AutoCodes – GMC – P16A8 GMC

P16A8 GMC Code - Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible

Quick Answer

The glow plug control module has the ability to perform internal diagnostics for voltage and output state of the glow plugs. Common causes include Faulty Glow Plug Control Module Temperature, Glow Plug Control Module Temperature harness is open or shorted, Glow Plug Control Module Temperature 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: P16A8 GMC indicates Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible.
Common causes: Common causes include Faulty Glow Plug Control Module Temperature, Glow Plug Control Module Temperature harness is open or shorted, Glow Plug Control Module Temperature 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 15,121

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 Jan 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P16A8 GMC Description

The glow plug control module has the ability to perform internal diagnostics for voltage and output state of the glow plugs. If the difference between the internal temperature of the glow plug control module and the internal temperature of the intake air heater module is greater than 20°C (68°F), this DTC will set. The glow plug control module will send a message to the Engine Control Module (ECM) to set this DTC.

OBDII Code P16A8 GMC - Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible - AutoCodes.com — P16A8 GMC Code - Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible

What does this mean?

What are the Possible Causes of the DTC P16A8 GMC?

Faulty Glow Plug Control Module Temperature
Glow Plug Control Module Temperature harness is open or shorted
Glow Plug Control Module Temperature circuit poor electrical connection

How to Fix the DTC P16A8 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 P16A8 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 P16A8 GMC code?

Need more information on how to fix the P16A8 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16A8 GMC code diagnosed by a professional: Find a repair shop in your area

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 P16A8 GMC Code

1. What are the common symptoms of OBDII code P16A8 in a GMC vehicle?

- Common symptoms include rough idling, decreased engine performance, poor fuel economy, and the Check Engine light illuminated on the dashboard.

2. What does the OBDII code P16A8 indicate in a GMC vehicle?

- The code P16A8 indicates a potential issue with the Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible in the vehicle.

3. What are the possible causes of OBDII code P16A8 in a GMC vehicle?

- Possible causes include a faulty glow plug control module, damaged intake air heater, wiring issues, or a malfunctioning temperature sensor.

4. How can I diagnose the OBDII code P16A8 in my GMC vehicle?

- Diagnosis involves using an OBDII scanner to retrieve the code, checking the glow plug control module, intake air heater, temperature sensor, and inspecting the wiring for any damage.

5. Can I continue driving my GMC vehicle with OBDII code P16A8?

- It is not recommended to continue driving the vehicle with this code as it can lead to further damage and worsen engine performance.

6. How can I repair OBDII code P16A8 in my GMC vehicle?

- Repair involves replacing the faulty glow plug control module, intake air heater, temperature sensor, or repairing any damaged wiring as necessary.

7. Are there any DIY tips for fixing OBDII code P16A8 in a GMC vehicle?

- While some may attempt to diagnose the issue themselves, it is recommended to seek professional help for accurate diagnosis and repair of this code.

8. Can a faulty glow plug cause OBDII code P16A8 in a GMC vehicle?

- Yes, a faulty glow plug can contribute to triggering the code P16A8 in a GMC vehicle due to its impact on the overall temperature control system.

9. How much does it cost to repair OBDII code P16A8 in a GMC vehicle?

- The cost of repairing this code can vary depending on the specific issue, parts needed, labor costs, and whether the repair is done at a dealership or an independent mechanic.

10. How long does it typically take to repair OBDII code P16A8 in a GMC vehicle?

- The repair time can vary based on the complexity of the issue, availability of parts, and the mechanic's expertise, but it generally takes a few hours to a day to address this code.