U3002: Vehicle Identification Number

What it means

The control module reports a problem with the stored Vehicle Identification Number (VIN) — missing, mismatched between modules, or invalid format.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Vehicle modules may store or check the vehicle identification number so they can confirm the vehicle's identity and coordinate functions. U3002 indicates that the reporting module finds the VIN missing, invalid, or inconsistent with the vehicle's other modules.

Common causes

Most likely first.

1. VIN mismatch after module replacement
2. VIN not programmed in replacement module
3. Gateway module routing CAN messages incorrectly

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan all modules and identify which one stored U3002, then compare the VIN reported by each module with the VIN on the vehicle.
2. Review freeze-frame and service history for recent module replacement, programming, or configuration changes.
3. Check whether the reporting module shows a blank or malformed VIN in scan-tool identification data.
4. Inspect network and gateway communication for faults that could prevent modules from sharing the stored VIN.
5. If a replacement module is involved, verify its configuration and VIN programming requirements in the manufacturer's service information before changing stored data.

Common fixes

• Program the correct VIN into a replacement module using the manufacturer's approved procedure.
• Correct an invalid VIN entry or module configuration where supported by the vehicle's service procedure.
• Repair a network or gateway fault preventing VIN information from reaching the affected module.
• Replace a module only if its VIN storage or programming function is faulty after network and configuration checks.

Can I keep driving?

The vehicle may drive normally, but some functions or inspection and service procedures can be affected by a VIN mismatch. Arrange correction soon, especially if warning lights or module-related features are affected.