U04B3: Invalid Data Received From Planetary Gear Set Control Module

What it means

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

At a glance

• Usually lights the warning light of the system that lost communication
• The engine or gearbox may go into limp mode

How it works

The planetary gear set control module reports operating information used by other modules to manage transmission or hybrid-drive functions. U04B3 is set when a receiving module gets data from that control module but judges the content invalid, which can prompt protective drive behavior.

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

• Transmission or hybrid drive operation may be affected
• Related communication codes or system warnings may appear

How to diagnose it

1. Save freeze-frame data and scan the transmission, hybrid, and other modules for related codes before clearing anything.
2. Check live data for planetary gear set control module messages and note whether values are implausible or marked invalid.
3. Inspect the module's connectors and network harness for corrosion, loose pins, fluid intrusion, or physical damage.
4. Check the planetary gear set control module's power and ground against the manufacturer's specification.
5. Test the applicable network wiring and connectors for opens, shorts, or poor connections using the vehicle wiring information.
6. If the network and supplies pass, check for software or configuration compatibility issues before considering module replacement.

Common fixes

• Clean and secure a loose or corroded planetary gear set control module connector.
• Repair damaged network wiring or connector terminals.
• Repair a faulty module power or ground connection.
• Correct a software or configuration mismatch with an applicable update or programming procedure.
• Replace the planetary gear set control module only if testing confirms it is transmitting invalid data.

Can I keep driving?

Avoid driving if the transmission or hybrid drive behaves abnormally, a warning appears, or the vehicle enters reduced-power mode; arrange recovery if gear selection or propulsion is unreliable. Continued use could worsen a driveline problem or leave the vehicle unable to move as expected.