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P16AD 2014 GMC Sierra Code - Glow Plug Control Module Temperature Sensor Circuit Low Voltage

Quick Answer

The P16AD diagnostic trouble code (DTC) indicates that the Glow Plug Control Module (GPCM) has detected a low voltage condition in the temperature sensor circuit. Common causes include Faulty glow plug temperature sensor leading to incorrect voltage readings, Damaged wiring or connectors in the glow plug control module circuit, Malfunctioning glow plug control module itself. 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 2014 GMC Sierra indicates Glow Plug Control Module Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug temperature sensor leading to incorrect voltage readings, Damaged wiring or connectors in the glow plug control module circuit, Malfunctioning glow plug control module itself.
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 18, 2024
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Code P16AD 2014 GMC Sierra Description

The P16AD diagnostic trouble code (DTC) indicates that the Glow Plug Control Module (GPCM) has detected a low voltage condition in the temperature sensor circuit. This sensor is crucial for monitoring the temperature of the glow plugs, which are essential for starting diesel engines, especially in cold weather conditions. When the GPCM receives a voltage reading that is below the expected threshold, it triggers this code, signaling a potential issue within the glow plug system.

OBDII Code P16AD 2014 GMC Sierra - Glow Plug Control Module Temperature Sensor Circuit Low Voltage
P16AD 2014 GMC Sierra Code - Glow Plug Control Module Temperature Sensor Circuit Low Voltage

Common Causes of P16AD 2014 GMC Sierra

  1. Faulty glow plug temperature sensor leading to incorrect voltage readings.
  2. Damaged wiring or connectors in the glow plug control module circuit.
  3. Malfunctioning glow plug control module itself.
  4. Poor electrical connections due to corrosion or dirt.
  5. Short circuits or open circuits in the sensor circuit.

Symptoms of P16AD 2014 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring during initial operation.
  3. Increased exhaust emissions, potentially triggering a check engine light.
  4. Reduced fuel efficiency due to improper combustion.
  5. Engine stalling or hesitation during acceleration.

How to Fix P16AD 2014 GMC Sierra

  1. Diagnostic Verification: Begin by using a scan tool to confirm the P16AD code and check for any additional codes that may indicate related issues.
  2. Visual Inspection: Inspect the wiring and connectors associated with the glow plug temperature sensor for any signs of damage, corrosion, or loose connections.
  3. Sensor Testing: Test the glow plug temperature sensor with a multimeter to ensure it is functioning correctly and providing accurate voltage readings.
  4. Module Inspection: If the sensor is functioning properly, inspect the glow plug control module for any signs of failure or damage, and consider testing its output.
  5. Repair or Replace: Depending on the findings, repair any damaged wiring or connectors, replace the faulty temperature sensor, or replace the glow plug control module as needed.

Cost to Fix P16AD 2014 GMC Sierra

Repair costs for addressing a P16AD code can vary significantly based on the specific diagnosis and repairs required. On average, you might expect to pay between $200 and $600 for parts and labor. This estimate includes the cost of a new glow plug temperature sensor, which typically ranges from $50 to $150, and labor costs that can vary from $80 to $150 per hour. The total time for diagnosis and repair can range from 1 to 3 hours, depending on the complexity of the issue and the shop's labor rates. It is important to note that rates can be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. For a more precise estimate, it is advisable to check local repair shop rates and get a detailed quote based on your specific vehicle and 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 P16AD 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P16AD in a 2014 GMC Sierra related to the Glow Plug Control Module Temperature Sensor Circuit Low Voltage?

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

2. What are the possible causes of OBDII code P16AD in a 2014 GMC Sierra?

- The code P16AD can be triggered by issues such as a faulty glow plug control module, damaged wiring or connectors, or a malfunctioning temperature sensor.

3. How can I diagnose the Glow Plug Control Module Temperature Sensor Circuit Low Voltage issue in a 2014 GMC Sierra?

- Diagnosing the problem involves using an OBDII scanner to retrieve the fault code, conducting a visual inspection of the wiring and connectors, and testing the glow plug control module and temperature sensor.

4. Can I continue driving my 2014 GMC Sierra with OBDII code P16AD present?

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

5. What is the typical repair process for addressing OBDII code P16AD in a 2014 GMC Sierra?

- The repair process usually involves replacing the faulty glow plug control module, repairing or replacing damaged wiring or connectors, and testing the system to ensure proper functionality.

6. Are there any DIY tips for resolving OBDII code P16AD in a 2014 GMC Sierra?

- While some basic inspections and checks can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and repair of this issue.

7. How much does it cost to repair the Glow Plug Control Module Temperature Sensor Circuit Low Voltage problem in a 2014 GMC Sierra?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it typically ranges from $200 to $500.

8. Can extreme weather conditions affect the occurrence of OBDII code P16AD in a 2014 GMC Sierra?

- Yes, extreme cold temperatures can put additional strain on the glow plug system, potentially leading to issues with the temperature sensor circuit and triggering the P16AD fault code.

9. Is it possible for a software update to resolve OBDII code P16AD in a 2014 GMC Sierra?

- In some cases, a software update from the manufacturer may address certain issues related to the glow plug control module temperature sensor circuit, so it's worth checking with a dealership or authorized service center.

10. How can I prevent future occurrences of OBDII code P16AD in my 2014 GMC Sierra?

- Regular maintenance, including checking the glow plug system components, ensuring proper insulation of wiring, and addressing any issues promptly, can help prevent the recurrence of this fault code.

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