U0499: Invalid Data Received From Telematic Control Module

What it means

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

How it works

The telematic control module sends connected-service and vehicle-status data to other modules over the network. U0499 sets when a receiving module considers data from the telematic module invalid; the exact affected service depends on the vehicle.

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

• Telematics functions may not work correctly
• Related communication codes or system warnings may appear

How to diagnose it

1. Use a scan tool to save freeze-frame details and check whether U0499 is current or returns, since a temporary network interruption can set it.
2. Check for related telematics, infotainment, or network codes and note which connected functions are unavailable.
3. Inspect the telematic module's connectors and network wiring for loose pins, corrosion, damage, or chafing.
4. Check module power and ground using the manufacturer's diagnostic procedure, because a supply fault can disrupt transmitted data.
5. If wiring and supplies are sound, use vehicle-specific tests to assess the telematic module and confirm its software and configuration.

Common fixes

• Reconnect or clean a loose or corroded telematic-module connector.
• Repair damaged network wiring to the telematic module.
• Repair a poor module power or ground connection.
• Correct telematic-module software or configuration if specified for the vehicle.
• Replace the telematic control module if testing confirms it is faulty.

Can I keep driving?

Connected services or related warnings may be unavailable, while this code alone usually does not affect driving. Do not rely on telematics for emergency communication until the fault is resolved.