection system, transmission, or exhaust gas recirculation.

OBDII Code P16E4 2018 GMC Sierra - Sensor Communication Circuit 3 Low Voltage
P16E4 2018 GMC Sierra Code - Sensor Communication Circuit 3 Low Voltage

Common Causes of P16E4 2018 GMC Sierra

  1. Faulty sensor
  2. Wiring or connector issues
  3. Corrosion or damage to the sensor circuit
  4. Problems with the vehicle's control module
  5. Electrical issues such as a short circuit or voltage irregularities

Symptoms of P16E4 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard
  2. Poor acceleration or hesitation during acceleration
  3. Rough idling or stalling
  4. Reduced fuel efficiency
  5. Transmission shifting issues

How to Fix P16E4 2018 GMC Sierra

  1. Perform a thorough inspection of the sensor circuit, wiring, and connectors for any visible damage or corrosion.
  2. Test the sensor and its communication with the control module using a multimeter or diagnostic tool.
  3. Replace the sensor if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P16E4 2018 GMC Sierra

The cost of repairing a Sensor Communication Circuit 3 low voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. Typically, you can expect to pay anywhere from $100 to $300 for parts and labor for this type of repair. However, it is advisable to obtain quotes from local auto repair shops to get a more accurate estimate based on your location and vehicle model. Remember that rates may vary based on the complexity of the repair and the expertise of the technician.

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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 P16E4 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P16E4 in a 2018 GMC Sierra?

The common symptoms of code P16E4 "Sensor Communication Circuit 3 Low Voltage" in a 2018 GMC Sierra may include rough idling, poor engine performance, and illuminated check engine light.

2. What can cause the OBDII code P16E4 to trigger in a 2018 GMC Sierra?

The P16E4 code in a 2018 GMC Sierra is typically triggered by a malfunction in the sensor communication circuit 3, leading to lower than normal voltage levels.

3. How serious is the OBDII code P16E4 "Sensor Communication Circuit 3 Low Voltage" in a 2018 GMC Sierra?

While the code itself may not cause immediate driving issues, it is important to address it promptly to prevent potential long-term damage to the vehicle's systems.

4. How can I diagnose the OBDII code P16E4 in my 2018 GMC Sierra?

Diagnosing the P16E4 code usually involves using an OBDII scanner to read the code, followed by inspecting the sensor communication circuit 3 for any wiring issues or sensor malfunctions.

5. What are some DIY repair tips for fixing OBDII code P16E4 in a 2018 GMC Sierra?

DIY repair tips for addressing the P16E4 code may include checking and repairing any damaged wiring in the sensor communication circuit 3 or replacing the faulty sensor causing the low voltage.

6. Can I continue driving my 2018 GMC Sierra with the OBDII code P16E4 present?

While it may be possible to continue driving with the code present, it is advisable to address the issue promptly to prevent potential performance issues and further damage to the vehicle.

7. Will resetting the OBDII code P16E4 in my 2018 GMC Sierra make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P16E4 code is not fixed, it is likely to reappear.

8. Is it safe to clear the OBDII code P16E4 using an OBDII scanner in my 2018 GMC Sierra?

Clearing the code using an OBDII scanner is safe and a common practice, but remember that it will not fix the underlying issue causing the P16E4 code to trigger.

9. How much does it cost to repair OBDII code P16E4 in a 2018 GMC Sierra?

The cost of repairing the P16E4 code can vary depending on the specific cause, such as wiring repairs or sensor replacement. It is recommended to consult a mechanic for an accurate estimate.

10. Can a faulty battery or alternator cause the OBDII code P16E4 to appear in a 2018 GMC Sierra?

While a faulty battery or alternator can cause electrical issues in a vehicle, they are less likely to directly trigger the P16E4 code. Focus on diagnosing the sensor communication circuit 3 for this specific code.

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