AutoCodes – Cadillac – P163C Cadillac

P163C Cadillac 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 Cadillac 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 319

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 Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P163C Cadillac 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 Cadillac - Glow Plug Control Module Primary Circuit - AutoCodes.com — P163C Cadillac Code - Glow Plug Control Module Primary Circuit

What does this mean?

What are the Possible Causes of the DTC P163C Cadillac?

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 Cadillac?

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 Cadillac 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 P163C Cadillac Code

1. What does the OBDII code P163C mean on a Cadillac?

P163C indicates an issue with the Glow Plug Control Module Primary Circuit, which is responsible for regulating the glow plugs used in diesel engines for cold starts.

2. What are the common symptoms of code P163C in a Cadillac?

Symptoms include difficulty starting the engine in cold weather, reduced fuel efficiency, and possible illumination of the check engine light.

3. What causes the P163C code on a Cadillac?

Typical causes include a faulty glow plug control module, wiring issues such as damaged or corroded connectors, or failed glow plugs.

4. Can driving with the P163C code damage my Cadillac?

Driving with this code may lead to harder starts in cold weather but typically won't cause immediate damage. Prolonged neglect could lead to further electrical or engine issues.

5. How do I diagnose the P163C code on my Cadillac?

Begin by visually inspecting the wiring and connectors to the glow plug control module. Use a diagnostic scanner to confirm the code and test the module and glow plugs for proper operation.

6. How is the P163C code fixed on a Cadillac?

Repair may involve replacing the glow plug control module, repairing damaged wiring or connectors, or replacing defective glow plugs.

7. How much does it cost to repair a P163C code on a Cadillac?

The cost varies, but replacing a glow plug control module can range from $200 to $500, while glow plug replacement may cost $100 to $300 per plug, plus labor.

8. Can I reset the P163C code on my Cadillac without fixing the issue?

While you can clear the code with a diagnostic scanner, it will likely return if the underlying problem isn't addressed.

9. Is the P163C code specific to diesel Cadillacs?

Yes, this code is specific to diesel engines, as they use glow plugs to assist in starting the engine during cold conditions.

10. Do I need special tools to fix a P163C code on a Cadillac?

Basic tools like a multimeter and a diagnostic scanner are often sufficient for troubleshooting. Advanced repairs may require specialized tools for module replacement or glow plug removal.