Service bulletin 08-014-21

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	10187133
Published by NHTSA	2021-02-16
Manufacturer's number	08-014-21
Manufacturer's date	2021-01-27
NHTSA component	AIR BAGS; EXTERIOR LIGHTING; BACK OVER PREVENTION; ENGINE AND ENGINE COOLING

NHTSA's summary

Motor Generator Unit (MGU) Connector Not Fully Seated This bulletin involves replacing the MGU. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following Diagnostic Trouble Codes (DTCs). U0594 - Implausible Data Received From HCP. P1B03-00 - Resolver Signal / MCPA Rationality. P0A3F-00 - Drive Motor A Position Sensor 1 Circuit. P0607-00 - ECU Internal Performance. P1C64-00 - Hybrid Perf - Engine Speed Below Target During Autostart. P0A92-00 - Hybrid Generator Performance. Customers may also experience the following: The vehicle has 15-40 minutes of driving time before a vehicle stall.The vehicle will be unable to re-start. The vehicle will lose charging of the main 12V battery. A check engine light and/or a low battery light illuminates.

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

Air bags, Driver assistance, Engine, Lighting, Backup camera

Trouble codes named

P0607, P0A3F, P0A92, P1B03, P1C64, U0594

Vehicles listed
RAM 1500	2020, 2021

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

Recalls for the same vehicles and component
23V059000	2023-02-09. BACK OVER PREVENTION:DISPLAY FUNCTION
22V638000	2022-08-25. BACK OVER PREVENTION:DISPLAY FUNCTION
21V918000	2021-11-23. STEERING:STEERING CONTROL MODULE; BACK OVER PREVENTION:DISPLAY FUNCTION
21V438000	2021-06-10. BACK OVER PREVENTION:DISPLAY FUNCTION
20V191000	2020-09-10. BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

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
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103289	2025-03-04. Service bulletin. CAMERA - REAR VIEW
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1801623	2024-01-02. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following DTCs:P0335 - Crankshaft Position Sensor Circuit. P0339 - Crankshaft Position Sensor Intermittent. Other software enhancement included with this update: Idle stability improvements during Electronic Stability Control (ESC) events.
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