AutoCodes – GMC – P16AE 2018 GMC Sierra

P16AE 2018 GMC Sierra Code - Glow Plug Control Module Temperature Sensor Circuit High Voltage

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection. 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: P16AE 2018 GMC Sierra indicates Glow Plug Control Module Temperature Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection.
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 146

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16AE 2018 GMC Sierra Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and if the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the Engine Control Module (ECM) to set the appropriate Diagnostic Trouble Code (DTC). A DTC is detected when one of the GPCM temperature sensors voltage falls outside the calibrated threshold for greater than 1.3 s.

OBDII Code P16AE 2018 GMC Sierra - Glow Plug Control Module Temperature Sensor Circuit High Voltage - AutoCodes.com — P16AE 2018 GMC Sierra Code - Glow Plug Control Module Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P16AE 2018 GMC Sierra?

Faulty Glow Plug Control Module (GPCM)
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P16AE 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 P16AE 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 P16AE 2018 GMC Sierra 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 P16AE 2018 GMC Sierra Code

1. What does the OBDII code P16AE mean on a 2018 GMC Sierra?

P16AE indicates a high voltage issue in the Glow Plug Control Module Temperature Sensor Circuit, which monitors and regulates the glow plug system for proper engine operation.

2. What are the symptoms of the P16AE code in a 2018 GMC Sierra?

Common symptoms include difficulty starting the engine, reduced engine performance, a check engine light, poor fuel efficiency, and potential pre-glow cycle errors in cold weather.

3. What causes the P16AE code to appear?

The code can be triggered by a faulty temperature sensor, damaged wiring or connectors, a malfunctioning glow plug control module, or an electrical short or open circuit.

4. How can I diagnose the P16AE code in my GMC Sierra?

Start by checking for visible damage or corrosion in the wiring and connectors, testing the glow plug control module temperature sensor for proper resistance, and scanning for related codes to pinpoint the issue.

5. Can I still drive with the P16AE code active?

While the vehicle may still run, it could experience poor cold starting and reduced performance. Prolonged driving with this code active can lead to further damage to the glow plug system or engine components.

6. How do I fix the P16AE code on a 2018 GMC Sierra?

Common fixes include repairing or replacing damaged wiring, cleaning or replacing faulty connectors, replacing the temperature sensor, or replacing the glow plug control module if necessary.

7. How much does it cost to repair the P16AE code?

Repair costs vary depending on the issue. Replacing a temperature sensor typically costs $50â€“$150, while replacing a glow plug control module may range from $300â€“$600, including labor.

8. Can a weak battery cause the P16AE code?

Yes, a weak or failing battery can cause voltage irregularities that might trigger the P16AE code. Ensure the battery is fully charged and in good condition before further diagnostics.

9. Will clearing the P16AE code fix the issue?

Clearing the code might temporarily remove the check engine light, but it wonâ€™t fix the underlying problem. Proper diagnosis and repair are needed to resolve the issue.

10. Is the P16AE code specific to diesel engines?

Yes, the P16AE code is specific to vehicles with diesel engines, as it relates to the glow plug system used to aid cold starts in diesel applications.