AutoCodes – Generic – P16A8

P16A8 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 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.

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Code Popularity 2,776

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

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P16A8 BMW — Engine Control Module Self-Test Throttle Position Monitoring Fault
P16A8 Chevrolet — Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible
P16A8 GMC — Glow Plug Control Module Temperature - Intake Air Heater Temperature Not Plausible
P16A8 MINI — Engine Control Module Self-Test Throttle Position Monitoring Fault

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 Code

1. What are common symptoms of OBDII code P16A8?

- Common symptoms include rough idling, reduced engine performance, and the Check Engine light illuminating on the dashboard.

2. What could be causing the OBDII code P16A8 to trigger?

- The code P16A8 may be triggered due to issues with the glow plug control module temperature or the intake air heater temperature sensors not providing plausible data.

3. How can I diagnose the OBDII code P16A8?

- Diagnosing the code typically involves checking the glow plug control module, intake air heater temperature sensors, and related wiring for any faults or damage.

4. Can I still drive my vehicle with the OBDII code P16A8 present?

- It is not recommended to drive the vehicle with the code P16A8 present, as it can lead to further engine damage or decreased fuel efficiency.

5. What are the potential repair options for OBDII code P16A8?

- Repair options may include replacing the defective glow plug control module, intake air heater temperature sensors, or repairing any damaged wiring connections.

6. Are there any DIY tips for resolving the OBDII code P16A8?

- While some basic troubleshooting like checking for loose connections can be done, it is advisable to seek professional assistance for accurate diagnosis and repair.

7. How urgent is it to address the OBDII code P16A8?

- It is important to address the code promptly to prevent further damage to the engine and ensure optimal performance of the vehicle.

8. Can extreme weather conditions affect the triggering of OBDII code P16A8?

- Yes, extreme weather conditions can affect the glow plug control module temperature and intake air heater temperature, potentially leading to the triggering of the code.

9. Will resetting the vehicle's ECU clear the OBDII code P16A8?

- Resetting the ECU may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear upon further driving.

10. Is it recommended to use a diagnostic tool to clear the OBDII code P16A8?

- It is recommended to use a diagnostic tool to clear the code after the underlying issue has been properly diagnosed and repaired to ensure the problem is fully resolved.