Fix HP Error 49.4C02: Critical Firmware Error
critical Severity: critical
If your HP printer is displaying error 49.4C02, do not worry – this is a known issue with a proven fix. This error typically indicates critical firmware error that can usually be resolved without a service call. Follow the steps below to clear this error.
What Causes HP Error 49.4C02?
This error can be triggered by one or more of the following issues:
- Corrupted print job sent to the printer
- Firmware corruption or incompatible firmware version
- Network communication error during data transfer
- Incompatible PCL or PostScript command in print stream
How to Fix HP Error 49.4C02
Follow these steps in order. After each step, check whether the error has cleared before proceeding to the next one.
- Step 1: Turn off the printer and wait 30 seconds before turning it back on
- Step 2: If the error recurs, try printing from a different application or file
- Step 3: Update the printer firmware to the latest version from HP support
- Step 4: Switch from PostScript to PCL driver or vice versa
- Step 5: Clear all jobs from the print queue and restart the Print Spooler
- Step 6: If on a network, bypass the print server and print directly via USB to isolate the issue
Affected HP Printer Models
The following HP printer models are known to display error 49.4C02:
- HP LaserJet Pro M404dn
- HP LaserJet Pro M428fdw
- HP LaserJet Enterprise M607dn
- HP LaserJet Enterprise MFP M635h
Related HP Error Codes
If you are troubleshooting error 49.4C02, these related error codes may also be relevant:
- 50.2 – Fuser Warm-Up Error
- 13.A3 – Paper Jam in Tray 2/3 Area
- 79 – Service Error – Critical
- 59.F0 – Motor Error
- 0x6100004a – Carriage Jam Error
Frequently Asked Questions
What does HP error 49.4C02 mean?
Error 49.4C02 is a critical firmware error indicating the printer received invalid data it cannot process. It is usually triggered by a corrupted print job, a problematic driver, or a firmware bug. Power cycling the printer clears the error in most cases.
Why does error 49.4C02 keep coming back?
Recurring 49.4C02 errors typically point to a specific document or application sending bad data. Try printing different files to identify the problematic document. Updating the printer firmware and driver often resolves persistent occurrences.
Error still not resolved?
If the steps above did not fix the error, the issue may require professional service. Contact the manufacturer support line or visit an authorized service center near you.