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Tesla DI_a138

Front motor disabled - OK to drive Vehicle power may be limited

Common search variants: DIa138 · DI-a138 · DI a138 · Search ignores case and common separators.

DriveTesla documentation states, “Continue to your destination. Your vehicle is OK to drive.” It also states that in some cases the vehicle may be unable to continue driving; if that occurs, another vehicle alert is expected. Drive capability can therefore be reduced, with reduced power, speed, and acceleration.
ChargeNot yet established by verified evidence.
ServiceNot yet established by verified evidence. The supplied documentation does not provide a specific service-contact instruction for DI_a138.
Confidence95%

Quick answer

DI_a138 means the front motor is unavailable. Tesla documentation states that power, speed, and acceleration may be reduced while the vehicle uses the rear motor(s) to continue driving.

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

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

How to diagnose and fix Tesla Front Motor disabled #DI_a138_frontUnitDisabledDigital EV Doctor (Tesla alert clear)
Tesla DIF_a024_selfTest PMF_a033_selfTest #DI_a138Digital EV Doctor (Tesla alert clear)
Tesla DIF_a024_selfTest PMF_a033_Selft Test DI_a138Digital EV Doctor (Tesla alert clear)

Videos are supporting material and never override OEM or regulator evidence.

1. What does DI_a138 mean?

DI_a138 means the front motor is unavailable. Tesla documentation states that power, speed, and acceleration may be reduced while the vehicle uses the rear motor(s) to continue driving.

2. Technical explanation

This Tesla alert identifies an unavailable front motor. The documented operating effect is reduced power, speed, and acceleration as propulsion continues using the rear motor(s). Tesla documentation also states that the alert can be caused by a temporary condition; no specific underlying fault cause is established by the supplied verified evidence.

3. What system is affected?

Front motor / vehicle propulsion system.

4. How serious is this code?

The database severity value is unknown. The alert indicates reduced propulsion capability and warns that, in some cases, the vehicle may be unable to continue driving.

5. Symptoms you may notice

  • The vehicle displays: “Front motor disabled - OK to drive Vehicle power may be limited.”
  • Front motor unavailable.
  • Power may be reduced.
  • Speed may be reduced.
  • Acceleration may be reduced.
  • The vehicle may use the rear motor(s) to continue driving.
  • In some cases, the vehicle may be unable to continue driving.

6. Possible causes

  • Tesla documentation states this alert may be caused by a temporary condition.
  • No specific component-level or system-level cause is established by the supplied verified evidence.

7. Can I still drive the vehicle?

Tesla documentation states, “Continue to your destination. Your vehicle is OK to drive.” It also states that in some cases the vehicle may be unable to continue driving; if that occurs, another vehicle alert is expected. Drive capability can therefore be reduced, with reduced power, speed, and acceleration.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Follow the on-screen alert and continue to your destination only if the vehicle remains drivable.
  • Expect reduced power, speed, and acceleration.
  • If the vehicle becomes unable to continue driving, do not attempt high-voltage repairs; follow the vehicle’s additional alert instructions.
  • Do not perform work on the front motor or high-voltage propulsion system yourself.

10. Step-by-step troubleshooting

  1. No owner-performed diagnostic procedure is established by the supplied verified evidence.
  2. Tesla documentation states the condition may be temporary.
  3. Monitor the vehicle for additional alerts, particularly if it becomes unable to continue driving.

11. When to contact service

Not yet established by verified evidence. The supplied documentation does not provide a specific service-contact instruction for DI_a138.

12. What the service center may check

  • Not yet established by verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Official NHTSA-hosted Tesla manufacturer communications/owner documentation include DI_a138, including NHTSA Manufacturer Communication PDF 10250484 (published 2023-12-01): https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf
  • The supplied documents present alert meaning and owner guidance; a specific repair bulletin or repair procedure for DI_a138 is not established by the supplied verified evidence.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified NHTSA-hosted Tesla documentation describes DI_a138 as a front-motor-unavailable alert. Example: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf

19. Frequently asked questions

What does Tesla alert DI_a138 mean?

It means the vehicle’s front motor is unavailable. Power, speed, and acceleration may be reduced while the rear motor(s) continue to propel the vehicle.

Can I drive with DI_a138?

Tesla documentation says to continue to your destination and states that the vehicle is OK to drive. It also notes that the vehicle may, in some cases, be unable to continue driving.

Will performance be reduced?

Yes. Verified documentation states that power, speed, and acceleration may be reduced.

What causes DI_a138?

Tesla documentation says it may be caused by a temporary condition. A more specific cause is not established by the supplied verified evidence.

Can I charge with DI_a138?

Not yet established by verified evidence.

20. Sources & verification

Accepted ResearchVerified
Show all 58 verified sources
Tesla DI_a138: Front motor disabled - OK to drive Vehicle power may be… | EV Diagnostics