Nissan U1002
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 U.S. Nissan LEAF model years 2011–2025, U1002 is addressed in Nissan bulletin NTB13-027C/D as a CAN-related DTC. The bulletin directs checks for module connection, installation, internal condition, part number, programming, and configuration.
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1. What does U1002 mean?
For applicable U.S. Nissan LEAF model years 2011–2025, U1002 is addressed in Nissan bulletin NTB13-027C/D as a CAN-related DTC. The bulletin directs checks for module connection, installation, internal condition, part number, programming, and configuration.
2. Technical explanation
Nissan’s published CAN troubleshooting flowchart groups U1002 with U1000, U1001, and other CAN-related DTCs. The provided evidence does not establish one unique failure meaning for U1002 alone. It does establish that Nissan directs technicians to consider whether a module was not connected, has an internal issue, is not installed, has the wrong part number, is not programmed, or has the wrong configuration. The bulletin also states that, when no current DTCs are shown, the bulletin does not apply and the Electronic Service Manual should be referenced for intermittent-issue diagnosis.
3. What system is affected?
CAN-related vehicle module communication/diagnostic system. A more specific affected module is not established by the supplied evidence.
4. How serious is this code?
Unknown. Severity is not 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.
- Wrong part number.
- A module is not programmed.
- 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 the vehicle evaluated using Nissan diagnostic procedures if U1002 is current.
- Do not attempt high-voltage system repair based on this code alone.
10. Step-by-step troubleshooting
- Use CONSULT to determine which current CAN DTCs are present, as described in Nissan bulletin NTB13-027C/D.
- If no current DTCs are shown, Nissan states that this bulletin does not apply; refer to the Electronic Service Manual for intermittent-issue diagnosis.
- For the CAN-related DTC path that includes U1002, inspect module connection, installation status, part number, programming, and configuration, following Nissan procedures.
- The bulletin’s flowchart also references CAN-bus wiring and termination-resistance evaluation; no vehicle-specific test values or procedures were supplied in the evidence.
11. When to contact service
Service evaluation is appropriate because Nissan’s procedure involves CONSULT diagnosis and module installation, part-number, programming, and configuration checks.
12. What the service center may check
- Identify current DTCs with CONSULT.
- Determine whether all diagnostic CAN modules are listed consistently, per the Nissan flowchart.
- Check whether the relevant module is connected and installed.
- Check for an internal module issue.
- Verify the module part number.
- Verify module programming.
- Verify module configuration.
- Evaluate CAN-bus wiring and termination resistance as directed by the Nissan flowchart.
13. Possible repair or resolution
- The verified evidence does not establish a single repair for U1002.
- Correct the identified module connection, installation, part-number, programming, or configuration issue according to Nissan procedures.
- Nissan’s flowchart states to replace the module that sets U1010; this instruction is specifically stated for U1010 and is not established as a direct repair instruction for U1002 alone.
14. Affected vehicles
- Nissan Leaf · 2011–2025 · US
- Nissan Leaf · 2011–2022 · US
15. Related TSBs / service bulletins
- Nissan NTB13-027C, published through NHTSA manufacturer communication 10208946 on 2022-02-22. It includes U1002 in a CAN-related DTC troubleshooting flowchart.
- Nissan NTB13-027D, published through NHTSA manufacturer communication 11004961 on 2024-05-21. The supplied summary includes U1002 among CAN-related DTCs and the same module-related checks.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Nissan bulletin: NTB13-027D, https://static.nhtsa.gov/odi/tsbs/2024/MC-11004961-0001.pdf. Earlier revision: NTB13-027C, https://static.nhtsa.gov/odi/tsbs/2022/MC-10208946-0001.pdf.
19. Frequently asked questions
What does U1002 mean on a Nissan LEAF?
The supplied Nissan evidence classifies U1002 as a CAN-related DTC and directs checks of module connection, internal condition, installation, part number, programming, and configuration. A unique U1002-only definition is not established by the supplied evidence.
Which Nissan LEAF vehicles are covered by the supplied evidence?
The supplied applicability records identify U.S. Nissan LEAF vehicles from model years 2011–2025. The evidence also includes an overlapping 2011–2022 applicability record.
Can I drive or charge with U1002?
Not yet established by verified evidence.
Does U1002 always require module replacement?
Not yet established by verified evidence. The supplied Nissan flowchart specifically says to replace the module that sets U1010, but that is not a verified direct instruction for U1002 alone.