AutoCodes – Cadillac – P163D Cadillac

P163D Cadillac Code - Glow Plug Control Module Secondary 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: P163D Cadillac indicates Glow Plug Control Module Secondary 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 286

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 P163D 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. If the GPCM receives a command to turn on the glow plugs, and Ignition 1 Signal voltage is low this code will set. If the GPCM detects voltage on the glow plug circuits while glow plugs are not commanded on this code will set. If the GPCM detects a ground offset of 1.5 volts between the GPCM ground and the glow plug ground circuit this code will be set. The GPCM will send a message to the Engine Control Module (ECM) to set this Diagnostic Trouble Code (DTC).

OBDII Code P163D Cadillac - Glow Plug Control Module Secondary Circuit - AutoCodes.com — P163D Cadillac Code - Glow Plug Control Module Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P163D 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 P163D 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 P163D 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 P163D Cadillac Code

What does the OBDII code P163D mean on a Cadillac?

1. P163D indicates a fault in the Glow Plug Control Module Secondary Circuit, which affects the operation of the glow plugs used to assist with cold engine starts in diesel engines. 2.

What are the common symptoms of code P163D on a Cadillac?

Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and an illuminated check engine light. 3.

What causes the P163D code on a Cadillac?

The code can be triggered by issues such as a faulty glow plug control module, damaged wiring or connections in the secondary circuit, or failed glow plugs. 4.

Can driving with the P163D code cause further damage?

While the vehicle may still run, ignoring the code can lead to harder engine starts in cold weather and potential damage to the glow plug system over time. 5.

How is the P163D code diagnosed?

A mechanic will inspect the glow plug control module, check the wiring and connectors for damage or corrosion, and test the functionality of individual glow plugs using a multimeter. 6.

How do you fix the P163D code on a Cadillac?

Repairs may include replacing the glow plug control module, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing faulty glow plugs. 7.

How much does it cost to fix the P163D code on a Cadillac?

Repair costs can range from $200 to $600 or more, depending on whether the glow plug control module, wiring, or glow plugs need to be replaced. 8.

Can a weak battery cause the P163D code to appear?

Yes, a weak or failing battery can result in insufficient voltage reaching the glow plug control module, potentially triggering the code. 9.

Is the P163D code specific to Cadillac vehicles?

No, the P163D code is not exclusive to Cadillacs, but its interpretation and specific repair steps may vary between vehicle makes and models. 10.

Can I clear the P163D code without fixing the issue?

While you can clear the code with an OBDII scanner, it will likely return if the underlying problem with the glow plug control module or circuit is not resolved.