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Nissan P18B1

1. Confirm the curre

DriveUnknown. The diagnostic record lists safe-to-drive status as unknown.
ChargeUnknown. The diagnostic record lists safe-to-charge status as unknown.
ServiceService evaluation is appropriate because Nissan NTB24-012 provides a service procedure for this DTC condition. The supplied evidence does not establish urgency or driving restrictions.
Confidence95%

Quick answer

For a 2018–2022 Nissan Leaf in the US, Nissan bulletin NTB24-012 addresses DTC P18B1 when it is stored in the Shift Control Unit for “CONTROL MODULE.” The supplied evidence does not include the full diagnostic meaning or repair procedure.

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 P18B1 mean?

For a 2018–2022 Nissan Leaf in the US, Nissan bulletin NTB24-012 addresses DTC P18B1 when it is stored in the Shift Control Unit for “CONTROL MODULE.” The supplied evidence does not include the full diagnostic meaning or repair procedure.

2. Technical explanation

Verified evidence identifies P18B1 as a DTC covered by Nissan technical bulletin NTB24-012. The bulletin summary states that it applies if P18B1 for “CONTROL MODULE” is stored in the Shift Control Unit and directs technicians to follow the bulletin’s service procedure. The supplied bulletin excerpt is truncated after “Confirm the curre,” so further diagnostic steps, component identification, and repair details are not established by verified evidence.

3. What system is affected?

Shift Control Unit. The evidence references “CONTROL MODULE” in connection with P18B1, but does not further define the affected component or system.

4. How serious is this code?

Unknown. The diagnostic record lists severity as unknown.

5. Symptoms you may notice

Not yet established by verified evidence.

6. Possible causes

  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The diagnostic record lists safe-to-drive status as unknown.

8. Can I charge the vehicle?

Unknown. The diagnostic record lists safe-to-charge status as unknown.

9. What you can safely do

  • Have the vehicle evaluated using Nissan bulletin NTB24-012 if P18B1 is stored in the Shift Control Unit.
  • Do not infer a specific repair from the truncated bulletin summary.

10. Step-by-step troubleshooting

  1. Confirm whether DTC P18B1 for “CONTROL MODULE” is stored in the Shift Control Unit.
  2. Follow the service procedure in Nissan bulletin NTB24-012. The supplied evidence does not contain the complete procedure.

11. When to contact service

Service evaluation is appropriate because Nissan NTB24-012 provides a service procedure for this DTC condition. The supplied evidence does not establish urgency or driving restrictions.

12. What the service center may check

  • Confirm P18B1 is stored in the Shift Control Unit.
  • Use the complete Nissan NTB24-012 service procedure. Additional checks are not established by the supplied evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence. The source confirms that NTB24-012 contains a service procedure, but the supplied excerpt does not provide its repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Nissan NTB24-012, reported by NHTSA as Manufacturer Communication 10251538, published February 9, 2024. It addresses P18B1 stored in the Shift Control Unit for “CONTROL MODULE.”

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication 10251538, Nissan NTB24-012: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=10251538

19. Frequently asked questions

What does P18B1 mean on a Nissan Leaf?

The supplied verified evidence identifies P18B1 as a DTC addressed by Nissan bulletin NTB24-012 when stored in the Shift Control Unit for “CONTROL MODULE.” A complete plain-language definition is not established by the supplied evidence.

Which vehicles are covered by the supplied evidence?

The verified applicability record covers US-market Nissan Leaf vehicles from model years 2018 through 2022.

Is it safe to drive or charge with P18B1?

Not yet established by verified evidence. Both safe-to-drive and safe-to-charge status are listed as unknown.

Is there a Nissan service bulletin for P18B1?

Yes. Nissan NTB24-012 addresses P18B1 when it is stored in the Shift Control Unit for “CONTROL MODULE.”

20. Sources & verification

Accepted ResearchVerified
Nissan P18B1: 1. Confirm the curre | EV Diagnostics