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Land Rover B1646

01 stored in the Gateway Module (GWM) and DTC C508D-01 stored in the Chassis Control Module B (CHCMB). Cause: EESM software calibration error. Action: Follow the below instructions

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Land Rover service provider for TOPIx Cloud diagnosis and the applicable on-screen procedure.
Confidence95%

Quick answer

For the verified US 2022–2023 Land Rover Range Rover applicability, B1646-01 stored in the Gateway Module can occur with an EESM software calibration error. Land Rover directs diagnosis through TOPIx Cloud under the Vehicle Dynamic Suspension symptom path.

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 B1646 mean?

For the verified US 2022–2023 Land Rover Range Rover applicability, B1646-01 stored in the Gateway Module can occur with an EESM software calibration error. Land Rover directs diagnosis through TOPIx Cloud under the Vehicle Dynamic Suspension symptom path.

2. Technical explanation

Verified manufacturer communications describe B1646-01 in the Gateway Module (GWM), together with C508D-01 in the Chassis Control Module B (CHCMB). They also describe U3000-49 stored in the Electrical Energy Storage Module (EESM) and Electric Power Inverter Converter Control Module E (EPICE). The stated status/cause is an EESM software calibration error.

3. What system is affected?

Gateway Module (GWM), Electrical Energy Storage Module (EESM), Electric Power Inverter Converter Control Module E (EPICE), and Chassis Control Module B (CHCMB). The prescribed diagnostic path is under Vehicle Dynamic Suspension.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Suspension warning lamp illuminated.
  • Instrument Panel Cluster message: “Stop safely and switch off – suspension fault detected.”

6. Possible causes

  • EESM software calibration error.

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 using JLR TOPIx Cloud Diagnostics.
  • Follow the TOPIx Cloud symptom path: Fault and Breakdown > Symptoms > Chassis > Warnings > Warning Light / Lamp Illuminated > Vehicle Dynamic Suspension.
  • Do not attempt high-voltage system repair procedures.

10. Step-by-step troubleshooting

  1. A JLR-approved battery support unit and JLR-approved diagnostic unit are specified in the manufacturer communication.
  2. Within TOPIx Cloud, select Fault and Breakdown > Symptoms > Chassis > Warnings > Warning Light / Lamp Illuminated > Vehicle Dynamic Suspension.
  3. Follow the on-screen prompts.

11. When to contact service

Contact an authorized Land Rover service provider for TOPIx Cloud diagnosis and the applicable on-screen procedure.

12. What the service center may check

  • Confirm whether B1646-01 is stored in the Gateway Module.
  • Check for C508D-01 in the Chassis Control Module B.
  • Check for U3000-49 in the EESM and EPICE.
  • Use the specified TOPIx Cloud Vehicle Dynamic Suspension diagnostic path.

13. Possible repair or resolution

  • The verified communications direct the technician to follow the TOPIx Cloud on-screen prompts. A specific repair outcome is not established by the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 10237536, SFCC_MAY2023_37, published May 11, 2023.
  • NHTSA Manufacturer Communication 10237545, SSM75970, published May 8, 2023.
  • NHTSA Manufacturer Communication 10235434, SFCC_APR2023_33, published April 21, 2023.
  • NHTSA Manufacturer Communication 10233820, SSM75970, published March 28, 2023.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2023/MC-10237536-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2023/MC-10237545-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2023/MC-10235434-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2023/MC-10233820-0001.pdf

19. Frequently asked questions

What does B1646-01 mean in this verified Land Rover guidance?

It is a DTC stored in the Gateway Module. The supplied manufacturer communications associate it with an EESM software calibration error in the described diagnostic scenario.

What warning may appear?

The supplied communications describe an illuminated suspension warning and the message “Stop safely and switch off – suspension fault detected.”

Which vehicles are covered by the supplied evidence?

US-market Land Rover Range Rover model years 2022–2023 and 2023 are listed in the supplied applicability evidence.

Is B1646-01 a recall?

Not yet established by verified evidence.

20. Sources & verification

Verified
Land Rover B1646: 01 stored in the Gateway Module (GWM) and DTC… | EV Diagnostics