B1578 on 2021-2023 Ford Mustang Mach-E: Camera & Driver Assist Faults Explained (B1578:78 & B1578:89)

What's Unique About the 2021-2023 Ford MUSTANG MACH E

On the technology-forward Mustang Mach-E, the B1578 code is a prime example of a modern, software-based vehicle issue. Unlike older cars where a similar code might point to a simple wiring or component failure, on the Mach-E it's overwhelmingly linked to software bugs in the advanced driver-assistance system (ADAS). Ford has released multiple, evolving TSBs specifically to address this code with software updates, highlighting that the core logic of the system, rather than a physical part, is the most common point of failure. This issue is also shared across other modern Ford platforms like the F-150 and Expedition.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• "Reverse Brake Assistance Not Available" message on the instrument cluster.
• "Camera Is Unavailable. Please Contact Your Dealership." message.
• "Front Camera Fault Service Required" message.
• Other driver-assistance warnings like "Pre-Collision Assist Not Available" or "Lane-Keeping System Fault".
• Rearview camera or 360-degree camera system is inoperative or malfunctioning.
• Adaptive cruise control may be inoperative.
• Auto high beams inoperative.

Most Likely Causes

1. IPMA Software Requires Update 🔴 High Probability Ford has explicitly identified this as the primary cause in multiple evolving Technical Service Bulletins (TSB 22-2295, superseded by TSB 23-2040; TSB 23-2021) for early production Mach-E models built on or before specific dates (e.g., 04-May-2022).
   How to confirm: A Ford dealer or a qualified technician will use the Ford Diagnostic and Repair System (FDRS) to check the current software version of the IPMA against the latest available version cited in the TSBs. The presence of DTC B1578:78 or B1578:89 alongside matching symptoms is a strong confirmation.
   Typical fix: Reprogramming the IPMA to the latest software level using FDRS. This is a coordinated update that often includes reprogramming the PSCM, CCM, and CMR as well, followed by mandatory camera alignment procedures.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Image Processing Module A (IPMA): If a software update does not resolve the code, and all wiring is confirmed to be intact, the module itself may have an internal hardware failure. This is much less common than the software issue. Replacement out of warranty can be extremely expensive, with forum members reporting quotes approaching $5,000 for parts and labor.
• Wiring Harness or Connector Issue: While not widely reported for this specific code, damage to the wiring or a loose connection at the IPMA could theoretically cause this fault. One owner reported a repair that included replacing a coax cable to the camera along with the IPMA. This would be investigated after a software update fails to fix the problem.
• Incorrect Camera Alignment Data: In some cases, even after an update, a persistent B1578:78 code can be caused by incomplete or failed camera alignment. 🎬 Watch: Using FORScan to align the front lane keep camera. One owner on macheforum.com reported finally clearing the code by manually running all four IPMA camera alignment procedures in FDRS, including the trailer alignment, which is often overlooked.

Diagnosis Steps

1. Confirm the presence of DTC B1578, paying close attention to the suffix (e.g., :78 or :89) as it points to different TSBs and symptoms.
2. Check for active warning messages on the instrument cluster and consult Ford TSBs (e.g., 23-2040, 23-2021) to confirm the vehicle's build date and symptoms match.
3. Connect the vehicle to the Ford Diagnosis and Repair System (FDRS) and ensure a stable 12V power supply is connected. Do not connect the high-voltage charger.
4. Follow the TSB procedure, starting with the 'Reset the Image Processing Module A (IPMA) Learned Values' application in FDRS.
5. Next, reprogram the IPMA using the latest FDRS software level. This will trigger a coordinated update for related modules (PSCM, CCM, CMR).
6. After the update, perform the mandatory camera alignment procedures. This is a multi-step process that requires driving the vehicle.
7. Perform the 'FDRS Rear Parking Aid Camera alignment' and/or '360 Degree View Camera Alignment'. The 360-view alignment requires driving slowly 🎬 See a walkthrough of the Ford 360-degree camera alignment process. and straight through a lined parking lot.
8. Perform the 'FDRS Image Processing Module A (IPMA) alignment'. This procedure requires driving on a straight, well-marked road or highway.
🎬 Watch: How to perform a Ford ADAS windshield camera calibration.
9. Run the 'IPC-Instrument Panel Cluster (IPC) Configuration' application in FDRS.
10. Clear all DTCs and perform an IPMA on-demand self-test to confirm the fault is gone.
11. If the code returns, inspect the wiring and connectors to the IPMA. If all software and wiring diagnostics pass, the IPMA itself may be faulty and require replacement.

