NHTSA ID Number: 10161888
Manufacturer Communication Number: 19NA049
Summary
This technical bulletin provides repair information to correct a customer concern of reduced propulsion power without DTCs on higher mileage vehicles (with P1.4 Cell Chemistry).
2 Affected Products
Vehicle
CHEVROLET | VOLT | 2011-2012 |
SEOCONTENT-START
Bulletin No.: 19-NA-049
Date: May, 2019
Service Bulletin
TECHNICAL
Subject: Reduced Propulsion Power without DTCs on Higher Mileage Vehicles (with P1.4 Cell Chemistry)
This Bulletin replaces PIC6309A. Please discard PIC6309A.
| Brand: | Model: | Model Year: | VIN: | Engine: | Transmission: | |||
| from | to | from | to | |||||
| from | to | from | to | |||||
| Chevrolet |
Volt | 2011 | 2012 | 1.4L (LUU) | 4ET50 Automatic (MKA) | |||
| Opel / Vauxhall | Ampera | 2012 | 2012 | |||||
| Involved Region or Country | North America, Europe, N.A. Export Regions |
| Additional Options (RPOs) | Without RPO YK8 |
| Condition | Some customers may state that they occasionally see a Propulsion Power is Reduced message in the Driver Information Center (DIC) that was not present under the same driving conditions previously. They may also state the engine speed was very high at the time of the message or that the engine compartment had a hot smell. |
| Cause | When the battery pack is over-discharged, the system will enter a reduced power mode until the battery state of charge self-recovers by using aggressive engine charging. This may be caused by a controls issue with normal wear of the high voltage battery. It does not necessarily indicate that the there is a problem with the battery itself. |
| Correction | • If there are ANY diagnostic codes set that would affect propulsion, consider diagnosing them first prior to applying this bulletin.
• If there are NO diagnostic codes present that would affect propulsion, then this document may apply to the customer’s situation. There are some cases where a Propulsion Power is Reduced message is considered normal. For example, any Volt or Ampera, climbing a steep grade at interstate speeds without proper use of Mountain Mode will encounter this same message without DTCs. If this is the case, refer the customer to proper use of Mountain Mode in the owner’s manual. Also, extreme outside temperatures, especially in winter, may cause the message to appear until the battery temperature has stabilized. If a Propulsion Power is Reduced message occurs during regular operation, and there are no DTCs present, then determine the chemistry of the battery currently in the vehicle using the chemistry determination procedure, SI Document ID 4877428. • If the vehicle has P1.4 cell chemistry on board, then reprogram the Hybrid Powertrain Control Module 2 (HPCM2) for a new calibration to help alleviate the condition. Refer to Hybrid Powertrain Control Module 2 Programming and Setup in SI. Important: After flashing the update into the HPCM2, the technician should perform a capacity reset in the HPCM2 using GDS2; then fully charge the vehicle prior to delivery to the customer. • If the vehicle has newer cell chemistry than P1.4, such as 2012 vehicles built with RPO code YK8 or if the vehicle has been serviced with a newer battery chemistry in the past, then the bulletin DOES NOT apply and reprogramming will not correct the condition. After reprogramming, some customers may notice a slight reduction in EV range due to the battery no longer being over-discharged. The EV range achieved previously was due to the over-discharged condition. The new calibration properly aligns the expected EV range with the age of the vehicle. |
Parts Information
No parts are required for this repair.
Warranty Information
For vehicles repaired under the Voltec coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
| Labor Operation | Description | Labor Time | |
| 5080258* | HPCM2 reprogramming for Reduced Propulsion Power | 0.4 hr | |
| *This is a unique Labor Operation for Bulletin use only. | |||
| Version | 2 |
| Modified | Released March 11, 2019 May 01, 2019 – Corrected the Warranty coverage statement. |
SEOCONTENT-END
Bulletin No.: 19-NA-049
Date: May, 2019
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Reprogramming
GM Diagnostic/Programming (TIS2Web)
Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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