Bulletin No.:

Service Bulletin

Date:

19-NA-211
September, 2019

TECHNICAL
Subject:

Brand:

Loss of Propulsion or No Start with Malfunction Indicator Lamp (MIL) Illuminated and
DTC P0A45 or P1B04 Set

Model:

Model Year:

VIN:

from

to

Malibu E2

2016

2018

Volt D2

2016

2018

from

Chevrolet

to

—

Engine:

Transmission:

1.8L —
RPO LKN

5ET50 —
RPO MKE

1.5L —
RPO L3A

5ET50 —
RPO MKV

Involved Region or Country

North America, South Korea

Condition

Some customers may comment on a loss of propulsion and/or a no start with the MIL
illuminated.

Cause

The Drive Motor 2nd Position Rotor Bearing Cage may have failed or the internal
transmission wiring harness for the Drive Motor 2 Position Sensor may have backed out
terminal(s), poor terminal connections, corrosion, poor crimps, damaged terminals and/or
high resistance in one or more circuits. The technician may find one or more of the
following DTCs set in the T6 Power Inverter Module, also referred to as the Drive Motor
Generator Power Inverter Module and Hybrid/EV Powertrain Control Module 1:
• DTC P0A45 Drive Motor 2 Position Sensor Circuit
• DTC P1B04 Drive Motor 2 Position Sensor Circuit Tracking Lost
Note: At least one of these two DTCs must have set for this bulletin to apply.

Correction

Review the Safety Information and perform the Service Procedure.

•

Safety Information
Important: Always perform the High Voltage
Disabling procedure prior to servicing any High
Voltage component or connection. Personal
Protection Equipment (PPE) and proper procedures
must be followed.
Danger: Ensure all High Voltage safety procedures
are followed. Failure to follow the procedure exactly
as written may result in serious injury or death.
Danger: Before working on any high voltage
system, be sure to wear the following Personal
Protection Equipment:
• Safety glasses with appropriate side shields when
within 50 feet (15.24 m) of the vehicle, either
indoors or outdoors.
• Certified and up-to-date Class “0” Insulation
gloves rated at 1000V with leather protectors.

Copyright 2019 General Motors LLC. All Rights Reserved.

Visually and functionally inspect the gloves
before use.
• Wear the Insulation gloves at all times when
working with the high voltage battery assembly,
whether the system is energized or not.
The High Voltage Disabling procedure only
de-energizes the high voltage circuits and
components outside of the Hybrid/EV battery pack.
Dangerous voltage levels always exist within the
Hybrid/EV battery pack.
The technician must verify that the high voltage
disabling procedure was successful by measuring
the applicable connectors for a safe voltage level
with a DMM.

Service Procedure
1. Perform the Diagnostic System Check - Vehicle.
Refer to Diagnostic System Check - Vehicle
in SI.
2. Is DTC P0A45 or P1B04 set?
⇒ If DTC P0A45 or P1B04 are set, go to Step 3.
Continue even if the DTCs are Set as “Current”
or Set as “History.”

Page 2

3.
4.

5.

6.

7.

September, 2019

⇒ If the vehicle is setting additional faults for both
Drive Motor 1 Position Sensor Circuits and
Drive Motor 2 Position Sensor Circuits
simultaneously, or several additional DTCs are
set, contact GM Technical Assistance Center
(TAC) for diagnostic help before proceeding.
Disable the High Voltage. Refer to High Voltage
Disabling in SI.
There are two known product issues causing
DTC P0A45 and/or DTC P1B04 to Set.
Drive Motor 2nd Position Rotor Bearing Cage
failure.
Drive Motor 2 Position Sensor Wiring Harness
electrical faults.
4.1. First: The Technician will need to inspect for
Drive Motor 2nd Position Rotor Bearing Cage
failure.
4.2. Second: If the rotor bearing cage is found
intact, then the Technician will need to replace
the Drive Motor 2 Position Sensor Circuit
wiring harness for electrical faults such as
backed out terminals, corrosion, poor crimps,
damaged terminals and/or high resistance.
4.3. Go to Step 5.
Remove the transmission. Refer to Transmission
> Automatic Transmission - 5ET50 MKV >
Repair Instructions - On Vehicle >
Transmission Replacement in SI.
Remove the Drive Motor 2nd Position. Refer to
Transmission > Automatic Transmission 5ET50 MKV > Repair Instructions Off - Vehicle >
Drive Motor Removal - 2nd Position in SI.
Disassemble the Drive Motor 2nd Position. Refer
to Transmission > Automatic Transmission 5ET50 MKV > Repair Instructions Off - Vehicle >
Drive Motor Removal - 2nd Position > Drive
Motor Disassemble – 2nd Position in SI.

