EV Diagnostics
Verified EV diagnostic knowledge page

BMW 224163

Electric auxiliary heater for the high-voltage battery unit: Undervoltage or internal communication fault

DriveNot yet established by verified evidence. BMW bulletin B170124 lists a possible “Drive, you can continue driving” Check Control message (ID49), but the supplied evidence does not provide a general determination that every vehicle storing 224163 is safe to drive.
ChargeNot yet established by verified evidence.
ServiceContact a BMW service center or qualified EV service facility for diagnosis, particularly if coolant is leaking, heater output is low, or ID49 is displayed.
Confidence97%

Quick answer

BMW OEM fault code 224163 identifies an undervoltage or internal communication fault involving the electric auxiliary heater for the high-voltage battery unit. BMW bulletin B170124 associates this code with coolant leaking beneath the vehicle, low heater output, and a possible “Drive, you can continue driving” Check Control message (ID49).

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.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

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

1. What does 224163 mean?

BMW OEM fault code 224163 identifies an undervoltage or internal communication fault involving the electric auxiliary heater for the high-voltage battery unit. BMW bulletin B170124 associates this code with coolant leaking beneath the vehicle, low heater output, and a possible “Drive, you can continue driving” Check Control message (ID49).

2. Technical explanation

The verified BMW/NHTSA bulletin evidence defines code 224163 as: “Electric auxiliary heater for the high-voltage battery unit: Undervoltage or internal communication fault.” The supplied evidence does not establish a single confirmed failed part or root cause for every occurrence of this code.

3. What system is affected?

Electric auxiliary heater for the high-voltage battery unit.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Coolant leaking from under the vehicle.
  • Low heater output.
  • Possible Check Control message: “Drive, you can continue driving” (ID49).

6. Possible causes

  • Undervoltage involving the electric auxiliary heater for the high-voltage battery unit.
  • An internal communication fault involving the electric auxiliary heater for the high-voltage battery unit.
  • The precise root cause for an individual vehicle is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. BMW bulletin B170124 lists a possible “Drive, you can continue driving” Check Control message (ID49), but the supplied evidence does not provide a general determination that every vehicle storing 224163 is safe to drive.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • If coolant is visibly leaking from under the vehicle or heater output is low, arrange assessment by a BMW service center or qualified EV service facility.
  • Record any Check Control message and the stored fault code for the service visit.
  • Do not attempt high-voltage heater diagnosis or repair yourself.

10. Step-by-step troubleshooting

  1. Have a qualified technician retrieve and evaluate stored fault memory, including code 224163.
  2. BMW bulletin B170124 should be reviewed by the servicing facility because it lists code 224163 in connection with coolant leakage, low heater output, and possible ID49 messaging.
  3. The supplied verified evidence does not establish further owner-performed diagnostic steps.

11. When to contact service

Contact a BMW service center or qualified EV service facility for diagnosis, particularly if coolant is leaking, heater output is low, or ID49 is displayed.

12. What the service center may check

  • Confirm the presence and context of fault code 224163.
  • Evaluate the vehicle using BMW bulletin B170124, as applicable.
  • Assess reported coolant leakage, low heater output, and any Check Control message. Specific diagnostic procedures are not established by the supplied verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied bulletin summaries identify affected conditions and related stored faults but do not provide a verified repair procedure in the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • BMW bulletin B170124, reported to NHTSA as Manufacturer Communication 10253344 (published April 26, 2024).
  • BMW bulletin B170124, reported to NHTSA as Manufacturer Communication 11014035 (published February 3, 2025).
  • BMW bulletin B170124, reported to NHTSA as Manufacturer Communication 11014422 (published February 11, 2025).
  • BMW bulletin B170124, reported to NHTSA as Manufacturer Communication 11016419 (published March 31, 2025).
  • BMW bulletin B170124, reported to NHTSA as Manufacturer Communication 11029046 (published February 25, 2026).

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official evidence consists of BMW manufacturer communication B170124 filed with NHTSA. The bulletin applies to listed BEV vehicles and identifies 224163 as a possible stored fault code when coolant leakage under the vehicle, low heater output, and/or possible “Drive, you can continue driving” (ID49) messaging is present.

19. Frequently asked questions

What does BMW code 224163 mean?

It means: “Electric auxiliary heater for the high-voltage battery unit: Undervoltage or internal communication fault.”

Can code 224163 be associated with a coolant leak?

Yes. BMW bulletin B170124 lists coolant leaking from under the vehicle among the conditions associated with possible stored code 224163.

Can I continue driving with 224163?

Not yet established by verified evidence. The bulletin lists a possible ID49 message stating “Drive, you can continue driving,” but this does not establish that continued driving is appropriate in every case.

Which vehicles are covered by the supplied applicability evidence?

US-market BMW i4, i5, i7, and iX vehicles within the supplied 2022–2025 model-year applicability ranges. Exact applicability should be confirmed by VIN and bulletin review.

20. Sources & verification

Accepted ResearchVerified
BMW 224163: Electric auxiliary heater for the high-voltage battery… | EV Diagnostics