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Service bulletin 21NA011

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 id10187774
Published by NHTSA2021-03-01
Manufacturer's number21NA011
Manufacturer's date2021-01-20
NHTSA componentELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

NHTSA's summary

This service bulletin provides a procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated.

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

Electrical system, Engine, Engine control module

Vehicles listed
CADILLAC CT62019, 2020

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
PIP5628F2023-05-15. Service bulletin. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
22NA0362022-07-18. Service bulletin. Vehicle Odometer Not Matching Display after ECM, BCM or IPC Controller Replacement.
21NA1392021-08-09. Service bulletin. This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.
N1922870202020-11-30. Service bulletin. Service Update - Certain 2019-2020 model year Cadillac CT6 vehicles equipped with a 10 speed transmission, (RPO MHS or MHW) may have a condition when shifting into park, resulting in a momentary loss of park engagement. If this were to occur, one or more of the following DTC codes P0606, P06AF or P07E4 may set and illuminate the check engine light. Dealers will reprogram the ECM.