Bulletin No.: 19-NA-211

5401682

5401685

8. Inspect for Drive Motor 2nd Position rotor bearing
cage failure/damage.
⇒ If the Drive Motor 2nd Position Rotor Bearing
has failed, locate and remove all of the pieces
of the failed bearing throughout the entire
transmission case. Any leftover debris can
cause another loss of propulsion event by
causing a short circuit in either of the motors.
Refer to Transmission Case Cleaning and
Inspection in SI.
Go to Step 9.
⇒ If the Drive Motor 2nd Position Rotor Bearing
has not failed, Go to Drive Motor Position
Sensor Circuits in this Bulletin.
5401678

Bulletin No.: 19-NA-211

September, 2019

Page 3

4051633

Important: When installing the new Drive Motor 2
Position Sensor, the black clip must be oriented 90
degrees to the sensor body as shown in the image
above. Failure to do so could cause a DTC P0A46
Drive Motor 2 Position Sensor Performance to Set,
with a loss of propulsion.
9. Replace the following components for the Drive
Motor 2nd Position: Rotor, Stator, and Motor
Position Sensor Stator. Refer to Drive Motor
Assemble - 2nd Position in SI.
10. Install the Drive Motor 2nd Position. Refer to Drive
Motor Installation - 2nd Position in SI.
11. Install the transmission. Refer to Transmission
Replacement in SI.
12. Enable the high voltage system. Refer to High
Voltage Enabling in SI.
13. Perform the Diagnostic Repair Verification. Refer
to Diagnostic Repair Verification in SI.

Drive Motor Position Sensor Circuits
Overview

5051615

The Drive Motor Power Inverter Module is an assembly
which contains two motor control modules and the
Hybrid/EV Powertrain Control Module 1. The drive
motor position sensor is monitored by its respective
motor control module.

Page 4

September, 2019

The motor control module monitors the angular
position, speed and direction of the drive motor rotor
based upon the signals of the resolver-type position
sensor. The drive motor position sensor circuits operate
at very low current. These circuits are susceptible to
moisture intrusion, backed out terminal(s) (shown),
poor terminal connections or damage, poor crimps and
corrosion. The harness cannot be repaired for any of
these conditions, it must be replaced.
1. Verify the date code on the replacement harness is
after 04/07/2018 prior to installation.
2. Replace the transmission wiring harness with Part
Number 24285318 HARNESS, A/TRNS WRG SHF
POSN SWITCH. Refer to Automatic
Transmission Wiring Harness Replacement
in SI.
3. Perform the Diagnostic Repair Verification. Refer
to Diagnostic Repair Verification in SI.

Mandatory Replacement Parts —
Reference Table
Description

Part Number

Quantity

Seal, PIM Hose

23323369

1

Transmission
Mount Bolt

11547918

3

Exhaust Gasket

23238284

1

Stabilizer Shaft
Link Nut

11609282

2

Front Lower Control
Arm Ball Joint Nut

11609282

2

Transmission Mount
Strut Bolt

11589275

1

Bolt, Drivetrain &
Front Suspension
C/MBR FRT

11547242

2

Bolt, Drivetrain &
Front Suspension
C/MBR RR

11547242

4

Washer, Front Wheel
Drive Shaft (57 OD,
53THK)

11611964

2

Drive Motor 2 Position Sensor Circuit 2

Seal, Trans Fluid
Cooler Pipe (Slimline
Washer 3/8")

25874797

1

Drive Motor 2 Position Sensor Circuit 2

Seal, Trans Fluid
Cooler Pipe

23278166

1

Automatic
Transmission Case
Extension Bolt

11547223

2

Drive Motor Rotor
Bearing
Retaining Ring

24254001

1

Drive Motor Support 2nd Position

24277039

1

Drive Motor Position
Sensor Bolt

24259568

4

Additional Keywords
DTC P0C57:
Low Voltage
DTC P0C58:
High Voltage
DTC P0C61:
Low Voltage
DTC P0C62:
High Voltage

Bulletin No.: 19-NA-211

Drive Motor 2 Position Sensor Circuit 1
Drive Motor 2 Position Sensor Circuit 1

Parts Information
Major Components
Description

Part Number

Quantity

HARNESS, A/TRNS
WRG SHF POSN
SWITCH

24285318

1

ROTOR, DRV MOT
(2ND POSN)

24274987

1

Drive Motor
Stator Bolt

24256582

4

STATOR, DRV MOT
(2ND POSN)

24286565

1

STATOR, DRV MOT
POSN SEN

24259003

1

Automatic
Transmission Torque
Dampener and
Differential Housing
Gasket

24254013

1

Bulletin No.: 19-NA-211

September, 2019

Page 5

Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation

Description

Labor Time

8463570

Automatic
Transmission Wiring
Harness Replacement

Use Published
Labor
Operation Time

8466840

Drive Motor Rotor
Replacement - 2nd
Position

Use Published
Labor
Operation Time

Version Information
Version

1

Modified

Released September 12, 2019

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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