Bulletin No.: PIC6391
Published date: 01/28/2020

Preliminary Information
PIC6391 2020 Cadillac CT5 Electronic Brake Control Boost Module
and Brake Pressure Modulator Part Restriction
Models
Brand:
Cadillac

Model:
CT5

Model Years:
2020

VIN:
from
All

Engine:

to
All

All

Transmissions:
All

Involved Region or Country North America
As part of our ongoing continuous improvement we have placed the Electronic
Brake Boost Control Module and the Brake Pressure Modulator Valve used in the
2020 Cadillac CT5 on restriction. If you believe a new module is needed, please ll
out the questions below and contact the Technical Assistance Center (TAC) /
product Quality Center (PQC) as needed. Please have the part number available
prior to contacting TAC/PQC. Please have the part number available prior to
contacting TAC/PQC.
Condition

Please contact the (PQC) by opening a new case via Dealer Case Management
(DCM). From the DCM home page, click on “New PQC Case” found on the Technical
Assistance tab.
Then, in Global Connect click on the Support/Chat tab, TAC-PQC Tab, PQC - Parts
Restrictions Templates to Download the appropriate PQC - Parts Restrictions
Template and save a copy to your computer. You can attach a copy of the
template to your PQC Case.
Note: (Do Not clear any DTCs prior to contacting the PQC)

Cause

Root Cause Analysis

Caller’s First & Last Name/Position:
Technician’s Name/Direct Phone:
Parts Manager’s Name:

Parts Manager’s Phone & Fax Number:
Dealership’s Correct Address:
Customer Owned (Y/N):
or Dealer Stock(Y/N):
Times In/Days Down:
A completion of the Template questions is required for the following
Q1: Is the part being requested for:
•

Customer Pay (if under warranty, note reason for CP)? (Y/N)

•

A Model Year Not Listed

•

A Vehicle Line Not Listed

If Yes, Stop DO not answer remaining questions.
If no, continue to next question

Q2: What is Customer’s Concern?
Customer's concern duplicated? (Y/N)
Q3: List any history and current (active) DTCs by control module
• What Module?
• What is the DTC?
Q4: Are any of the DTCs repeatable? (Y/N)
• If yes, List the repeatable DTCs.
Q5: Are there any speci cs vehicles conditions that the issue occurs? (Weather conditions, high acceleration, at
start-up, etc.) (Y/N)
• If no, continue to the next question.
• If yes, under what conditions?
Q6: What SI document numbers were used for diagnosis?
List the step of the Circuit/System Testing that led to replacement.
Q7: Were there any previous repairs related to this concern?
(Y/N)
Q8: Is the vehicle modi ed with any non-production accessories?(Y/N)
Q9: Does the vehicle have a recent history of low battery voltage or been jump-started? (Y/N)
Q10: Has the battery been charged recently? (Y/N)
Q11: Were the wires / harnesses checked for proper routing, and are free from damage, stretch, pinch, etc.? (Y/N)
Q12: Have all of the ECU grounds been checked? (Y/N)
List any loose grounds/connections encountered, and Reference the speci c power and ground schematic.
Q13: Have the connector terminals been checked for “backed
out” or “damage” at the ECU and sensor based on the DTC. (Y/N)
Q14: Has the ECU been reprogrammed? (Y/N)
If yes, was programming interrupted at any point? (Y/N)
(If programming was interrupted, advise the dealer to call the Techline Customer Support Center, 1-800-8286860)
Were there any codes after reprogramming?
• List the codes set before reprogramming?
• List the codes set after programming?
What software & calibration p/ns were reprogrammed?

Parts Information
Part Number
84779555

Description
Electronic Brake Booster Control
Module

Quantity
1

Part Number

Description
Quantity
Valve Kit, Brake Pressure Modulator

84826636

1

Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor
Operation

Description

Labor Time

2441440

Electronic Brake Boost Control Module Replacement

Use published
Labor Time

2441440

Brake Master Cylinder Replacement - With Power Brake Booster and Electronic
Brake Control Module

Use published
Labor Time

Version History
Version

1

Modi ed

01/28/2020 – Created on.

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