You're in the middle of a print job and your HP LaserJet freezes. The screen shows 49.4C02 Error. The printer stops completely. This guide tells you exactly what it means and how to fix it fast.

What Does HP Error 49.4C02 Mean?

Error 49.4C02 is a firmware or communication error. It happens when the printer receives a corrupted print job or encounters a firmware conflict. It does not mean your printer is broken.

In most cases the fix takes less than 5 minutes and costs nothing.

Step 1 — Power Cycle the Printer

This fixes the error in about 60% of cases.

Turn the printer completely off using the power button. Wait 60 seconds. Do not just restart — wait the full 60 seconds. Then power it back on and try printing again.

If the error is gone, you are done. If it comes back, move to Step 2.

Step 2 — Clear the Print Queue

A corrupted print job sitting in the queue causes this error repeatedly. You need to clear it completely.

On your PC, go to Control Panel → Devices and Printers. Right-click your HP printer and select See what's printing. Cancel all documents in the queue. Then power cycle the printer again.

Step 3 — Disconnect and Reconnect

If you are printing over a network, the issue may be in the connection. Disconnect the network cable or turn off WiFi on the printer. Wait 30 seconds. Reconnect and try again.

For USB connections — unplug the cable from both the printer and the PC. Wait 30 seconds. Reconnect.

Step 4 — Update the Firmware

Outdated firmware is a common cause of the 49.4C02 error. HP regularly releases firmware updates that fix known communication errors.

Go to hp.com/support. Enter your printer model. Download and install the latest firmware. This permanently fixes the error in most cases.

Step 5 — Isolate the Problem Document

Some PDF files and complex graphics cause this error on specific printers. To test this, try printing a simple Word document or a test page from the printer menu.

If the test page prints fine, the problem is with the original document. Try printing it from a different application or convert it to a different format.

Step 6 — Check Your Toner Cartridge

A faulty or incompatible toner cartridge can trigger firmware errors. Remove the toner cartridge and reinstall it firmly. If you are using a compatible or refilled cartridge, try a genuine HP cartridge instead.

Compatible cartridges sometimes cause communication errors that genuine cartridges do not.

Which HP Printers Get This Error?

Error 49.4C02 appears most commonly on these models:

HP LaserJet Pro M404dn, M404dw, M428fdw, M428fdn, M479fdw, M479fdn, HP LaserJet Enterprise M507, M528, and older HP LaserJet 4000, 4050, 4100 series.

When to Call a Technician

If you have completed all 6 steps and the error keeps returning, the formatter board may need replacement. This is a hardware issue and requires a technician or a new printer.

Before spending money on repairs, compare the repair cost against a new printer. HP LaserJet Pro M404dn starts at around $289 and is one of the most reliable printers for small business.

Need a Replacement Toner?

If your toner cartridge is causing the error, a genuine HP replacement fixes it immediately. The HP 59A and HP 59X toner cartridges are compatible with most LaserJet Pro M400 series printers.

Buy genuine HP toner cartridges with fast delivery at kimstardigimart.com.