Service bulletin 08-041-19 REV. A

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)
Type	Service bulletin
NHTSA id	10166575
Published by NHTSA	2019-10-28
Manufacturer's number	08-041-19 REV. A
Manufacturer's date	2019-08-01
NHTSA component	SUSPENSION

NHTSA's summary

Flash: Air Suspension Control Module (ASCM) Updates This bulletin involves reprogramming the ASCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:C220C-48 - Active Suspension Module Internal-Supervision Software Failure. C211B-92 - Ignition Run/Start Input-Performance Or Incorrect Operation. C156C-7A - Ride Height System Air Leak-Fluid Leak Or Seal Failure. In addition the customer may describe:Excessive operation or noise from air suspension system when vehicle is stationary. "Air Suspension Disabled" message when attempting Bed Lowering Mode (BLM). Excessive compressor valve cycling following a cold start(Diesel engine only). Erroneous "Bed Low Achieved" message through the Instrument Panel Cluster (IPC), when requesting lowering, even though the truck didn't physically lower. Ride height changes/valve actuations without operator request on rough roads.

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

Suspension

Trouble codes named

C156C, C211B, C220C

Vehicles listed
RAM 2500	2019
RAM 3500	2019

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
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