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Land Rover B1DC5-93

JLR are currently investigating the root cause Action: 1. Clear all DTCs Conduct autoscan on HVAC module 2. Conduct autoscan on HVAC module 3. Check if DTC B1DC5-93 is still presen

Common search variants: B1DC593 · B1DC5 93 · B1DC5_93 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Land Rover/Jaguar Land Rover service provider if B1DC5-93 is present or returns after clearing. The official communication requires approved diagnostic equipment and result storage in the Vf database.
Confidence95%

Quick answer

B1DC5-93 is a Land Rover HVAC-module DTC covered by JLR Service Message SSM75186. JLR stated that it was investigating the root cause at the time of publication.

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 B1DC5-93 mean?

B1DC5-93 is a Land Rover HVAC-module DTC covered by JLR Service Message SSM75186. JLR stated that it was investigating the root cause at the time of publication.

2. Technical explanation

Verified evidence identifies this as DTC B1DC5-93 logged in the HVAC module. The official communication directs technicians to clear DTCs, run an HVAC-module autoscan, determine whether B1DC5-93 returns, and, if it remains present, read High Voltage Coolant Heater #1 – Overheat Count (22 9A 3C) using approved diagnostic equipment and store results in the Vf database. The supplied evidence does not establish the underlying component failure or a final repair.

3. What system is affected?

HVAC module; the official diagnostic procedure references High Voltage Coolant Heater #1.

4. How serious is this code?

Unknown. No severity classification is established by the supplied verified evidence.

5. Symptoms you may notice

  • The official communication identifies B1DC5-93 as logged in the HVAC module.
  • No driver-observable symptoms are established by the supplied verified evidence.

6. Possible causes

  • JLR stated it was investigating the root cause.
  • No specific cause is established by the supplied verified evidence.

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 by a Land Rover/Jaguar Land Rover service provider using approved diagnostic equipment.
  • Do not attempt high-voltage coolant-heater diagnosis or repair yourself.

10. Step-by-step troubleshooting

  1. The official procedure calls for clearing all DTCs and conducting an HVAC-module autoscan.
  2. Check whether B1DC5-93 is still present after the autoscan.
  3. If the DTC remains present, the official procedure calls for reading High Voltage Coolant Heater #1 – Overheat Count (22 9A 3C) with Jaguar Land Rover approved diagnostic equipment.
  4. The official procedure calls for storing the results on the Vf database.
  5. The supplied source additionally references switching on the climate panel, pressing the brake pedal and start switch until READY is displayed, followed by approved-equipment datalog checks; the supplied evidence summary does not include the complete list of datalog items.

11. When to contact service

Contact a Land Rover/Jaguar Land Rover service provider if B1DC5-93 is present or returns after clearing. The official communication requires approved diagnostic equipment and result storage in the Vf database.

12. What the service center may check

  • Clear all DTCs.
  • Conduct an autoscan on the HVAC module.
  • Confirm whether B1DC5-93 remains present.
  • If present, read High Voltage Coolant Heater #1 – Overheat Count (22 9A 3C).
  • Store results on the Vf database.
  • Carry out the referenced approved-equipment datalog checks; the complete parameters are not included in the supplied evidence.

13. Possible repair or resolution

  • No repair resolution is established by the supplied verified evidence.
  • JLR was investigating the root cause when SSM75186 was published.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 10202938, JLR SSM75186, published October 13, 2021. It addresses DTC B1DC5-93 logged in the HVAC module for specified PHEV variants.

16. Recall information

  • No recall information is established by the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10202938, JLR SSM75186: https://static.nhtsa.gov/odi/tsbs/2021/MC-10202938-0001.pdf

19. Frequently asked questions

What does B1DC5-93 mean?

The verified source identifies it as a DTC logged in the HVAC module. It does not provide a final root-cause definition.

What vehicles are covered by the supplied evidence?

Land Rover Range Rover, model years 2020–2021, US market, with the official communication describing 2020 model year onward PHEV variants of L405, L494, L551, L550 and L560.

Is there a confirmed fix?

No. The supplied official communication says JLR was investigating the root cause and provides a diagnostic data-collection process rather than a confirmed repair.

Is it safe to drive or charge?

Not yet established by verified evidence.

20. Sources & verification

Verified
Land Rover B1DC5-93: JLR are currently investigating the root cause… | EV Diagnostics