Volvo P0B4A00
*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
Quick answer
For applicable 2016–2019 Volvo XC90 vehicles in the US, P0B4A00 is listed by Volvo in Technical Journal 33931 when present with one or more other cell-balance DTCs. The documented service is to load software product 31483293 for XC90/XC60; one version also directs a software update per TJ 31543 first.
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 P0B4A00 mean?
For applicable 2016–2019 Volvo XC90 vehicles in the US, P0B4A00 is listed by Volvo in Technical Journal 33931 when present with one or more other cell-balance DTCs. The documented service is to load software product 31483293 for XC90/XC60; one version also directs a software update per TJ 31543 first.
2. Technical explanation
Verified Volvo/NHTSA Technical Journal 33931 identifies P0B4A00 as one of these cell-balance DTCs: P0B3B00, P0B4000, P0B4500, P0B4A00, P0B4F00, and P0B5400. The journal addresses a condition where one or more of these codes occur in combination with one or more of P0C7600 (System Discharge Time Too Long), P0CA400 (Charging Voltage High), or U029A00 (Lost Communication with Sensor Module). It also covers irregular or low electrical distance shown in the driver information module. The supplied evidence does not define the standalone technical meaning of P0B4A00 or establish a component failure.
3. What system is affected?
Not yet established by verified evidence. Volvo’s bulletin groups P0B4A00 among cell-balance diagnostic trouble codes.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- P0B4A00 may be stored with other cell-balance DTCs, according to Volvo Technical Journal 33931.
- The bulletin covers cases involving P0C7600, P0CA400, or U029A00 in combination with one or more listed cell-balance DTCs.
- The bulletin also covers irregular or low electrical distance displayed in the driver information module.
6. Possible causes
- Not yet established by verified evidence. The supplied Volvo bulletin documents a software-service action but does not establish a physical root cause for P0B4A00.
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 service provider.
- Provide the stored DTCs and ask the provider to review Volvo Technical Journal 33931 and applicable software status.
- Do not attempt high-voltage battery or sensor-module repairs yourself.
10. Step-by-step troubleshooting
- Have a qualified Volvo technician confirm all stored DTCs and whether P0B4A00 is present with the code combinations described in Technical Journal 33931.
- Have the technician check whether the vehicle is eligible for the software procedure specified in the bulletin.
- For the irregular/low electrical-distance issue, the bulletin states that a 12 V battery reset may be necessary after software loading.
11. When to contact service
Contact an authorized Volvo service provider for diagnosis and software applicability. The supplied evidence does not establish urgency, driving safety, or charging safety.
12. What the service center may check
- Confirm the vehicle is a US-market 2016–2019 Volvo XC90 within the supplied applicability record.
- Read and record all diagnostic trouble codes, including whether P0C7600, P0CA400, U029A00, or other listed cell-balance codes are present.
- Review Technical Journal 33931 and the vehicle’s installed software status.
- For irregular or low displayed electrical distance, consider the bulletin’s stated possibility that a 12 V battery reset may be needed after software loading.
13. Possible repair or resolution
- Volvo Technical Journal 33931 specifies software product 31483293 for XC90/XC60.
- TJ33931c states to update vehicle software according to TJ 31543, then load the specified software product.
- TJ33931b states to load software product 31483293 for XC90/XC60.
- The supplied evidence does not establish whether software loading alone resolves every occurrence of P0B4A00.
14. Affected vehicles
- Volvo XC90 · 2016–2019 · US
15. Related TSBs / service bulletins
- Volvo Technical Journal 33931, NHTSA manufacturer communication MC-10234716-9999 (TJ33931c), published 2018-09-18. It lists P0B4A00 among cell-balance DTCs and directs software update per TJ 31543 followed by the applicable software product.
- Volvo Technical Journal 33931, NHTSA manufacturer communication MC-10234715-9999 (TJ33931b), published 2019-02-04. It lists P0B4A00 among cell-balance DTCs and directs loading software product 31483293 for XC90/XC60.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Volvo communication: https://static.nhtsa.gov/odi/tsbs/2018/MC-10234716-9999.pdf
19. Frequently asked questions
What does Volvo’s bulletin say about P0B4A00?
It lists P0B4A00 as one of several cell-balance DTCs covered when present with specified additional DTC conditions.
Which software product is specified for an XC90?
Technical Journal 33931 specifies software product 31483293 for XC90/XC60.
Does the evidence confirm that P0B4A00 alone requires a particular repair?
No. The supplied evidence addresses P0B4A00 in combination with other described diagnostic conditions and does not establish a standalone repair.
Can I safely drive or charge with P0B4A00?
Not yet established by verified evidence.