Parts You'll Likely Need

• Image Processing Module A (IPMA) (OEM #14G647 (Base Part Number)) — This module is the root cause of the issue, though it typically only needs a software update. In the rare case of hardware failure, the entire module must be replaced. The causal part number listed in TSBs is 14G647. Full part numbers vary by vehicle configuration; examples for the related F-150 include ML3Z-14G647-U and ML3Z-14G647-FCA.
  Trusted brands: Motorcraft
  OEM price range: $600-$800
  Aftermarket price range: $0

Related Codes That Often Appear With This One

• U3000:49 — This code, along with others, is listed in TSB 22-2295 and its successors as being related to the same IPMA software issue.
• U3000:89 — Also listed in TSB 22-2295 as a potential companion code due to the IPMA software fault.
• U2107:68 — Another code mentioned in TSB 22-2295, indicating a broader communication issue stemming from the IPMA glitch.
• C1001:54 — Mentioned in TSB 22-2295 as part of the group of codes that can be triggered by the IPMA software issue.

Technical Service Bulletins (TSBs) & Recalls

• TSB 23-2040: Supersedes TSB 22-2295. Addresses various ADAS warnings and DTCs B1578:78, U3000:49, etc., on 2021-2022 Mach-E, F-150, and 2022 Expedition/Navigator due to IPMA software.
• TSB 23-2021: Addresses B1578:78 and "Reverse Brake Assistance Not Available" message on 2021-2022 Mach-E (rear view camera only) due to IPMA software.
• SSM 53020: Pertains to B1578:89 with a "Camera is Unavailable" message on 2021-2024 Mach-E and other 2024 Ford/Lincoln models.
• SSM 50162: Pertains to B1578:78 appearing after an on-demand self-test on 2021 Mach-E with the 360-degree camera system, fixed by camera alignment.
• TSB 25-2398: A newer TSB mentioned in forums, also addressing B1578:78 and the "Reverse Brake Assistance Not Available" message.

Platform-Specific Known Issues

• Multiple TSBs have been issued by Ford. TSB 23-2040 (superseding 22-2295) addresses a wide range of DTCs including B1578:78 for vehicles built before May 2022.
• TSB 23-2021 is more specific, targeting 2021-2022 Mach-E models with only the standard rearview camera system (not 360-degree) built before Oct 28, 2022.
• The issue is prevalent enough that Ford has detailed service procedures that involve reprogramming not just the IPMA, but also potentially the PSCM, CCM, and CMR modules in a coordinated update.
• SSM 50162 specifically addresses B1578:78 appearing after an on-demand self-test on 2021 Mach-E models with the 360-degree camera system, pointing to a camera alignment fix.

Mechanic-Grade Diagnostic Values

• 12V Battery State of Charge (SOC) before programming — expected: 50% or higher. Failure: Less than 50% SOC may cause programming to fail.

Hidden / Shadow Codes Worth Checking

• B1578:78:2F: A more specific version of the B1578:78 code seen on dealer-level scan tools. The meaning of the final :2F suffix is not clearly documented in public sources but is associated with the Reverse Brake Assist unavailable warning. (see via Ford Diagnosis and Repair System (FDRS) or equivalent professional scan tool.)

