Canon Error 5012 — What It Means & How to Fix It
Updated August 2026 · Independent PrinterCare USA support guide
Canon error 5012 is one of the more serious hardware errors you can encounter, and it stops your scanner from working entirely. This error specifically tells you that the printer's control board is unable to communicate with or detect movement from the scanner motor mechanism, which means your flatbed scanner and automatic document feeder will both be disabled until you resolve it.
The good news is that many users fix this themselves through basic troubleshooting steps before needing parts replacement. We will walk you through every legitimate fix from easiest to most involved, so you can get your scanner back online without unnecessary downtime.
How to fix it — step by step
- Perform a complete power cycle. Turn off your Canon printer using the power button on the front panel, then unplug the power cable from the back of the device. Wait a full thirty seconds to allow all capacitors in the circuit board to discharge completely. Plug the power cable back in, power on the printer, and attempt a test scan from your computer to see if the error clears.
- Check for physical obstructions in the scanner. Open the scanner cover or automatic document feeder access panel and visually inspect the glass bed and scanning rails for any dust, paper fragments, or foreign objects. Use a soft, dry, lint-free cloth to gently wipe the glass scanning surface and the rails where the scanner head moves back and forth. Do not use liquid cleaners on the glass or internal parts.
- Verify the scanner cable connection. Power off the printer and locate the internal cable that connects the scanner motor assembly to the main control board, which is typically a white or gray ribbon cable near the scanner mechanism. Gently disconnect this cable by pressing the small release tab on each end and then firmly reconnect it, ensuring it seats completely in both connectors. Power the printer back on and test again.
- Clear the printer's error log and reset the scanner. On your Canon printer, navigate to the settings or maintenance menu using the physical buttons or touchscreen, then select the option to clear all errors or reset the scanner unit. The exact menu path varies by model, but you are looking for options labeled reset, clear error, or service mode. Allow the printer to complete the reset process, which may take thirty seconds to two minutes.
- Update or reinstall printer drivers on your computer. Visit the official Canon support website and download the latest printer driver for your exact model number and your operating system, whether Windows 11 or macOS. Uninstall the current printer driver through your system settings, then restart your computer and install the new driver package from Canon. Restart again after installation and attempt to run a scan from the Canon utilities or your scanning software.
- Test the scanner motor with diagnostic mode. Access your printer's service or diagnostics menu by holding down specific button combinations during startup, which varies by Canon model but often involves holding the stop and power buttons simultaneously for several seconds. Look for an option to run motor tests or hardware diagnostics, which will attempt to cycle the scanner motor through its full range of motion. Note any specific error codes or messages that appear during this diagnostic test.
- Inspect and reseat the scanner motor connector. Power off and unplug the printer, then access the scanner motor assembly by removing the appropriate panel or cover according to your model's service manual. Locate the motor connector, which is typically a small plastic plug with multiple pins, and carefully disconnect it by gently pulling straight out. Inspect both the connector and the port for any bent pins, corrosion, or debris, then firmly reseat the connector until you feel or hear a click.
- Contact a technician for hardware replacement assessment. If none of the above steps resolve the error, the scanner motor assembly itself may have failed and require replacement, which is not a user-serviceable repair on most Canon models. You can schedule a remote diagnostic call with a qualified printer technician for forty-nine dollars, which will determine whether your scanner needs replacement or if your device can be repaired more cost-effectively. Many users find that the remote diagnostic fee applies toward the repair if you proceed with service.
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Frequently asked questions
Does error 5012 mean my scanner is completely broken and unfixable?
Not necessarily. While error 5012 does indicate a motor communication problem, many cases are resolved through driver updates, cable reseating, or a simple power cycle. Only if diagnostics confirm that the motor itself is not responding to electrical signals does the hardware actually need replacement, which is why testing is important before assuming the worst.
Can I use the printer for regular printing while error 5012 is present?
Error 5012 specifically affects only the scanner function, so your printer should continue to work normally for document printing from your computer. However, some Canon models may disable the entire multifunction unit until the error is cleared for safety reasons, so attempt a test print to verify. If your model does restrict all functions, focus on the troubleshooting steps above to restore full functionality.
Will disconnecting and reconnecting the scanner cable cause any permanent damage?
No, disconnecting and reconnecting the scanner motor cable is a standard troubleshooting procedure and will not cause permanent damage when done carefully. Always ensure the printer is powered off and unplugged before touching internal cables, and press the cable connectors straight in without twisting or forcing them. If you see bent pins or damaged connectors, stop and contact a technician rather than forcing the connection.
How much does it cost to replace the scanner motor assembly if it has failed?
Scanner motor replacement costs vary significantly based on your specific Canon model, typically ranging from one hundred fifty dollars to four hundred fifty dollars for the part plus labor if you use a service center. Before investing in replacement, use the forty-nine dollar remote diagnostic service to confirm that the motor has actually failed and that no simpler fix is available. Knowing the exact failure mode will help you decide whether repair is worthwhile compared to purchasing a new device.