AutoCodes – GMC – P163C GMC

P163C GMC Code - Glow Plug Control Module Primary Circuit

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the voltage and output state of the glow plugs. Common causes include Faulty Glow Plug Control Module, 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
P163C GMC indicates Glow Plug Control Module Primary Circuit.
Common causes
Common causes include Faulty Glow Plug Control Module, 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 4,593
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 24, 2021
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Code P163C GMC Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the voltage and output state of the glow plugs. The GPCM monitors the battery voltage of the module's main voltage supply circuit, the Ignition 1 Signal circuit, and the Engine Control Module (ECM) Voltage circuit. If the GPCM detects a difference between the GPCM main battery supply circuit and the Ignition 1 Signal circuit greater than 5 V the DTC will set or if the GPCM detects a difference of 3 V between the GPCM main battery supply circuit and the ECM Voltage circuit. The GPCM will send a message to the ECM to set this Diagnostic Trouble Code (DTC).
OBDII Code P163C GMC - Glow Plug Control Module Primary Circuit - AutoCodes.com
P163C GMC Code - Glow Plug Control Module Primary Circuit

What are the Possible Causes of the DTC P163C GMC?

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

How to Fix the DTC P163C 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 P163C 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 P163C GMC code?

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Need Help with the Code?

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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 P163C GMC Code

1. What are the common symptoms of OBDII code P163C GMC related to the Glow Plug Control Module Primary Circuit?

The common symptoms include hard starting, rough idling, loss of power, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P163C GMC indicating an issue with the Glow Plug Control Module Primary Circuit?

Possible causes may include a faulty glow plug control module, damaged wiring or connectors, a defective glow plug relay, or a problem with the glow plugs themselves.

3. How can I diagnose the cause of OBDII code P163C GMC concerning the Glow Plug Control Module Primary Circuit?

Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, testing the glow plug control module and related components for functionality, and inspecting the wiring for any signs of damage or corrosion.

4. Can I continue driving my vehicle with OBDII code P163C GMC until I repair the issue with the Glow Plug Control Module Primary Circuit?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

5. Are there any DIY repair tips for addressing OBDII code P163C GMC linked to the Glow Plug Control Module Primary Circuit?

DIY repair tips may include checking and cleaning the connectors and wiring related to the glow plug system, testing the glow plugs for proper functioning, and replacing the glow plug control module if necessary.

6. How much does it typically cost to repair OBDII code P163C GMC associated with the Glow Plug Control Module Primary Circuit?

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

7. Can a faulty glow plug control module cause other issues in the vehicle besides triggering OBDII code P163C GMC?

Yes, a faulty glow plug control module can lead to issues such as decreased fuel efficiency, increased emissions, and potential damage to the engine if not addressed promptly.

8. Is it possible for OBDII code P163C GMC to reoccur even after repairs have been made to the Glow Plug Control Module Primary Circuit?

Yes, in some cases, the code may reoccur if the underlying issue was not completely resolved during the initial repair. It is important to ensure that all related components are thoroughly inspected and repaired.

9. How long does it typically take to repair OBDII code P163C GMC associated with the Glow Plug Control Module Primary Circuit?

The repair time can vary depending on the complexity of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the problem.

10. Can a malfunctioning glow plug control module affect the overall performance of the vehicle in addition to triggering OBDII code P163C GMC?

Yes, a malfunctioning glow plug control module can impact the overall performance of the vehicle by causing issues such as reduced engine power, decreased fuel efficiency, and increased emissions.

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