U0493: Invalid Data Received From Personal Computer

What it means

A control module received invalid data from the personal computer module. The code identifies a data validity fault; the specific affected function depends on the vehicle.

How it works

The personal computer module provides a vehicle-specific computer-related function and sends status data to other modules over the network. U0493 sets when a receiving control module rejects data from that computer module as invalid.

Common causes

Most likely first.

1. Fault in the transmitting module
2. Network wiring or connector fault
3. Module power or ground fault
4. Software or configuration mismatch

Symptoms

• The connected computer-related function may not work correctly
• Related communication codes may appear

How to diagnose it

1. Scan all modules and save freeze-frame details, noting which module logged U0493 and any related communication codes.
2. Identify the vehicle function associated with the personal computer module and check which connected features fail or behave inconsistently.
3. Inspect the computer module’s connector and accessible network wiring for looseness, corrosion, moisture, or damage.
4. Check the module’s power and ground using the manufacturer’s procedure before suspecting an internal fault.
5. Use a vehicle-capable scan tool to review the module’s reported status and check for software or configuration mismatch after replacement or service.
6. If connections and supply are sound, follow the manufacturer’s network tests to isolate the computer module from a gateway routing issue.

Common fixes

• Reconnect or repair a loose or damaged computer module connector or network wire.
• Repair the module’s power or ground connection.
• Correct software or configuration mismatches after module replacement.
• Replace the computer module or repair the gateway only after testing confirms the fault source.

Can I keep driving?

If the fault only affects the computer-related feature, driving is generally unaffected. If other vehicle systems show warnings or stop working, have those symptoms checked promptly.