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.
2018 Ford Fiesta STFACTORY OEM SERVICE PROCEDURE
Information System And Entertainment System DTCS: Am/Fm/Cd/Sync: ACM
DTC INDEX
| DTC | Description | Action |
|---|---|---|
| B1A01:01 | Speaker #1: General Electrical Failure | For a left front door speaker concern, GO to Pinpoint Test F For a left front door tweeter speaker concern, GO to Pinpoint Test G |
| B1A01:11 | Speaker #1: Circuit Short To Ground | For a left front door speaker concern, GO to Pinpoint Test F For a left front door tweeter speaker concern, GO to Pinpoint Test G |
| B1A01:12 | Speaker #1: Circuit Short To Battery | For a left front door speaker concern, GO to Pinpoint Test F For a left front door tweeter speaker concern, GO to Pinpoint Test G |
| B1A01:13 | Speaker #1: Circuit Open | GO to Pinpoint Test F |
| B1A02:01 | Speaker #2: General Electrical Failure | For a right front door speaker concern, GO to Pinpoint Test H For a right front door tweeter speaker concern, GO to Pinpoint Test I |
| B1A02:11 | Speaker #2: Circuit Short To Ground | For a right front door speaker concern, GO to Pinpoint Test H For a right front door tweeter speaker concern, GO to Pinpoint Test I |
| B1A02:12 | Speaker #2: Circuit Short To Battery | For a right front door speaker concern, GO to Pinpoint Test H For a right front door tweeter speaker concern, GO to Pinpoint Test I |
| B1A02:13 | Speaker #2: Circuit Open | GO to Pinpoint Test H |
| B1A03:01 | Speaker #3: General Electrical Failure | GO to Pinpoint Test J |
| B1A03:11 | Speaker #3: Circuit Short To Ground | GO to Pinpoint Test J |
| B1A03:12 | Speaker #3: Circuit Short To Battery | GO to Pinpoint Test J |
| B1A03:13 | Speaker #3: Circuit Open | GO to Pinpoint Test J |
| B1A04:01 | Speaker #4: General Electrical Failure | GO to Pinpoint Test K |
| B1A04:11 | Speaker #4: Circuit Short To Ground | GO to Pinpoint Test K |
| B1A04:12 | Speaker #4: Circuit Short To Battery | GO to Pinpoint Test K |
| B1A04:13 | Speaker #4: Circuit Open | GO to Pinpoint Test K |
| B1A56:21 | Antenna: Signal Amplitude < Minimum | 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 fails. |
| B1D19:49 | Compact Disc Unit: Internal Electronic Failure | CLEAR the DTC. WAIT at least 10 seconds. REPEAT the self-test. If the DTC is retrieved again, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) . |
| 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 DTC. This is normal operation. |
| U0155:00 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information | GO to Pinpoint Test Z |
| U0253:00 | Lost Communication With Accessory Protocol Interface Module: No Sub Type Information | GO to Pinpoint Test AB |
| U0257:00 | Lost Communication With Front Control/Display Interface Module: No Sub Type Information | GO to Pinpoint Test AC |
| U201A:51 | Control Module Main Calibration Data: Not Programmed | This DTC sets due to incomplete or incorrect PMI procedures. CHECK the vehicle service history for recent service actions related to the ACM. If there have been recent service actions with the ACM, CARRY OUT the PMI procedure as directed by the diagnostic scan tool. If there have been no recent service actions, INSTALL a new ACM to correct the failure to retain configuration data. REFER to: Audio Front Control Module (ACM) . |
| U2100:00 | Initial Configuration Not Complete: No Sub Type Information | This DTC sets due to incomplete or incorrect PMI procedures. CHECK the vehicle service history for recent service actions related to the ACM. If there have been recent service actions with the ACM, CARRY OUT the PMI procedure as directed by the diagnostic scan tool. If there have been no recent service actions, INSTALL a new ACM to correct the failure to retain configuration data. REFER to: Audio Front Control Module (ACM) . |
| U2101:00 | Control Module Configuration Incompatible: No Sub Type Information | This DTC sets due to incomplete or incorrect PMI procedures. CHECK the vehicle service history for recent service actions related to the ACM. If there have been recent service actions with the ACM, CARRY OUT the PMI procedure as directed by the diagnostic scan tool. If there have been no recent service actions, INSTALL a new ACM to correct the failure to retain configuration data. REFER to: Audio Front Control Module (ACM) . |
| U3000:41 | Control Module: General Checksum Failure | CLEAR the DTC. WAIT at least 10 seconds. REPEAT the self-test. If the DTC is retrieved again, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) . |
| U3000:42 | Control Module: General Memory Failure | CLEAR the DTC. WAIT at least 10 seconds. REPEAT the self-test. If the DTC is retrieved again, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) . |
| U3000:96 | Control Module: Component Internal Failure | CLEAR the DTC. WAIT at least 10 seconds. REPEAT the self-test. If the DTC is retrieved again, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) . |
| U3003:16 | Battery Voltage: Circuit Voltage Below Threshold | GO to Pinpoint Test AD |
| U3003:17 | Battery Voltage: Circuit Voltage Above Threshold | GO to Pinpoint Test AE |
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.
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