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Service bulletin PIT5125C

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10126977
Published by NHTSA2018-01-16
Manufacturer's numberPIT5125C
Manufacturer's date2017-12-18
NHTSA componentEXTERIOR LIGHTING:TURN SIGNAL

NHTSA's summary

This Preliminary Information communication provides information to the technician about vehicles proper operation of the stop and/or turn signals. For vehicles without Regular Production Option Code V4D circuit 618 is for the left stop and turn signal and circuit 619 dark green is for the right stop and turn signal. For vehicles with Regular Production Option Code V4D circuit 618 yellow is for the left turn signal only. Circuit 619 dark green is for the right turn signal only and circuit 1320 light blue is for the stop lamps only.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Lighting, Turn signals

Vehicles listed
CHEVROLET EXPRESS2009, 2010, 2011, 2012
CHEVROLET EXPRESS2014, 2015, 2016, 2017, 2018
CHEVROLET EXPRESS CUTAWAY2013 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PIT5125A2023-12-11. Service bulletin. Available Stop And Turn Lamp Options/Diagnostic Information
PIT5125D2019-03-18. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles proper operation of the stop and/or turn signals. For vehicles without Regular Production Option Code V4D circuit 618 is for the left stop and turn signal and circuit 619 dark green is for the right stop and turn signal. For vehicles with Regular Production Option Code V4D circuit 618 yellow is for the left turn signal only. Circuit 619 dark green is for the right turn signal only and circuit 1320 light blue is for the stop lamps only.
16-NA-3452018-05-21. Service bulletin. This Technical bulletin provides information for reprogramming the BCM due to software anomaly causing the turn signals to engage when depressing the brake pedal.
PIT5125B2017-05-22. Service bulletin. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES PROPER OPERATION OF THE STOP AND/OR TURN SIGNALS. FOR VEHICLES WITHOUT REGULAR PRODUCTION OPTION CODE V4D CIRCUIT 618 IS FOR THE LEFT STOP AND TURN SIGNAL AND CIRCUIT 619 DARK GREEN IS FOR THE RIGHT STOP AND TURN SIGNAL. FOR VEHICLES WITH REGULAR PRODUCTION OPTION CODE V4D CIRCUIT 618 YELLOW IS FOR THE LEFT TURN SIGNAL ONLY. CIRCUIT 619 DARK GREEN IS FOR THE RIGHT TURN SIGNAL ONLY AND CIRCUIT 1320 LIGHT BLUE IS FOR THE STOP LAMPS ONLY.
PIT-47482009-11-10. Service bulletin. CHEVROLET/GMC: SOME VEHICLE UPFITTERS, PRIOR TO COMPLETION OF THEIR WORK ON THE INCOMPLETE VEHICLE (CUTAWAY VANS), MAY COMMENT THAT THE RIGHT REAR TURN SIGNAL AND STOP LAMPS ARE BOTH INOPERATIVE. THIS CAN BE CAUSED IF CIRCUIT 6519 IS IN THE WRONG CAVITY ON CONNECTOR X2 AT THE UNDERHOOD FUSE BLOCK. *PE