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Volvo P059900

If any of above DTC´s are set in the ECM or CEM for the pre-heated thermostat in the cooling system, and/or if the customer complains of a charging system warning message in the Dr

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Volvo retailer or qualified Volvo service provider for diagnosis, especially if a charging-system warning message is present.
Confidence95%

Quick answer

For a 2016 Volvo XC90 in the US, DTC P059900 is covered by Volvo Technical Journal TJ30268.6.0-2017. The bulletin associates it with the pre-heated thermostat in the cooling system and may also apply when a charging-system warning message is displayed in the driver information display.

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 P059900 mean?

For a 2016 Volvo XC90 in the US, DTC P059900 is covered by Volvo Technical Journal TJ30268.6.0-2017. The bulletin associates it with the pre-heated thermostat in the cooling system and may also apply when a charging-system warning message is displayed in the driver information display.

2. Technical explanation

The verified source lists P059900 as an intermittent ECM DTC. Its description states that the journal applies when listed ECM or CEM DTCs are set for the pre-heated thermostat in the cooling system, and/or when the customer reports a charging-system warning message in the driver information display. The supplied evidence does not establish a more specific fault mechanism for P059900.

3. What system is affected?

Pre-heated thermostat in the cooling system; the verified bulletin also references the ECM and CEM and a possible charging-system warning message.

4. How serious is this code?

Unknown. Severity is not established by the verified evidence.

5. Symptoms you may notice

  • P059900 stored as an intermittent ECM DTC.
  • A charging-system warning message in the driver information display may be reported.

6. Possible causes

  • Not yet established by verified evidence. The official bulletin associates the DTC with the pre-heated thermostat in the cooling system but does not establish a specific root cause in the supplied 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 Volvo-qualified service provider.
  • Record any charging-system warning message and the conditions under which it appears.
  • Have stored DTCs read using VIDA, as referenced by the official bulletin.

10. Step-by-step troubleshooting

  1. Use VIDA to read and reset diagnostic trouble codes, as referenced in Technical Journal TJ30268.6.0-2017.
  2. Consult the latest online version of the Volvo Technical Journal before diagnosis or repair; the bulletin notes that printed copies may not be current.
  3. Do not perform high-voltage or cooling-system repair procedures without appropriate training and service information.

11. When to contact service

Contact a Volvo retailer or qualified Volvo service provider for diagnosis, especially if a charging-system warning message is present.

12. What the service center may check

  • Read and reset/confirm DTCs with VIDA.
  • Check the latest online version of Volvo Technical Journal TJ30268.6.0-2017.
  • Evaluate the pre-heated thermostat cooling-system concern according to Volvo service procedures.

13. Possible repair or resolution

  • The official bulletin’s labor description includes thermostat replacement and VIDA DTC read/reset/known-DTC operations.
  • Whether thermostat replacement is required for an individual vehicle is not established by the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Volvo Technical Journal TJ30268.6.0-2017, published through NHTSA as Manufacturer Communication PDF 10168505 on 2017-04-04. It lists ECM P059900 as intermittent and concerns the pre-heated thermostat in the cooling system and/or a charging-system warning message.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10168505, Volvo Technical Journal TJ30268.6.0-2017: https://static.nhtsa.gov/odi/tsbs/2017/MC-10168505-9999.pdf

19. Frequently asked questions

What vehicle is covered by the verified evidence?

The supplied applicability record identifies the 2016 Volvo XC90 in the US.

Is P059900 intermittent?

Yes. The official bulletin lists ECM P059900 as intermittent.

Does P059900 confirm that the thermostat must be replaced?

No. The bulletin includes thermostat replacement in its labor description, but the supplied evidence does not establish that replacement is required in every case.

Is it safe to drive or charge?

Not yet established by verified evidence.

20. Sources & verification

Verified
Volvo P059900: If any of above DTC´s are set in the ECM or CEM for the… | EV Diagnostics