Subject:

Engineering Information – 8 Speed Transmission Shift Quality

Attention:

Proceed with this EI ONLY if the customer has commented about this concern AND the PIE number is listed in the
Global Warranty Management / Investigate History link (GWM/IVH). If the customer has not commented about this
condition or the EI does not show in GWM/IVH, disregard the PI and proceed with diagnostics found in published
service information. THIS IS NOT A RECALL — refer to the latest version of Service Bulletin 04-00-89-053 for more
details on the use of Engineering Information bulletins.

This EI has been revised to update the Contact Information. Please discard PIE0538.
Brand:

Model:

Cadillac

CT4

Chevrolet

Camaro

Model Year:

VIN:

from

to

from

to

2020

2020

-

-

Transmission:

-

Equipped with
Automatic
Transmission (RPO
M5N)
Equipped with
Automatic
Transmission (RPO
M5T)

Colorado

GMC

Engine:

Express

Equipped with
Automatic
Transmission
(RPOs M5U, MQD)

Silverado

Equipped with
Automatic
Transmission (RPO
MQE)

Canyon

Equipped with
Automatic
Transmission (RPO
M5T)

Savana

Equipped with
Automatic
Transmission
(RPOs M5U, MQD)

Sierra

Equipped with
Automatic
Transmission (RPO
MQE)

Involved Region or Country

North America

1

Important: If the customer did not bring their vehicle in for this concern, DO NOT proceed with this EI.

Condition

Some customer may comment of one or more of the following transmission symptoms:
–

Harsh Garage Shift (Park to Reverse, Reverse to Drive, Drive to Reverse)

–

Delayed or Slow to Engage into Drive or Reverse

–

Harsh/Hard/Firm Upshift and/or Downshift

–

Slip/Flare Upshift or Downshift

GM Engineering is attempting to determine the root cause of the above condition. Engineering has a need to
gather information on vehicles PRIOR to repair that may exhibit this condition. As a result, this information will be
used to "root cause" the customer's concern and develop/validate a field fix.

Cause

Correction
If you encounter a vehicle with the above concern, perform the following steps and establish a DCM PQC case BEFORE contacting the engineers listed below
with your findings.
1.

Was the vehicle driven or towed into the dealership?

2.

What is the current mileage?

3.

What valve body part number is being requested? (Refer to the EPC for obtaining the correct valve body P/N#)

4.

Why is the valve body being requested?

5.

Does the vehicle have any non-production modifications? (Include all modifications not just powertrain related items)

6.

Is the vehicle for personal or commercial use?
6.1.

7.

If commercial what is the vehicle use?

Are there any DTCs current or history?
Important: Note all DTC’s in all modules DO NOT clear any DTC’s prior to contacting engineering.

8.

9.

What is the customers concern? (Describe in detail 1-2 shift, 2-3 shift, 3-2 downshift, 2-1 downshift, garage shift harsh, garage shift delayed, etc.)
8.1.

Can the customer concern be duplicated?

8.2.

Is the condition repeatable or intermittent?

8.3.

How long has the condition been present with the vehicle? (since new, or is this a new concern).

8.4.

Does the condition occur (hot, cold, accelerate, decelerate, power down, lift foot etc.)?

8.5.

At what speed does the condition occur?

If shift quality related use GDS to determine which shift is suspect?
9.1.

Which shift(s) are suspect?

9.2.

What is the throttle angle?

9.3.

What is the vehicle speed?

10. Is the transmission fluid at the proper level?
10.1. Does the fluid appear to be discolored?
10.2. If the pan has been removed is there debris/sediment in the pan?
11. Does the ECM and TCM have the latest software calibrations? (DO NOT update any calibrations prior to reviewing with engineering)
12. Has the transmission electrical connector (X175) been inspected for being properly connected/seated and routed properly?
13. Are there any transmission fluid leaks? If yes note the location.
14. Are there any noises related to the condition?
14.1. What type of noise.
14.2. What is the source of the noise?
15. What diagnosis has been completed to this point?
15.1. What Service Information (SI) document(s) have been used?
15.2. Have there been any previous repairs to the vehicle?

Contact Information
Engineer Name

Phone Number

The Engineer Name and Phone Number have been redacted.

2

Please include the following information if leaving a message:
–

Technician name (First & Last)

–

Dealer name and phone number

–

Complete VIN and repair order (R.O) number

–

Requested Restricted Part number

On the repair order, document the date and time the call was placed (even if the engineer was not reached).
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information found in SI.

Warranty Information
If engineer was contacted or required information was provided, use:
Labor Operation

Description

Labor Time

8480888*

Engineering Information – 8 Speed Transmission Shift Quality

0.5 hr

*This is a unique Labor Operation for bulletin use only.

Version

2

Modified

Released September 20, 2019
Revised January 17, 2020 – Updated the Contact Information.

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