Some owners may notice the headlights in their 2024 Chevrolet Silverado HD and 2024 GMC Sierra HD pickups may flash every 6-8 seconds. The windshield wipers may also pause at the same time.  Thankfully, the root cause and fix are relatively easy and documented in Technical Service Bulletin 24-NA-005.

The Issue- TSB 24-NA-005

Some customers may comment on the headlamps flashing and/or the windshield wiper pausing while wiping.
Technicians may find DTC P0606 in the Lighting Control Module set current or in recent history.

Vehicles Affected – TSB 24-NA-005

  • 2024 Chevrolet Silverado HD (2500HD & 3500HD)
  • 2024 GMC Sierra HD (2500HD & 3500HD)

The Cause / Fix – HD Flashing Headlights

The root cause of this problem is low battery voltage. According to the TSB:
The causes of the condition may be that a low battery state of charge can cause voltage diagnostics to fail in the Lighting Control Module.
If the battery goes below the threshold in the Lighting Control Module during a cranking event or battery discharged that needs a jump start, the Lighting Control Module may go into a reset every 8-10 seconds, causing the headlamps to flash.

According to GM-Techlink:

The Body Control Module (BCM) communicates with the Lighting Control Module over CAN to request headlamp illumination and wiper operation.

If the vehicle’s battery goes below the threshold in the Lighting Control Module during a cranking event or the battery is discharged and needs a jump start, the Lighting Control Module may go into a reset every 8-10 seconds, causing the headlamps to flash.

If the headlamps are flashing, do not replace the Lighting Control Module. (Fig. 4) Test the battery following the recommended testing procedures in the appropriate Service Information and replace the battery if necessary.

To correct the flashing headlamps and clear DTC P0606, disconnect the battery, which will reset the Lighting Control Module.

The headlight control module in the 2024 Silverado and Sierra HD that will cause headlight flashing when the battery voltage gets too low.
The headlight control module in the 2024 Silverado and Sierra HD that will cause headlight flashing when the battery voltage gets too low.

Dealerships will test the battery/batteries and replace failing units. A simple charge and battery disconnect should solve the issue as long as the battery is good.

Documents For Download – TSB 24-NA-005

You can download the documents for this TSB: HERE