Corroded, loose, or damaged wiring and connectors at the seat control module or along the network bus.; Faulty seat control module internally corrupting data due to water intrusion, circuit board damage, or component failure.; Low battery voltage or poor charging system performance causing modules to send invalid data during voltage spikes or drops.; Network bus faults (e.g., CAN bus shorts or opens) that corrupt messages between modules.; Software or firmware issues in the seat control module requiring recalibration or reprogramming.; Aftermarket accessories or improper electrical repairs introducing interference on the network.; Failed seat position sensor or motor causing the module to transmit out-of-range data.

DTC codes / U05xx · Network communication / U054D

U054DInvalid Data Received From Seat Control Module H

Q: What does code U054D mean?

Invalid Data Received From Seat Control Module H. U054D is a generic communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the seat control module responsible for the 'H' circuit or function. The computer detected a message from the seat control module that failed its internal validity check, such as a checksum error, out-of-range value, or missing expected data, rather than a complete loss of communication.

U054D is a generic communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the seat control module responsible for the 'H' circuit or function. The computer detected a message from the seat control module that failed its internal validity check, such as a checksum error, out-of-range value, or missing expected data, rather than a complete loss of communication.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

Illumination of the malfunction indicator lamp (MIL) or a body-related warning light on the dashboard.
Often no symptoms besides the warning light, as the seat may continue to operate normally.
Intermittent or complete failure of power seat adjustments for one or more positions.
Seat memory or easy-entry features may not recall or function correctly.
Other body control functions (e.g., mirrors, steering column) may act erratically if they share data with the seat module.
A stored U054D code may be accompanied by other U-codes indicating network communication issues.

Common causes, most likely first

Corroded, loose, or damaged wiring and connectors at the seat control module or along the network bus.
Faulty seat control module internally corrupting data due to water intrusion, circuit board damage, or component failure.
Low battery voltage or poor charging system performance causing modules to send invalid data during voltage spikes or drops.
Network bus faults (e.g., CAN bus shorts or opens) that corrupt messages between modules.
Software or firmware issues in the seat control module requiring recalibration or reprogramming.
Aftermarket accessories or improper electrical repairs introducing interference on the network.
Failed seat position sensor or motor causing the module to transmit out-of-range data.

How to diagnose and fix it

Verify battery voltage and charging system health; a weak battery can cause spurious communication codes.
Inspect and clean all seat control module connectors and network wiring for corrosion, looseness, or damage.
Perform a voltage drop test on the seat module's power and ground circuits to rule out resistance issues.
Use a scan tool to check for other stored codes and to monitor live data from the seat control module for invalid parameters.
If wiring and power are good, reprogram or recalibrate the seat control module with the latest software.
Substitute a known-good seat control module or perform a module swap test to confirm internal failure.
After repairs, clear codes and perform a road test to verify the code does not return.

Before you replace the seat control module

A common oversight is assuming the seat control module is defective when the real culprit is a chafed wire harness under the seat that intermittently shorts and corrupts data.
U054D can be set by a weak battery or poor ground connection, so always load-test the battery and check grounds before condemning any module.
The code may appear after jump-starting or battery replacement due to voltage spikes, and it might clear itself after a few drive cycles if no underlying fault exists.
Other modules on the same network can cause invalid data to be attributed to the seat module, so check for related U-codes across multiple systems.
Seat control modules often share data with memory mirrors and steering column, so a fault in those systems can trigger U054D indirectly.

Can I keep driving with U054D?

The vehicle is generally safe to drive because the fault typically affects only seat adjustment convenience features, but avoid using the power seat until diagnosed to prevent further electrical issues. If the seat is stuck in an unsafe driving position, have it repaired promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.