AutoCodes – GMC – P16E5 2018 GMC Sierra

P16E5 2018 GMC Sierra Code - Sensor Communication Circuit 3 High Voltage

Quick Answer

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to constantly adjust the high-pressure fuel pump's feed rate so that the ideal pressure is permanently maintained in the high-pressure section (between the high-pressure fuel pump and the injectors) by means of closed-loop control. Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure harness is open or shorted. 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: P16E5 2018 GMC Sierra indicates Sensor Communication Circuit 3 High Voltage.
Common causes: Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure harness is open or shorted.
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.

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Code Popularity 232

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16E5 2018 GMC Sierra Description

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to constantly adjust the high-pressure fuel pump's feed rate so that the ideal pressure is permanently maintained in the high-pressure section (between the high-pressure fuel pump and the injectors) by means of closed-loop control. The fuel rail pressure sensor transmits fuel pressure and temperature information via serial data to the ECM. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low. The ECM controls the fuel pressure regulator, which regulates high-pressure fuel that goes to the fuel injector rails and the injectors. The Diagnostic Trouble Code (DTC) will be set if the Fuel Rail Pressure Sensor Signal is greater than a predefined threshold for greater than 2.6 s.

OBDII Code P16E5 2018 GMC Sierra - Sensor Communication Circuit 3 High Voltage - AutoCodes.com — P16E5 2018 GMC Sierra Code - Sensor Communication Circuit 3 High Voltage

What does this mean?

What are the Possible Causes of the DTC P16E5 2018 GMC Sierra?

Low or no fuel
Faulty Fuel Rail Pressure (FRP) Sensor
Fuel Rail Pressure harness is open or shorted
Fuel Rail Pressure circuit poor electrical connection
Faulty Fuel Pump

How to Fix the DTC P16E5 2018 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16E5 2018 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 P16E5 2018 GMC Sierra code?

Need more information on how to fix the P16E5 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P16E5 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P16E5 in a 2018 GMC Sierra?

- Common symptoms include rough engine idle, decreased fuel efficiency, and potential issues with vehicle acceleration.

2. What does the OBDII code P16E5 "Sensor Communication Circuit 3 High Voltage" indicate in a 2018 GMC Sierra?

- This code indicates a high voltage reading in the communication circuit of sensor 3 in the vehicle's system.

3. What are the possible causes of OBDII code P16E5 in a 2018 GMC Sierra?

- Possible causes include a faulty sensor, damaged wiring or connectors, a malfunctioning ECM, or issues with the sensor circuit.

4. How can I diagnose the issue related to OBDII code P16E5 in my 2018 GMC Sierra?

- Diagnosing the problem involves checking the wiring and connectors associated with sensor 3, testing the sensor itself, and inspecting the ECM for any faults.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P16E5 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle's systems and potentially affect its performance.

6. How can I repair OBDII code P16E5 in my 2018 GMC Sierra?

- Repairing this code may involve replacing the faulty sensor, repairing damaged wiring or connectors, resetting the ECM, or addressing any other underlying issues causing the high voltage reading.

7. Is it possible to reset the OBDII code P16E5 in a 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

8. Are there any DIY tips for troubleshooting OBDII code P16E5 in a 2018 GMC Sierra?

- DIY tips include visually inspecting the sensor and its connections, checking for any visible damage, and ensuring proper electrical connections.

9. How long does it typically take to repair OBDII code P16E5 in a 2018 GMC Sierra?

- The repair time can vary depending on the exact cause of the issue, but it usually takes a few hours to a day to diagnose and fix the problem.

10. Will fixing OBDII code P16E5 in my 2018 GMC Sierra improve the vehicle's overall performance?

- Yes, addressing this code can help restore the vehicle's performance, fuel efficiency, and overall drivability by ensuring proper sensor communication and voltage levels.