Scan Tool Commands That Help

• Ford Diagnosis and Repair System (FDRS): IPMA - Reset the Image Processing Module A (IPMA) Learned Values — This is the first step in the TSB procedure to clear old calibration or fault data before reprogramming the module or performing new alignments.
• Ford Diagnosis and Repair System (FDRS): IPMA - 360 Degree View Camera Alignment — This is a mandatory step after reprogramming the IPMA on vehicles equipped with the 360-degree camera system.
• Ford Diagnosis and Repair System (FDRS): IPMA - Pro Trailer Backup Assist Camera Alignment — Per TSB 22-2295, this must be performed on all vehicles *without* 360-degree cameras. It has also been reported by owners as the final fix for persistent B1578:78 codes on vehicles *with* 360-degree cameras when other alignments fail to clear the code.
• Ford Diagnosis and Repair System (FDRS): IPC-Instrument Panel Cluster (IPC) Configuration — This is one of the final steps in the official TSB repair procedure after the IPMA has been reprogrammed and realigned.
• Ford Diagnosis and Repair System (FDRS): IPMA - Image Processing Module A (IPMA) Recovery — Used as a special recovery tool when the IPMA module is not communicating on the network, causing various driver assistance warnings and lost communication DTCs in other modules.

Wiring & Ground Locations

• Connector C9128 — The coaxial cable connector at the IPMA camera, located behind the plastic cover of the rearview mirror assembly on the windshield.. This is a primary connection point between the camera and the module. TSBs for related codes instruct technicians to perform a 'wiggle test' here to check for a poor connection, which can cause IPMA faults.
• IPMA Coaxial Harness — The harness runs from the camera at the rearview mirror, across the headliner, down the driver's side A-pillar, and to the IPMA module.. Damage to this cable, especially kinking it more than 90 degrees during a windshield replacement or other service, can cause communication faults that trigger B1578 and other IPMA codes.
• Connector C900 — The coaxial cable connector at the Image Processing Module A (IPMA) itself.. This is the other end of the camera's data connection. A loose connection here will cause a loss of video signal and trigger fault codes.

Real Owner Repair Stories

• macheforum.com user 'Piolin' (Ford Mustang Mach-E with 360-degree cameras) — Persistent DTC B1578:78 that could not be cleared after activating Active Park Assist.
  ❌ Tried (didn't work) Clearing DTCs via scan tool., Following standard TSB procedures., Running only the 360-degree camera alignment.
  ✅ What actually fixed it The code was finally cleared by running ALL four IPMA camera alignment procedures in FDRS, specifically including the 'trailer alignment' which the user had previously skipped.
• f150forum.com user 'DukeofYork' (2021 Ford F-150 (shares platform technology)) — DTC B1578:78:2F and 'Reverse Brake Assist Unavailable' message.
  ❌ Tried (didn't work) Performing the 360 Camera Alignment procedure; the alignment was successful but the code remained.
  ✅ What actually fixed it The dealer then performed the 'Pro Trailer Backup Camera Alignment'. It failed twice, but on the third attempt, it completed successfully and cleared the code.

When the Usual Fixes Don't Work

• In cases where the standard TSB procedure of reprogramming the IPMA and performing the primary camera alignment does not clear code B1578:78, the root cause may not be a faulty module or failed software update. As documented by owners, the fix can be performing an additional, seemingly unrelated alignment procedure in FDRS, such as the 'Pro Trailer Backup Assist Camera Alignment', even on vehicles that do not have that feature. This suggests the IPMA requires a full set of calibration data to be present, and a partial alignment can leave it in a faulted state.

OEM Part Supersession History

• Varies → LJ8Z-14D202-V, LJ8Z-14D202-W, or LJ8Z-14D202-U — These are replacement coaxial cable part numbers used to fix connection issues between the camera and the IPMA, as detailed in TSB 23-2137.
  Heads up: The correct cable part number depends on the vehicle's specific feature set (minor feature codes HKLAG, HKLAH, J3QAD, etc.).

Model Year Variations Within This Range

• 2021-2022: TSB 23-2021 is specific to vehicles built on or before Oct 28, 2022, that are equipped with the standard rearview camera only (not the 360-degree system).
• 2021-2022: TSB 22-2295 (and its successors) applies to vehicles built on or before May 4, 2022, and covers a wider range of ADAS faults in addition to B1578:78.
• 2022-2023: Some vehicles manufactured in this period as a cost-cutting measure during chip shortages are missing the NV7424-0 LIN chip on the IPMA circuit board. This prevents Active Park Assist from functioning. IPMA part numbers beginning with 'L' are likely affected, while some beginning with 'P' are not.