C003A on the 2024 Ram 3500
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 08-339-26 | 2026-09-30. Service bulletin. Max Tow Right and Left Rear Wheel Speed Sensors Inoperable Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● C003A-62 - Right Rear Wheel Speed Sensor - Signal Compare Failure. ● C0037-62 - Left Rear Wheel Speed Sensor - Signal Compare Failure. ● C003A-2F - Right Rear Wheel Speed Sensor - Signal Erratic. ● C0037-2F - Left Rear Wheel Speed Sensor - Signal Erratic. Customers may comment on one or more of the following: ● The check engine light is illuminated. ● The Anti-Lock Brake System (ABS) light is illuminated. ● The Traction Control System (TCS) light is illuminated. ● The Forward Collision Warning (FCW) light is illuminated. ● The "4WD Unavailable" message is displayed in the Instrument Panel Cluster (IPC). ● Vehicle might not shift from Drive to Park or vice versa. NOTE: The vehicle safe hold systems are in place if the vehicle does not shift to Park. ● Vehicle will not shut off. This bulletin involves replacing both rear wheel speed sensors. |
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| 08-374-25 | 2025-11-19. Service bulletin. Max Tow Right and Left Rear Wheel Speed Sensors Inoperable Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● C003A-62 - Right Rear Wheel Speed Sensor - Signal Compare Failure. ● C0037-62 - Left Rear Wheel Speed Sensor - Signal Compare Failure. ● C003A-2F - Right Rear Wheel Speed Sensor - Signal Erratic. ● C0037-2F - Left Rear Wheel Speed Sensor - Signal Erratic. Customers may experience one or more of the following: ● The check engine light illuminates. ● The ABS light illuminates. ● The traction control light illuminates. ● The forward collision warning lamps light illuminates. ● The 4WD unavailable message on the Instrument Panel Cluster (IPC). ● Vehicle might not shift from drive to park or vice versa. The vehicle safe hold systems are in place if the vehicle does not shift to park. ● Vehicle will not shut off. This bulletin involves replacing both rear wheel speed sensors. |
| 05-004-24 | 2024-12-10. Service bulletin. "Brake Warning Lamp Illumination Over Rumble Strips Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● C003A-2F - Right Rear Wheel Speed Sensor - Signal Erratic. ● C0037-2F - Left Rear Wheel Speed Sensor - Signal Erratic. Customers may also comment on the following: ● Automatic Brake System (ABS) lamp and Electronic Stability Control (ESC) lamp turn on when driving over rumble strips. This bulletin involves replacing one or both rear wheel speed sensors. " |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.