RAM
08-315-25
Manufacturer communications
- Publication date
- 2025-09-23
- Received by NHTSA
- 2025-10-02
- NHTSA record numbers
- 11023587
Manufacturer summary
Original wording in English
Flash: Amplifier (AMP) Diagnostic and System Updates **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):**
• B143B-12 - ANC Microphone 1-Circuit Short To Battery.
• B143C-12 - ANC Microphone 2-Circuit Short To Battery.
• B143E-12 - ANC Microphone 3-Circuit Short To Battery.
• B143F-12 - ANC Microphone 4-Circuit Short To Battery. NOTE: The DTCs are wrongly set and do not affect Active Noise Cancellation (ANC) performance This bulletin involves updating the AMP with the latest available software.
• B143B-12 - ANC Microphone 1-Circuit Short To Battery.
• B143C-12 - ANC Microphone 2-Circuit Short To Battery.
• B143E-12 - ANC Microphone 3-Circuit Short To Battery.
• B143F-12 - ANC Microphone 4-Circuit Short To Battery. NOTE: The DTCs are wrongly set and do not affect Active Noise Cancellation (ANC) performance This bulletin involves updating the AMP with the latest available software.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Ram
B143B-12ANC Microphone 1-Circuit Short To BatteryRam
B143C-12ANC Microphone 2-Circuit Short To BatteryRam
B143E-12ANC Microphone 3-Circuit Short To BatteryRam
B143F-12ANC Microphone 4-Circuit Short To BatteryCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ram | 1500 | 2021 |