# Service bulletin PIT5599

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10125125
- Published by NHTSA: 2017\-12\-14
- Manufacturer's number: PIT5599
- Manufacturer's date: 2017\-11\-20
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM

## NHTSA's summary

This Preliminary information communicates a false setting of DTCU0121 in the FVCM due to a FVCM software anomaly. Code U0121 will set and be moved to history in the FVCM with each ignition cycle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125125-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125125-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Software

## Trouble codes named

U0121

## Vehicles listed

- 2017 to 2018 BUICK LACROSSE
- 2016 CADILLAC CT6
- 2017 to 2018 CADILLAC CT6 PLUG\-IN HYBRID
- 2016 to 2018 CADILLAC ESCALADE
- 2017 to 2018 CADILLAC XT5
- 2017 to 2018 CHEVROLET BOLT EV
- 2016 to 2018 CHEVROLET MALIBU
- 2016 to 2017 CHEVROLET SILVERADO 1500
- 2018 CHEVROLET SILVERADO 2500
- 2016 to 2018 CHEVROLET SUBURBAN
- 2016 to 2018 CHEVROLET TAHOE
- 2017 to 2018 GMC ACADIA
- 2016 to 2017 GMC SIERRA 1500
- 2018 GMC SIERRA 3500
- 2016 to 2018 GMC YUKON

## Recalls for the same vehicles and component

- [19V642000](/recalls/nhtsa/19V642000.md), 2019-09-06: ENGINE; ELECTRICAL SYSTEM:SOFTWARE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
- [16V084000](/recalls/nhtsa/16V084000.md), 2016-02-11: ELECTRICAL SYSTEM:SOFTWARE

## Other bulletins for the same vehicles and component

- [20\-NA\-132](/bulletins/10252774.md), 2024-04-05, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
- [PIP5632G](/bulletins/10230683.md), 2023-01-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
- [PIP4902Q](/bulletins/10230682.md), 2023-01-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
- [PIP5814](/bulletins/10230680.md), 2023-01-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary information communicates that there some service parts released to dealers missing software.
- [N21234575001](/bulletins/10214723.md), 2022-06-27, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. High Voltage Battery Software Update
- [N212345750](/bulletins/10214720.md), 2022-06-27, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. High Voltage Battery Software Update
- [17419](/bulletins/10191076.md), 2021-04-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Condition Certain 2018 model year Chevrolet Silverado HD and GMC Sierra HD vehicles, equipped with 6.6L diesel engine \(RPO L5P\) and Allison transmission \(RPO MW7\), may have a condition in which the automatic transmission has rough upshifts. Correction Reprogram the transmission control module \(TCM\).
- [15\-NA\-083](/bulletins/10190387.md), 2021-04-20, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Recovery Process from a Controller Reprogramming Interruption During service reprogramming of the T87 TCM, some technicians may notice the TCM may fail during the reprogramming event and become unresponsive to the Service Programming System \(SPS\), unresponsive to the GDS2 tool. This bulletin addresses corrective actions to attempt to recover the module before declaring the TCM as a bad part and replacing. During reprogramming, an interruption can cause the module to lock up. A module reset may recover the TCM
- [21NA010](/bulletins/10187773.md), 2021-03-01, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); ELECTRICAL SYSTEM:SOFTWARE. This technical bulletin provides a procedure to reset the DTCs and take the vehicle for a test drive to verify the codes do not return.
- [20NA224](/bulletins/10186092.md), 2021-02-01, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. This service bulletin provides a procedure to inspect the A/C compressor failure due to a combination of low refrigerant and/or PAG oil to correct a condition of Air Conditioning Blows Warm Air and/or Does Not Get Cold.

JSON: [/v1/bulletins/10125125](/v1/bulletins/10125125)

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