A20-029 Service Bulletin/Repair Instructions

Service Bulletin

April 1, 2020
20-029

Version 1
9-Speed A/T Hard Upshift with Steady Acceleration

AFFECTED VEHICLES

Year
Model
Trim
VIN Range
2019
Passport
ALL
ALL
2019
Pilot
Touring and Elite
ALL
SYMPTOM

The transmission has intermittent harsh or jerky upshifts with steady acceleration.

POSSIBLE CAUSES

There are abnormal TCM adaptation values in the TCM software.

NOTE

Make sure the vehicle has at least 500 miles on the odometer because it takes that long for the TCM to adapt to the

customer's driving pattern.

CORRECTIVE ACTION

Update the TCM.

NOTES

•
This software update repairs intermittent harsh or jerky shifts with steady acceleration. For any other symptoms,

continue with normal system troubleshooting.
•
Have the service manager or service advisor explain to the customer that after the TCM update, it will take about

500 miles for the TCM to adapt to the customer's driving pattern.
CUSTOMER INFORMATION:The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and

training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume

this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an

authorized Honda automobile dealer.

©
2020 American Honda Motor Co., Inc. — All Rights Reserved
Page 1 of 3
WARRANTY CLAIM INFORMATION

The normal warranty applies.

Operation

Number
Description
Flat Rate

Time
Defect

Code
Symptom

Code
Template

ID
Failed Part Number
1255D0
Update the TCM

software.
0.2 hr
03214
03217
A20029A
28103-5NZ-A00
Skill Level: Repair Technician

SOFTWARE INFORMATION

NOTE

Unnecessary or incorrect repairs resulting from a failure to update the diagnostic and reprogramming software are not

covered under warranty.

Before beginning the repair, make sure all diagnostic and reprogramming software are updated as listed.

i-HDS Software Version
1.005.048 or later
HDS Software Version
3.103.048 or later
J2534 Rewrite Software Information

PC Application Version
1.2.1.1 or later
Database Update
18-MAR-2020 or later
NoticeDB Version
18-MAR-2020 or later
Update only the systems and software listed in this service bulletin.

Do not use the MongoosePRO VCI for this service bulletin as it is not an American Honda-approved device.

For more information about updating vehicle systems, refer to service bulletin 01-023, Updating Control Units/Modules.

Year/Model
Vehicle System
Program ID (or later)
2019 Passport 2WD
TCM
28101-5EY-A600
2019 Passport AWD
TCM
28101-5EZ-A600
2019 Pilot Touring 2WD
TCM
28101-5EY-A500
2019 Pilot Touring and Elite AWD
TCM
28101-5EZ-A500
Page 2 of 3
REPAIR PROCEDURE

NOTES

•
Make sure the 12-volt battery is fully charged before starting an update.
•
Connect a fully charged jumper battery to the vehicle, and leave it connected during the entire procedure to maintain

steady voltage.
•
Do not use the GR8 because the vehicle requires a steady electrical current.
•
Control module failure caused by the improper completion of a software update (early key cycle, low battery voltage,

disconnected DLC cable, etc.) is not covered by warranty.
•
If an error occurs during the update or the i-HDS freezes, do not disconnect the battery or turn the ignition to

OFF. Reboot the i-HDS, and start over.
•
To prevent control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power

windows, door locks, etc.) during the update.
•
Warranty reimbursement for technician labor is not allowed for routine checking/installation of any available

software update.
1. Verify the customer concerns for the intermittent harsh or jerky upshift with steady acceleration.

NOTE

This service bulletin does not apply to vehicles with a hard downshift or hard upshift using the paddle shifters or

vehicles with under 500 miles on the odometer, Follow normal system troubleshooting.

2. Update the TCM software using the J2534 Rewrite software with the DST-i. Refer to service bulletin 01-023,

Updating Control Units/Modules.

NOTE

Have the service manager or service advisor explain to the customer that after the TCM update, it will take about

500 miles for the TCM to adapt to the customer's driving pattern.

END
Page 3 of 3

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