Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Ford Fiesta S, Standard TransFACTORY OEM SERVICE PROCEDURE
Audio Front Control Module (ACM)
AUDIO FRONT CONTROL MODULE (ACM) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B1A01:01 | Speaker #1: General Electrical Failure | GO to Pinpoint Test F . |
| B1A01:11 | Speaker #1: Circuit Short to Ground | GO to Pinpoint Test F . |
| B1A01:12 | Speaker #1: Circuit Short to Battery | GO to Pinpoint Test F . |
| B1A01:13 | Speaker #1: Circuit Open | GO to Pinpoint Test F . |
| B1A02:01 | Speaker #2: General Electrical Failure | GO to Pinpoint Test F . |
| B1A02:11 | Speaker #2: Circuit Short to Ground | GO to Pinpoint Test F . |
| B1A02:12 | Speaker #2: Circuit Short to Battery | GO to Pinpoint Test F . |
| B1A02:13 | Speaker #2: Circuit Open | GO to Pinpoint Test F . |
| B1A03:01 | Speaker #3: General Electrical Failure | GO to Pinpoint Test F . |
| B1A03:11 | Speaker #3: Circuit Short to Ground | GO to Pinpoint Test F . |
| B1A03:12 | Speaker #3: Circuit Short to Battery | GO to Pinpoint Test F . |
| B1A03:13 | Speaker #3: Circuit Open | GO to Pinpoint Test F . |
| B1A04:01 | Speaker #4: General Electrical Failure | GO to Pinpoint Test F . |
| B1A04:11 | Speaker #4: Circuit Short to Ground | GO to Pinpoint Test F . |
| B1A04:12 | Speaker #4: Circuit Short to Battery | GO to Pinpoint Test F . |
| B1A04:13 | Speaker #4: Circuit Open | GO to Pinpoint Test F . |
| B1A56:1D | Antenna: Circuit Current Out of Range | GO to Pinpoint Test A . |
| B1A56:21 | Antenna: Signal Amplitude Minimum |
NOTE:
If DTC B1A56:21 sets after running the bezel diagnostic tests disregard this DTC. This test is used for end of line or repair bay testing at the Ford plant. Each plant has its own assigned frequency and signal strength requirements. The running and passing of this test depends on local radio stations. If no local station is broadcasting on the required frequency the test will fail. Therefore test ran from the bezel diagnostic screen and the DTC generated from the test can be disregarded. DISREGARD this DTC. |
| B1A89:11 | Satellite Antenna: Circuit Short to Ground | GO to Pinpoint Test B . |
| B1A89:13 | Satellite Antenna: Circuit Open | GO to Pinpoint Test B . |
| B1D19:4B | Compact Disc Unit: Over Temperature | The ACM was over-temperature. This may occur during extended use. Audio operation can resume after the ACM cools. CLEAR the DTCs. This is normal operation. |
| U0074:00 | Control Module Communication Bus "B" Off: No Sub Type Information | REFER to MODULE COMMUNICATIONS NETWORK . |
| U0140:00 | Lost Communication With Body Control Module: No Sub Type Information | GO to Pinpoint Test P . |
| U0253:00 | Lost Communication With Accessory Protocol Interface Module: No Sub Type Information | GO to Pinpoint Test Q . |
| U0257:00 | Lost Communication With Front Controls/Display Interface Module: No Sub Type Information | GO to Pinpoint Test R . |
| U2100:00 | Initial Configuration Not Complete: No Sub Type Information | REPROGRAM the Audio Front Control Module (ACM). REFER to the Programmable Module Installation (PMI) procedure in MODULE CONFIGURATION . TEST the system for normal operation. |
| U2101:00 | Control Module Configuration Incompatible: No Sub Type Information | REPROGRAM the ACM. REFER to the PMI procedure in MODULE CONFIGURATION . TEST the system for normal operation. |
| U3000:41 | Control Module: General Checksum Failure | CLEAR the DTCs. REPEAT the self-test. If DTC U3000:41 is retrieved again, INSTALL a new ACM. REFER to Audio Control Module (ACM) . TEST the system for normal operation. |
| U3000:42 | Control Module: General Memory Failure | CLEAR the DTCs. REPEAT the self-test. If DTC U3000:41 is retrieved again, INSTALL a new ACM. REFER to Audio Control Module (ACM) . TEST the system for normal operation. |
| U3000:49 | Control Module: Internal Electronic Failure | CLEAR the DTCs. REPEAT the self-test. If DTC U3000:49 is retrieved again, INSTALL a new ACM. REFER to Audio Control Module (ACM) . TEST the system for normal operation. |
| U3000:96 | Control Module: Component Internal Failure | GO to Pinpoint Test C . |
| U3003:16 | Battery Voltage: Circuit Voltage Below Threshold | GO to Pinpoint Test S . |
| U3003:17 | Battery Voltage: Circuit Voltage Above Threshold | GO to Pinpoint Test T . |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.