AutoCodes – Chevrolet – P16AD Chevrolet

P16AD Chevrolet Code - Glow Plug Control Module Temperature Sensor Circuit Low 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: P16AD Chevrolet indicates Glow Plug Control Module Temperature Sensor Circuit Low 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 1,639

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 P16AD Chevrolet 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 P16AD Chevrolet - Glow Plug Control Module Temperature Sensor Circuit Low Voltage - AutoCodes.com — P16AD Chevrolet Code - Glow Plug Control Module Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P16AD Chevrolet?

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 P16AD Chevrolet?

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 P16AD Chevrolet 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 P16AD Chevrolet code?

Need more information on how to fix the P16AD Chevrolet code? Get Access to Factory Service Manuals

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Information for Specific Chevrolet Models

P16AD 2014 Chevrolet Silverado — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2015 Chevrolet Silverado — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2016 Chevrolet Silverado — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2017 Chevrolet Silverado — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2018 Chevrolet Silverado — Glow Plug Control Module Temperature Sensor Circuit Low Voltage

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 P16AD Chevrolet Code

1. What does the OBDII code P16AD mean on a Chevrolet?

Code P16AD indicates a low voltage issue in the Glow Plug Control Module Temperature Sensor Circuit, which monitors the glow plug system's temperature for proper operation.

2. What are the symptoms of the P16AD code on a Chevrolet?

Common symptoms include the check engine light turning on, hard starting in cold weather, reduced engine performance, and possible illumination of glow plug-related warning lights.

3. What causes the P16AD code to appear?

Potential causes include a faulty glow plug control module, damaged or corroded wiring in the temperature sensor circuit, a failed temperature sensor, or poor electrical connections.

4. Can a bad glow plug cause the P16AD code?

While a bad glow plug itself might not directly cause this code, issues with the glow plug control module or its temperature sensor circuit can trigger it.

5. How do I diagnose the P16AD code on my Chevrolet?

Start by checking the wiring and connections in the temperature sensor circuit for damage or corrosion. Use a multimeter to test the sensor's voltage and resistance, and inspect the glow plug control module for faults.

6. Can I drive with the P16AD code on my Chevrolet?

Driving with this code is not recommended, especially in cold weather, as it may lead to difficult starting conditions and reduced engine efficiency.

7. How do I fix the P16AD code on a Chevrolet?

Repairs may involve replacing the glow plug control module, fixing damaged wiring or connectors, or replacing the temperature sensor if it is faulty.

8. How much does it cost to repair the P16AD code on a Chevrolet?

Repair costs vary but typically range from $150 to $500, depending on whether you need to replace the module, sensor, or repair wiring.

9. Can a software update fix the P16AD code?

In some cases, a software update for the engine control module (ECM) may resolve the issue if the problem is related to incorrect parameters or calibration.

10. How can I prevent the P16AD code from recurring?

Regularly inspect and maintain the wiring, connectors, and glow plug system components. Address any electrical issues promptly to prevent further damage.