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Nissan P31C2

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DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Nissan dealer or qualified service facility if P31C2 is stored with continuous 12-volt battery discharge and/or nonfunctional Remote Telematics services. Ask them to evaluate applicability of Nissan bulletin NTB18-045b.
Confidence95%

Quick answer

For a 2011–2015 Nissan LEAF (ZE0) in the US equipped with a 3G Tematics Control Unit (TCU), P31C2 may be stored with 12-volt battery discharge and/or inoperative Remote Telematics services. Nissan bulletin NTB18-045b directs technicians to first confirm bulletin applicability, then reprogram the TCU if applicable.

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 P31C2 mean?

For a 2011–2015 Nissan LEAF (ZE0) in the US equipped with a 3G Tematics Control Unit (TCU), P31C2 may be stored with 12-volt battery discharge and/or inoperative Remote Telematics services. Nissan bulletin NTB18-045b directs technicians to first confirm bulletin applicability, then reprogram the TCU if applicable.

2. Technical explanation

Verified evidence identifies P31C2 as a TCU-related DTC in Nissan’s NTB18-045b. The supplied diagnostic title/meaning is procedural text rather than a complete fault definition. The bulletin states that P31C2 and/or P3131 may be stored when the 12-volt battery continuously loses charge and/or Remote Telematics services do not work. The specified bulletin action, after confirming applicability through its service procedure, is TCU reprogramming.

3. What system is affected?

Telematics Control Unit (TCU) / Remote Telematics system. The bulletin also concerns 12-volt battery charging loss.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The 12-volt battery continuously loses its charge.
  • Remote Telematics services do not work.
  • P31C2 (TCU) may be stored.
  • P3131 may also be stored.

6. Possible causes

  • For the specific bulletin condition, Nissan’s verified corrective action is TCU reprogramming after confirming applicability. A more specific underlying cause is not yet established by the supplied 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

  • Have the vehicle evaluated using Nissan bulletin NTB18-045b applicability checks.
  • If the 12-volt battery is continuously losing charge, arrange service rather than assuming the stored DTC alone identifies the cause.
  • Do not perform high-voltage repairs based on this information.

10. Step-by-step troubleshooting

  1. Confirm the vehicle is a US-market 2011–2015 Nissan LEAF (ZE0).
  2. Confirm it is equipped with a 3G TCU.
  3. Confirm the bulletin’s stated condition: continuous 12-volt battery charge loss and/or Remote Telematics services not working.
  4. Check whether P31C2 and/or P3131 are stored.
  5. Follow the bulletin service procedure to determine whether NTB18-045b applies.

11. When to contact service

Contact a Nissan dealer or qualified service facility if P31C2 is stored with continuous 12-volt battery discharge and/or nonfunctional Remote Telematics services. Ask them to evaluate applicability of Nissan bulletin NTB18-045b.

12. What the service center may check

  • Verify model year, vehicle configuration, and 3G TCU equipment.
  • Verify the reported 12-volt battery and/or Remote Telematics condition.
  • Retrieve stored DTCs, including P31C2 and P3131.
  • Perform the bulletin’s applicability confirmation before carrying out the prescribed action.

13. Possible repair or resolution

  • If NTB18-045b applies, reprogram the Telematics Control Unit (TCU).
  • The supplied evidence does not establish any other repair.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Nissan NTB18-045b, published September 28, 2018; NHTSA manufacturer communication MC-10145516. Applies to US 2011–2015 LEAF (ZE0) vehicles equipped with a 3G TCU. It supersedes previous bulletin versions and specifies confirmation of applicability followed by TCU reprogramming if applicable.
  • Nissan NTB18-045a, published September 11, 2018; NHTSA manufacturer communication MC-10150732. This is an earlier version; the supplied evidence states to discard previous versions.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA-hosted Nissan manufacturer communication NTB18-045b (MC-10145516): https://static.nhtsa.gov/odi/tsbs/2018/MC-10145516-9999.pdf

19. Frequently asked questions

What does P31C2 mean on an applicable Nissan LEAF?

The verified bulletin identifies P31C2 as a TCU-related DTC. The supplied diagnostic title is not a complete technical definition.

Which vehicles does the bulletin apply to?

US 2011–2015 Nissan LEAF (ZE0) vehicles equipped with a 3G TCU.

What symptoms are identified in the bulletin?

Continuous loss of 12-volt battery charge and/or Remote Telematics services that do not work.

What repair does Nissan specify if the bulletin applies?

After confirming applicability using the bulletin service procedure, Nissan specifies reprogramming the TCU.

Is P31C2 a recall?

No recall is established by the supplied verified evidence.

20. Sources & verification

Verified
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