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Ford C1121

64. This may be due to the vehicle dynamics module (VDM) software. To correct the condition, follow the service procedure to reprogram the

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Ford dealer or qualified service facility. The verified Ford guidance directs technicians to follow the service procedure to reprogram the VDM for the documented condition.
Confidence95%

Quick answer

For a 2021 Ford Mustang Mach-E in the US, verified Ford TSB evidence links DTC C1121:64 with vehicle dynamics module (VDM) software. The documented correction is to follow the applicable service procedure to reprogram the VDM.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does C1121 mean?

For a 2021 Ford Mustang Mach-E in the US, verified Ford TSB evidence links DTC C1121:64 with vehicle dynamics module (VDM) software. The documented correction is to follow the applicable service procedure to reprogram the VDM.

2. Technical explanation

The supplied evidence specifically identifies C1121:64, not every possible C1121 variant. Ford communications TSB 22-2138 and TSB 22-2180 state that the condition may be due to VDM software and direct technicians to reprogram the VDM using the service procedure.

3. What system is affected?

Vehicle dynamics module (VDM) software. The supplied evidence does not further establish the affected vehicle subsystem.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • An IPC message referring to 80 mph (120 km/h), as described in the supplied TSB evidence.
  • “Driver Selectable Suspension Fault Service Required” message in the IPC.

6. Possible causes

  • VDM software may be responsible for C1121:64, according to Ford TSB 22-2138 and TSB 22-2180.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis with a Ford dealer or qualified service facility and provide the exact stored code suffix, C1121:64, if present.
  • Record any IPC messages and the conditions under which they appeared.
  • Do not attempt VDM programming without the applicable Ford service procedure and equipment.

10. Step-by-step troubleshooting

  1. Confirm whether the stored diagnostic trouble code is specifically C1121:64.
  2. Check whether the IPC displays the 80 mph (120 km/h) message or “Driver Selectable Suspension Fault Service Required” message described by the TSBs.
  3. Have service personnel review the applicable Ford TSB and perform the specified VDM reprogramming procedure if applicable.

11. When to contact service

Contact a Ford dealer or qualified service facility. The verified Ford guidance directs technicians to follow the service procedure to reprogram the VDM for the documented condition.

12. What the service center may check

  • Verify vehicle applicability: 2021 Ford Mustang Mach-E, US.
  • Verify DTC C1121:64.
  • Verify the applicable IPC message or symptom described in Ford TSB 22-2138 or TSB 22-2180.
  • Review and follow the applicable Ford service procedure for VDM reprogramming.

13. Possible repair or resolution

  • Reprogram the vehicle dynamics module (VDM) by following the applicable Ford service procedure, when the TSB condition and applicability are confirmed.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Ford TSB 22-2138, published April 21, 2022; NHTSA Manufacturer Communication 10210470. It documents an 80 mph (120 km/h) IPC message or “Driver Selectable Suspension Fault Service Required” with C1121:64 and states the condition may be due to VDM software.
  • Ford TSB 22-2180, published May 11, 2022; NHTSA Manufacturer Communication 10211907. It documents a 120 km/h (80 mph) IPC message or “Driver Selectable Suspension Fault Service Required” with C1121:64 and states the condition may be due to VDM software.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted manufacturer communications: TSB 22-2138 (NHTSA ID 10210470) and TSB 22-2180 (NHTSA ID 10211907).

19. Frequently asked questions

What does C1121:64 mean for a 2021 Ford Mustang Mach-E?

The verified Ford TSB evidence states that C1121:64 may be due to vehicle dynamics module software and directs reprogramming of the VDM through the applicable service procedure.

What warning messages are documented with C1121:64?

The supplied TSB evidence documents an IPC message referring to 80 mph (120 km/h) and/or “Driver Selectable Suspension Fault Service Required.”

Is it safe to drive or charge with C1121:64?

Not yet established by verified evidence.

Is there a verified recall for this issue?

Not yet established by verified evidence.

20. Sources & verification

Verified
Ford C1121: 64. This may be due to the vehicle dynamics module (VDM)… | EV Diagnostics