Code U0574 indicates that the vehicle's primary control module has received invalid or implausible data from the lighting driver control module over the communication network. This typically means the lighting module is transmitting corrupted data, not responding correctly, or its messages fail validation checks.
The module's processor, memory, or output drivers may have failed, causing it to send corrupted data frames.
Open, shorted, or high-resistance circuits on the CAN bus lines to the lighting module disrupt data integrity.
Oxidation, fretting, or incomplete seating at the lighting module connector creates intermittent communication errors.
Voltage drops, noisy supply, or poor ground cause the module to reset or transmit invalid data.
Incompatible software versions between the lighting module and the primary control module after a partial update.
Rare; the receiving module's CAN controller or gateway may misinterpret valid frames as invalid.
No. The code points to invalid data from the lighting driver module, not a failure of the primary control module. Replacing the PCM/ECM rarely fixes this code.
Yes. Low system voltage or excessive voltage drop during cranking can cause the lighting module to transmit corrupted data, setting this code.
Exterior lighting may be unreliable or non-functional, which is a safety hazard, especially at night or in low visibility. Repair should be prioritized.
Clearing only removes the stored code; if the underlying communication or hardware fault remains, the code will return once the lighting module transmits again.