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Chevrolet P15FF

Battery Monitor Sensor Signal Message Counter Incorrect • P16DC: Battery Sensor Monitor Timer Performance (DTC P16DC disables the Stop/ Start System) • P305D: DC/DC Converter Crank

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Chevrolet dealer or qualified GM service provider, particularly if the MIL is illuminated or a “Stop/Start System Disabled” message is displayed.
Confidence95%

Quick answer

For certain 2021–2023 Chevrolet Bolt EV and Bolt EUV vehicles in the US, DTC P15FF is covered in GM bulletin 15-NA-087 alongside P16DC, P305D, P305E, U01B0, and U0284. The bulletin concerns an inoperative Stop/Start system, a “Stop/Start System Disabled” message, and/or an illuminated MIL. Driving and charging safety are not yet established by verified evidence.

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 P15FF mean?

For certain 2021–2023 Chevrolet Bolt EV and Bolt EUV vehicles in the US, DTC P15FF is covered in GM bulletin 15-NA-087 alongside P16DC, P305D, P305E, U01B0, and U0284. The bulletin concerns an inoperative Stop/Start system, a “Stop/Start System Disabled” message, and/or an illuminated MIL. Driving and charging safety are not yet established by verified evidence.

2. Technical explanation

P15FF is identified as “Battery Monitor Sensor Signal Message Counter Incorrect.” The supplied official bulletin evidence lists it among DTCs a technician may observe for a Stop/Start-system condition. The supplied evidence does not establish a specific failed component or repair procedure for P15FF.

3. What system is affected?

Battery monitor sensor/message communication and the Stop/Start system, based on the supplied bulletin evidence.

4. How serious is this code?

Unknown. Verified evidence does not provide a severity classification.

5. Symptoms you may notice

  • Stop/Start system is inoperative.
  • “Stop/Start System Disabled” message appears on the Driver Information Center (DIC).
  • Malfunction Indicator Lamp (MIL) is illuminated.

6. Possible causes

  • A specific cause 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 by a qualified Chevrolet/GM service provider.
  • Record any DIC messages and whether the MIL is illuminated.
  • Do not attempt high-voltage or battery-monitor-system repairs yourself.

10. Step-by-step troubleshooting

  1. A technician may use a scan tool to check for P15FF and the other DTCs listed in GM bulletin 15-NA-087.
  2. The supplied evidence does not establish additional owner-performed diagnostic steps.

11. When to contact service

Contact a Chevrolet dealer or qualified GM service provider, particularly if the MIL is illuminated or a “Stop/Start System Disabled” message is displayed.

12. What the service center may check

  • Scan for P15FF: Battery Monitor Sensor Signal Message Counter Incorrect.
  • Check for P16DC: Battery Sensor Monitor Timer Performance.
  • Check for P305D: DC/DC Converter Crank Control Circuit High Voltage.
  • Check for P305E: DC/DC Converter Crank Control Circuit Low Voltage.
  • Check for U01B0: Lost Communication with Battery Monitor Module.
  • Check for U0284, which is listed in the supplied bulletin evidence as a related lost-communication DTC.

13. Possible repair or resolution

  • A verified repair resolution is not provided in the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM bulletin 15-NA-087, published in NHTSA manufacturer communication PDF 10225708 on October 25, 2022. It applies in the supplied evidence to US-specification 2021–2023 Chevrolet Bolt EV and Bolt EUV vehicles and addresses Stop/Start-system conditions where P15FF and other listed DTCs may be observed.

16. Recall information

  • No recall information is provided in the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA manufacturer communication PDF 10225708, GM bulletin 15-NA-087: https://static.nhtsa.gov/odi/tsbs/2022/MC-10225708-0001.pdf

19. Frequently asked questions

What does P15FF mean?

P15FF means “Battery Monitor Sensor Signal Message Counter Incorrect.”

Which vehicles are supported by the supplied evidence?

US-market 2021–2023 Chevrolet Bolt EV and 2021–2023 Chevrolet Bolt EUV.

Can P15FF disable Stop/Start?

The supplied bulletin lists P15FF among DTCs that may be observed with an inoperative Stop/Start system. It specifically states that P16DC disables the Stop/Start system; it does not specifically state that P15FF alone disables it.

Is it safe to drive or charge with P15FF?

Not yet established by verified evidence.

20. Sources & verification

Verified
Chevrolet P15FF: Battery Monitor Sensor Signal Message Counter… | EV Diagnostics