Can I fix HP Error 54 myself?

Needs servicing. If the message persists, HP says to contact HP support.

HP Error 54: Internal sensor error

Also shows as: 54.XX Error, Turn off then on

🧑‍🔧 Needs servicing

The printer has had an error with one of its internal sensors.

Turn the printer off, wait at least 30 seconds, then turn it on and let it initialize.
If you use a surge protector, remove it and plug the printer directly into the wall outlet.
Turn the printer on again and check whether the message clears.

If the message persists, HP says to contact HP support.

HP documents this code for models including HP LaserJet Pro 400 M401, HP LaserJet Pro M701/M706.

Write down the exact code before you do anything else — similar-looking codes often mean completely different things.
Power the printer off, unplug it for a couple of minutes, then power it back on. A surprising number of transient errors clear here.
Open the covers and check for paper scraps, packaging material, or anything blocking the carriage.
Check the cartridges or tanks are genuine, correctly seated, and not empty.
Confirm the printer is plugged directly into a wall outlet, not a power strip or extension lead.
Check your model’s own manual — codes are model-specific, and the manual is the authority for your machine.

Source: HP Customer Support - HP LaserJet Pro 400 Printer M401, Interpret Control Panel Messages. Codes are model-specific, so your own model's manual is the final word. Reviewed October 2026.

Tell our printer technician your model and what you've tried. You'll find out whether it's fixable at home or worth repairing at all.

Eric Paul Amora · Printer & Hardware Repair Technician