Nissan U1001
Module was not connected Module has internal issue Module is not installed Wrong Part Number Module is not programmed Wrong configuration Go to A on page 4 Go to B on p
Quick answer
For applicable US Nissan Leaf vehicles, U1001 is listed in Nissan CAN-network troubleshooting material. Verified evidence directs diagnosis toward module connection, installation, internal condition, part number, programming, and configuration; it does not establish a single fault cause for every vehicle.
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 U1001 mean?
For applicable US Nissan Leaf vehicles, U1001 is listed in Nissan CAN-network troubleshooting material. Verified evidence directs diagnosis toward module connection, installation, internal condition, part number, programming, and configuration; it does not establish a single fault cause for every vehicle.
2. Technical explanation
Nissan bulletin NTB13-027C lists U1001 with U1000, U1002, and other CAN-related DTCs in its troubleshooting flowchart. The bulletin states that, when no current DTCs are shown, the bulletin does not apply and intermittent-issue diagnosis should be performed using the Electronic Service Manual. For the U1001 group, the verified bulletin evidence identifies these checks: whether a module was connected, whether it has an internal issue, whether it is installed, whether the part number is correct, whether it is programmed, and whether its configuration is correct.
3. What system is affected?
CAN communication/network diagnostics. A more specific affected module or vehicle system is not established by verified evidence.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- A module was not connected.
- A module has an internal issue.
- A module is not installed.
- A wrong part number is fitted.
- A module is not programmed.
- A module has the wrong configuration.
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 current DTCs checked with appropriate diagnostic equipment.
- If no current DTCs are present, use the Nissan Electronic Service Manual for intermittent-issue diagnosis, as directed by the bulletin.
- Do not attempt high-voltage-system repair procedures without qualified EV service support.
10. Step-by-step troubleshooting
- Confirm whether U1001 or related CAN DTCs are current.
- Nissan NTB13-027C states that if no current DTCs are shown, the bulletin does not apply; refer to the Electronic Service Manual for intermittent diagnosis.
- For the U1001 CAN-DTC group, check module connection, installation, internal condition, part number, programming, and configuration.
- The bulletin flowchart also references CAN-bus wiring and termination-resistance evaluation; the supplied evidence does not establish a specific wiring or termination fault for U1001 in an individual vehicle.
11. When to contact service
Professional Nissan EV diagnostic service is appropriate if U1001 is current or returns after clearing. The verified bulletin directs module and CAN-network diagnosis rather than establishing a universal repair.
12. What the service center may check
- Read current DTCs with Nissan CONSULT or equivalent appropriate diagnostic equipment.
- Identify the module reporting the relevant CAN-related DTCs.
- Check module connection and installation.
- Verify module part number, programming status, and configuration.
- Evaluate the module for an internal issue.
- Use the Electronic Service Manual for intermittent concerns when no current DTCs are present.
13. Possible repair or resolution
- Not yet established by verified evidence for U1001. Repair depends on the results of the listed module and CAN-network checks.
14. Affected vehicles
- Nissan Leaf · 2011–2025 · US
- Nissan Leaf · 2011–2022 · US
15. Related TSBs / service bulletins
- Nissan NTB13-027C, published through NHTSA as Manufacturer Communication 10208946 on 2022-02-22. It includes a troubleshooting flowchart for U1000, U1001, U1002, and other CAN-related DTCs.
- Nissan NTB13-027D, published through NHTSA as Manufacturer Communication 11004961 on 2024-05-21. The supplied evidence summary also identifies U1001 among CAN-related DTCs and lists the same module-related checks.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Nissan communications: NTB13-027C: https://static.nhtsa.gov/odi/tsbs/2022/MC-10208946-0001.pdf ; NTB13-027D: https://static.nhtsa.gov/odi/tsbs/2024/MC-11004961-0001.pdf
19. Frequently asked questions
What does Nissan U1001 mean?
Verified Nissan bulletin evidence places U1001 in a group of CAN-related DTCs. The evidence identifies module connection, internal condition, installation, part number, programming, and configuration as diagnostic checks; it does not establish one universal meaning or failed component.
Does NTB13-027C apply if U1001 is not current?
No. The bulletin states that if no current DTCs are shown, the TSB does not apply and the Electronic Service Manual should be referenced for diagnosis of intermittent issues.
Does U1001 mean a module must be replaced?
Not yet established by verified evidence. The supplied bulletin evidence calls for checks of connection, installation, internal condition, part number, programming, and configuration.
Which vehicles are covered by the supplied applicability data?
The supplied verified applicability data identifies US Nissan Leaf model years 2011 through 2025. One supplied applicability record ends at 2022; another extends through 2025.