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Volvo U029600

If above Diagnostic Trouble Codes (DTCs) are set, follow advice under “Service”. ERAD=Electric Rear Axle Drive IEM = Inverter ERAD Module SERVICE: Revised IEM software has been rel

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Volvo retailer or qualified service facility for diagnosis and the documented IEM software update procedure.
Confidence95%

Quick answer

For applicable 2017–2018 Volvo S90, XC60, and XC90 vehicles in the US, U029600 is listed by Volvo Technical Journal 33723 as an intermittent DTC in the BCM. Volvo’s documented service direction is to update Inverter ERAD Module (IEM) software according to TJ 31543, test the vehicle, and check whether the DTC returns.

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 U029600 mean?

For applicable 2017–2018 Volvo S90, XC60, and XC90 vehicles in the US, U029600 is listed by Volvo Technical Journal 33723 as an intermittent DTC in the BCM. Volvo’s documented service direction is to update Inverter ERAD Module (IEM) software according to TJ 31543, test the vehicle, and check whether the DTC returns.

2. Technical explanation

The verified Volvo technical-journal evidence identifies ERAD as Electric Rear Axle Drive and IEM as Inverter ERAD Module. In Technical Journal 33723, U029600 is listed as an intermittent code in the BCM. The journal states that revised IEM software has been released and directs technicians to perform a software upgrade according to TJ 31543, then test the vehicle and check whether listed DTCs return.

3. What system is affected?

Verified evidence associates this bulletin with the BCM code U029600 and the ERAD/IEM system. ERAD means Electric Rear Axle Drive; IEM means Inverter ERAD Module.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • U029600 may be stored as an intermittent BCM DTC.
  • No driver-observable symptoms are established by the verified evidence.

6. Possible causes

  • Volvo’s verified bulletin documents revised IEM software as the initial service action.
  • A specific underlying cause of U029600 is not yet established by 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 with an authorized Volvo retailer or qualified service facility.
  • Provide the stored code U029600 and reference Volvo Technical Journal 33723 when booking service.
  • Do not attempt high-voltage or inverter repairs yourself.

10. Step-by-step troubleshooting

  1. Confirm whether the vehicle is a US-market 2017–2018 Volvo S90, XC60, or XC90.
  2. Have a qualified technician retrieve and document stored DTCs.
  3. For the listed DTC condition, Volvo directs an IEM software upgrade according to TJ 31543.
  4. After the software upgrade, test the vehicle and check whether U029600 or any listed DTC returns.

11. When to contact service

Contact an authorized Volvo retailer or qualified service facility for diagnosis and the documented IEM software update procedure.

12. What the service center may check

  • Check for U029600 in the BCM.
  • Perform the IEM software upgrade according to Volvo TJ 31543.
  • Test the vehicle after the upgrade.
  • Check whether U029600 or other listed DTCs return.

13. Possible repair or resolution

  • Volvo Technical Journal 33723 directs an IEM software upgrade according to TJ 31543.
  • The supplied evidence is truncated after stating that further action is needed if a DTC returns; the specific follow-up repair is not established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Volvo Technical Journal 33723, revision 1.0, dated 2018-05-08. NHTSA manufacturer communication 10149954: https://static.nhtsa.gov/odi/tsbs/2018/MC-10149954-9999.pdf
  • Volvo Technical Journal 33723, revision 1.0, published through NHTSA manufacturer communication 10164136, dated 2018-05-15: https://static.nhtsa.gov/odi/tsbs/2018/MC-10164136-9999.pdf

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Applicable verified evidence: Volvo Technical Journal 33723.1.0, published through NHTSA manufacturer communications 10149954 and 10164136. The bulletin applies in the supplied data to US-market 2017–2018 Volvo S90, XC60, and XC90 vehicles.

19. Frequently asked questions

What does U029600 mean in this Volvo bulletin?

It is listed as an intermittent DTC in the BCM. The bulletin associates the service procedure with the ERAD/IEM system, where ERAD means Electric Rear Axle Drive and IEM means Inverter ERAD Module.

What is Volvo’s documented repair direction?

Volvo directs technicians to upgrade IEM software according to TJ 31543, test the vehicle, and check whether the DTC returns.

Does this bulletin prove that the IEM hardware has failed?

No. The verified evidence documents a software-update-first service action; it does not establish an IEM hardware failure.

Can I continue driving or charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Volvo U029600: If above Diagnostic Trouble Codes (DTCs) are set,… | EV Diagnostics