Milwaukee M12 2407-20 Troubleshooting

On-board LED light continually blinks even after charging battery.

The M12 drill/driver is equipped with a safety feature that prevents the unit from overheating. The sensors are located both on the battery and the battery connectors within the unit. Remove the battery and ensure that these are free of oil and debris, then insert the battery to see if the problem has been resolved.

If the battery is fully charged and inserted but the drill works intermittently or not at all, the battery may be losing connection due to a missing or bent housing connector. See our replacement guide here.

Trigger cannot be pressed all the way and/or drill is unresponsive upon pressing trigger.

The forward/reversing shuttle and the trigger are very close together. The trigger is designed to slide between parts of the forward/reversing shuttle. If your trigger seems jammed, follow our guide here to replace the forward/reversing shuttle.

The speed selector switch is pressed but won't move, or the speed selector switch moves but the speed does not change.

The speed selector lever, located beneath the speed selector switch, tells the unit which speed the user has set the device to. If the speed selector lever becomes bent, broken, or out of place, the switch can get stuck and/or communication to the device can cease. Follow our replacement guide here to replace the speed selector lever.

The forward/reversing shuttle is pressed but won't move, or the forward/reversing shuttle is pressed but direction of keyless chuck does not change.

The spring plate allows the forward/reversing shuttle to retract. If the spring plate is out of place or bent, the forward/reversing shuttle may not function properly. Follow this replacement guide to replace the spring plate.

Drill bit is stuck in the chuck and cannot be removed.

There are a few different potential fixes for a stuck drill bit. First make sure the drill bit has been lubricated properly. A chuck that is not regularly oiled can cause drill bits to get stuck. Try soaking the head in WD-40 to loosen the bit.

If the above action does not work, the jaws may need to be loosened from the inside. Hit the drill bit into the chuck, gently enough to not break the bit. This helps release the jaws inwards. If you are still unable to release the bit, proceed to the next step. Using your hand (protected with a glove) or a strap wrench, run the drill in reverse until the bit comes loose.

If the bit is still stuck the chuck may need to be replaced.

Transmission slips on one or both speeds.

If the transmission slips on any of the speed settings, it is possible the gear case assembly is damaged and needs to be replaced. Check out our replacement guide here for detailed directions on how to do this.