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Service bulletin S2008000186

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 id10184426
Published by NHTSA2020-12-21
Manufacturer's numberS2008000186
Manufacturer's date2020-11-20
NHTSA componentENGINE; ELECTRICAL SYSTEM

NHTSA's summary

Engine Control Module (ECM) Flash Failure, Diagnostic Trouble Code (DTC) U1601 ? ECU Application Software Code 1 Missing Or Corrupted

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

Trouble codes named

U1601

Vehicles listed
RAM 15002021
RAM 25002019, 2020, 2021
RAM 35002019, 2020, 2021
RAM 45002019, 2020, 2021
RAM 55002021

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

Recalls for the same vehicles and component
25V2980002025-05-08. AIR BAGS; ELECTRICAL SYSTEM:WIRING
20232212023-04-13. Engine
20230262023-02-09. Electrical
23V0600002023-02-09. ELECTRICAL SYSTEM:WIRING:RELAYS/SOLENOIDS
20225842022-10-14. Engine
22V7670002022-10-13. ENGINE; FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
20216292021-10-14. Electrical
21V7980002021-10-14. ELECTRICAL SYSTEM:WIRING:RELAYS/SOLENOIDS
20213602021-06-10. Engine
21V4390002021-06-10. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
91008982026-09-17. Service bulletin. Engine PNs: MY 24-26 WD/DT (5.7L) Code P00B is being misdiagnosed and incorrect parts are being installed causing over repair. Refer to SOL S2609000006 The IAFM Foam Engine Valley Cover (PN 53013735AB) does not provide sufficient clearance for proper routing of the MDS solenoid jumper harness (PN 05148163AE). As a result, the harness may become compressed by the foam cover. To prevent unnecessary part replacement, the MDS solenoid jumper harness (PN 05148163AE) should be inspected for damage or pinch conditions prior to replacing the following part numbers: Engine PNs: 68409343AA 68409357AA 68450915AA OCV PNs: 53022338AB Phaser PNs: 53022298AA 53022298AB
91009012026-09-17. Service bulletin. Passive Entry O/S Dr Handle Prior to replacing an inoperative passive entry door handle, perform Star Online S2623000040.
1142542026-09-03. Service bulletin. RADIATOR - ENGINE COOLING
1142552026-09-03. Service bulletin. RADIATOR - ENGINE COOLING
1140722026-08-26. Service bulletin. MOTOR - WINDOW REGULATOR
1140732026-08-26. Service bulletin. MOTOR - WINDOW REGULATOR
1137442026-08-06. Service bulletin. SENSOR - TURBOCHARGER SPEED
1137422026-08-06. Service bulletin. SENSOR - TURBOCHARGER SPEED
S26080000332026-07-23. Service bulletin. Cluster Message “To Operate Tailgate Shift to Park” Vehicle is In Park
1130692026-07-08. Service bulletin. SWITCH – HEADLAMP