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Volvo P0B4000

*Update vehicle software as per TJ 31543, then load software product (SP): XC90/XC60: 31483293 S90/V90: 31682449 S90L: 31472419 S60/V60: 32267765 2019-07-19 Page 3 of 3 Technical J

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Volvo retailer/service facility for diagnosis and software application.
Confidence95%

Quick answer

For applicable 2016–2019 US Volvo XC90 vehicles, P0B4000 is listed in Volvo Technical Journal 33931 as a Cell Balance diagnostic trouble code that may occur with one or more other listed codes. Volvo’s documented service direction is to load the specified software product; one bulletin version also directs software updating per TJ 31543 before loading the product.

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 P0B4000 mean?

For applicable 2016–2019 US Volvo XC90 vehicles, P0B4000 is listed in Volvo Technical Journal 33931 as a Cell Balance diagnostic trouble code that may occur with one or more other listed codes. Volvo’s documented service direction is to load the specified software product; one bulletin version also directs software updating per TJ 31543 before loading the product.

2. Technical explanation

Verified evidence does not establish a standalone plain-language definition for P0B4000 beyond its inclusion among Volvo’s listed “Cell Balance diagnostic trouble codes.” Volvo Technical Journal 33931 identifies P0B4000 together with P0B3B00, P0B4500, P0B4A00, P0B4F00, and P0B5400. The journal addresses cases where one or more of these codes occur in combination with P0C7600, P0CA400, or U029A00. The documented correction is a software product, rather than a component-level diagnosis in the supplied evidence.

3. What system is affected?

Battery cell-balance-related diagnostic area. The exact subsystem and component are not yet established by verified evidence.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • P0B4000 may be present with one or more listed cell-balance DTCs.
  • The journal also covers cases involving P0C7600, P0CA400, or U029A00.
  • Irregular or low electrical distance shown in the driver information module is listed in the journal, but the supplied evidence does not establish that it occurs specifically with P0B4000.

6. Possible causes

  • A specific underlying cause for P0B4000 is not yet established by verified evidence.
  • The supplied official communications identify a software product as the documented service action.

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 an authorized Volvo service facility.
  • Provide the technician with DTC P0B4000 and Technical Journal 33931.

10. Step-by-step troubleshooting

  1. Have a qualified Volvo technician confirm stored DTCs and determine whether the Technical Journal 33931 scenario applies.
  2. Have the technician follow the applicable Volvo software procedure identified in the bulletin.

11. When to contact service

Contact an authorized Volvo retailer/service facility for diagnosis and software application.

12. What the service center may check

  • Confirm whether P0B4000 is stored with one or more of P0B3B00, P0B4500, P0B4A00, P0B4F00, or P0B5400.
  • Confirm whether P0C7600, P0CA400, or U029A00 is also present.
  • Check whether the vehicle is eligible for the software product specified in Technical Journal 33931.

13. Possible repair or resolution

  • For XC90/XC60, the cited software product is 31483293.
  • One supplied TJ33931 version directs updating vehicle software per TJ 31543 before loading the software product.
  • The supplied evidence does not establish any hardware repair, battery replacement, or post-repair outcome for P0B4000.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Volvo Technical Journal 33931, NHTSA manufacturer communication MC-10234716-9999, published September 18, 2018. It lists P0B4000 among Cell Balance DTCs and directs software updating per TJ 31543 followed by the applicable software product.
  • Volvo Technical Journal 33931, NHTSA manufacturer communication MC-10234715-9999, published February 4, 2019. It lists P0B4000 among Cell Balance DTCs and directs loading the applicable software product.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Volvo manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2018/MC-10234716-9999.pdf and https://static.nhtsa.gov/odi/tsbs/2019/MC-10234715-9999.pdf

19. Frequently asked questions

What does Volvo P0B4000 mean?

The supplied Volvo bulletin classifies P0B4000 as one of several Cell Balance diagnostic trouble codes. A more specific standalone definition is not yet established by verified evidence.

Which vehicles are covered by the supplied applicability evidence?

The supplied applicability record identifies US-market Volvo XC90 model years 2016 through 2019.

What repair does Volvo document?

For XC90/XC60, Technical Journal 33931 specifies software product 31483293. One supplied bulletin version also calls for a software update per TJ 31543 before loading that product.

Is P0B4000 a recall?

No recall is established by the supplied verified evidence.

20. Sources & verification

Verified
Volvo P0B4000: *Update vehicle software as per TJ 31543, then load… | EV Diagnostics