Canon Printer Error Code 2120: How to Fix It

Q: What does error code 2120 mean on a Canon printer?

Error code 2120 on a Canon printer means the paper width sensor has detected a fault. The sensor is responsible for reading the size and alignment of paper loaded in the tray. When it cannot get an accurate reading — due to a jam, misaligned paper, dust, or a broken sensor — the printer stops and displays this error to prevent a misfeed or paper damage.

Q: Can I fix Canon error 2120 myself without calling a technician?

Yes, in most cases you can fix error 2120 yourself. The most common causes — paper jams, misaligned paper guides, dust on the sensor, or a corrupted driver — are all DIY-friendly fixes. Only if the physical sensor component is broken or the internal wiring is damaged would you typically need a professional repair.

Q: Why does my Canon printer keep showing error 2120 even after I cleared the paper jam?

If the error returns after clearing a jam, there may be a small torn piece of paper still inside the printer, dust or debris on the sensor, or paper guides that are not snug against the paper. Try cleaning the sensor area with compressed air, reloading the paper with the guides firmly set, and performing a power cycle. If the error persists, a factory reset or driver reinstall may resolve any software-side issues.

Q: What type of paper should I use to avoid Canon error 2120?

Always use paper that matches the size and weight specifications listed in your Canon printer's manual. Using paper that is too thick, too thin, damp, curled, or not within the supported size range can confuse the paper width sensor and trigger error 2120. Canon generally recommends plain, dry, uncurled paper within standard weight ranges (typically 17–28 lb or 64–105 g/m² for most inkjet models).

Q: How much does it cost to replace a Canon printer paper width sensor?

The cost to replace a paper width sensor on a Canon printer varies by model. The sensor part itself is generally inexpensive (often under $20–$30 for the component). However, if you take the printer to a Canon-authorized repair center, labor costs can range from $50 to $100 or more. For older or lower-cost printer models, it may be more economical to replace the printer entirely rather than pay for a sensor repair.

Abstract

Canon error code 2120 indicates a paper width sensor fault, meaning your printer cannot correctly detect the size or position of the paper loaded in the tray. This typically happens due to a paper jam, misaligned paper, debris inside the printer, or a malfunctioning paper width sensor. In most cases, the issue can be resolved at home without professional help by cleaning, realigning, or resetting the printer.