AutoCodes – GMC – P16AD GMC

P16AD GMC 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 GMC 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 1,115

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 Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16AD GMC 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 GMC - Glow Plug Control Module Temperature Sensor Circuit Low Voltage - AutoCodes.com — P16AD GMC Code - Glow Plug Control Module Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P16AD GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the P16AD GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P16AD 2014 GMC Sierra — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2015 GMC Sierra — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2016 GMC Sierra — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2017 GMC Sierra — Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2018 GMC Sierra — 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 GMC Code

1. What are the common symptoms of OBDII code P16AD GMC?

- Common symptoms include hard starting, rough idling, reduced engine performance, and the illumination of the check engine light.

2. What causes the Glow Plug Control Module Temperature Sensor Circuit Low Voltage fault code?

- This code is typically triggered by a malfunction in the glow plug control module temperature sensor or issues with the wiring and connectors associated with the sensor.

3. How can I diagnose the P16AD GMC code?

- Diagnosing this code involves inspecting the glow plug control module temperature sensor, checking the wiring for any damage, and testing the sensor's resistance and voltage readings.

4. Can a faulty glow plug cause the P16AD code to appear?

- While a faulty glow plug itself may not directly trigger this code, it can contribute to issues within the glow plug control module system that may lead to the appearance of the P16AD fault code.

5. What are the repair options for addressing the Glow Plug Control Module Temperature Sensor Circuit Low Voltage code?

- Repair options may include replacing the faulty temperature sensor, repairing or replacing damaged wiring and connectors, or resetting the fault code after addressing any underlying issues.

6. Is it safe to continue driving with the P16AD GMC fault code present?

- It is not recommended to continue driving with this fault code present, as it can lead to potential engine performance issues and further damage if left unaddressed.

7. How much does it typically cost to repair the Glow Plug Control Module Temperature Sensor Circuit Low Voltage issue?

- The cost of repair can vary depending on the extent of the problem and the specific components that need to be replaced. It is advisable to consult a professional mechanic for an accurate cost estimate.

8. Can I clear the P16AD code with an OBDII scanner, or does it require professional intervention?

- You can attempt to clear the P16AD code with an OBDII scanner, but it is important to address the underlying cause of the fault to prevent the code from reappearing.

9. Are there any preventive maintenance measures to avoid the P16AD fault code in the future?

- Regularly inspecting the glow plug control module system, including the temperature sensor and associated wiring, can help identify potential issues early and prevent the occurrence of the P16AD fault code.

10. Will the P16AD GMC code affect the vehicle's emissions or fuel efficiency?

- Yes, the P16AD fault code can impact emissions and fuel efficiency by causing the engine to run inefficiently and potentially emitting higher levels of pollutants.