AutoCodes – Buick – P16AD Buick

P16AD Buick 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 Buick 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 320

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

What does this mean?

What are the Possible Causes of the DTC P16AD Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What does the OBDII code P16AD mean for a Buick?

P16AD indicates a low voltage issue in the Glow Plug Control Module Temperature Sensor Circuit, which monitors the temperature of the glow plugs for proper operation.

2. What are the common symptoms of a P16AD code in a Buick?

Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, an illuminated check engine light, or rough idling.

3. What causes the P16AD code to appear?

Common causes include a faulty glow plug control module temperature sensor, wiring issues such as damaged or corroded connectors, or a malfunctioning glow plug control module.

4. Can I drive my Buick with the P16AD code?

While the vehicle may still be drivable, ignoring the code can lead to starting issues in cold weather and potentially worsen engine performance over time.

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

Diagnosis typically involves using an OBDII scanner to confirm the code, visually inspecting wiring and connectors, and testing the glow plug control module temperature sensor for proper operation.

6. How do I fix the P16AD code in my Buick?

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

7. How much does it cost to fix a P16AD code on a Buick?

Repair costs can vary but typically range from $100 to $500 depending on the specific issue, parts needed, and labor costs.

8. Can a bad battery cause the P16AD code?

While unlikely, a weak or failing battery can sometimes contribute to low voltage issues, so itâ€™s worth checking the battery health.

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

Regular maintenance, inspecting wiring and connectors for damage, and ensuring the glow plug system is in good condition can help prevent this code.

10. Is the P16AD code specific to Buick vehicles?

No, the P16AD code can appear on other vehicles but is commonly associated with models that use glow plug systems, especially diesel engines. Always refer to your vehicle's manual for specific details.