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P16E4 2017 GMC Sierra Code - Sensor Communication Circuit 3 Low Voltage

Quick Answer

The P16E4 diagnostic trouble code (DTC) indicates a problem with the communication circuit of a specific sensor, referred to as "Sensor Communication Circuit 3," in a 2017 GMC Sierra. Common causes include Wiring Issues: Damaged, frayed, or corroded wiring in the sensor communication circuit can lead to low voltage readings, Faulty Sensor: The sensor itself may be malfunctioning or have internal issues that prevent proper communication, Poor Connections: Loose or corroded connectors can disrupt the flow of electrical signals, causing low voltage conditions. 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 2017 GMC Sierra indicates Sensor Communication Circuit 3 Low Voltage.
Common causes
Common causes include Wiring Issues: Damaged, frayed, or corroded wiring in the sensor communication circuit can lead to low voltage readings, Faulty Sensor: The sensor itself may be malfunctioning or have internal issues that prevent proper communication, Poor Connections: Loose or corroded connectors can disrupt the flow of electrical signals, causing low voltage conditions.
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 Oct 08, 2024
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Code P16E4 2017 GMC Sierra Description

The P16E4 diagnostic trouble code (DTC) indicates a problem with the communication circuit of a specific sensor, referred to as "Sensor Communication Circuit 3," in a 2017 GMC Sierra. This code typically signifies that the voltage level in the communication circuit is lower than the expected range, which can disrupt the normal operation of the vehicle's electronic systems.

OBDII Code P16E4 2017 GMC Sierra - Sensor Communication Circuit 3 Low Voltage
P16E4 2017 GMC Sierra Code - Sensor Communication Circuit 3 Low Voltage

Common Causes of P16E4 2017 GMC Sierra

  1. Wiring Issues: Damaged, frayed, or corroded wiring in the sensor communication circuit can lead to low voltage readings.
  2. Faulty Sensor: The sensor itself may be malfunctioning or have internal issues that prevent proper communication.
  3. Poor Connections: Loose or corroded connectors can disrupt the flow of electrical signals, causing low voltage conditions.
  4. Power Supply Problems: Insufficient voltage from the vehicle's power supply can affect the sensor's ability to communicate effectively.
  5. Environmental Factors: Moisture or contaminants entering the sensor or wiring can lead to electrical shorts or corrosion.

Symptoms of P16E4 2017 GMC Sierra

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Erratic Engine Performance: The vehicle may exhibit rough idling, stalling, or hesitation during acceleration due to incorrect sensor readings.
  3. Decreased Fuel Efficiency: A malfunctioning sensor can lead to improper fuel-air mixture, resulting in reduced fuel economy.
  4. Increased Emissions: The vehicle may fail emissions tests due to improper readings affecting the engine's combustion process.
  5. Diagnostic Scan Tool Readings: When using a scan tool, additional codes may be present, indicating related sensor or circuit issues.

How to Fix P16E4 2017 GMC Sierra

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with Sensor Communication Circuit 3 for signs of damage, corrosion, or loose connections.
  2. Test Voltage Levels: Use a multimeter to measure the voltage levels at the sensor and the ECM to confirm low voltage readings and identify the source of the issue.
  3. Repair or Replace Wiring: If damaged wiring is found, repair or replace the affected sections to restore proper electrical flow.
  4. Sensor Replacement: If the sensor is determined to be faulty, replace it with a new, OEM-quality part to ensure compatibility and reliability.
  5. Clear Codes and Test Drive: After repairs, clear the DTCs using a scan tool and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P16E4 2017 GMC Sierra

The cost to diagnose and repair a P16E4 code can vary widely based on several factors, including the specific nature of the problem, the cost of replacement parts, and labor rates in your area. On average, you can expect to pay between $100 and $300 for repairs. This estimate typically includes parts, such as a new sensor (which can range from $50 to $150) and labor costs, which can vary from $80 to $150 per hour. Keep in mind that labor rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. It's advisable to obtain quotes from local repair shops for a more accurate estimate based on your specific situation.

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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 2017 GMC Sierra Code

What does the OBDII code P16E4 mean on a 2017 GMC Sierra?

Code P16E4 indicates a "Sensor Communication Circuit 3 Low Voltage," meaning there is an issue with the voltage signal in one of the communication circuits used by the vehicle's sensors.

What are common symptoms of code P16E4 in a 2017 GMC Sierra?

Symptoms may include warning lights on the dashboard, reduced engine performance, issues with sensor data readings, or erratic engine behavior.

What causes the P16E4 code in a 2017 GMC Sierra?

Common causes include damaged wiring, loose connectors, a faulty sensor, or issues with the circuit itself, such as corrosion or short circuits.

Can a faulty sensor trigger the P16E4 code?

Yes, a malfunctioning sensor that uses communication circuit 3 can result in low voltage and trigger this code.

How can I diagnose the P16E4 code on my GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, then check the affected sensor's voltage readings using a multimeter or diagnostic tool.

Can driving with the P16E4 code cause further damage?

It’s possible, as the vehicle might not operate with optimal sensor data, leading to reduced performance or strain on other components.

How do I fix the P16E4 code on a 2017 GMC Sierra?

Repairs may include replacing damaged wiring, cleaning connectors, or replacing the faulty sensor causing the low voltage issue.

Do I need a professional to fix the P16E4 code?

While some fixes, like checking connectors, can be done at home, a professional may be required for advanced diagnostics or sensor replacement.

Can a software update fix the P16E4 code?

In rare cases, a software update may resolve communication issues, but most often, the problem is hardware-related.

What tools are needed to address the P16E4 code?

You may need a diagnostic scanner, a multimeter, and basic automotive tools to inspect and repair wiring or replace sensors.

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