Canon Canon imageCLASS LBP246dw 40 ppm Wireless Duplex Mono Laser Printer JAM-DUPLEX Error Fix: Paper Jam in Duplex / Two-Sided Printing Path

Error code JAM-DUPLEX on the Canon Canon imageCLASS LBP246dw 40 ppm Wireless Duplex Mono Laser Printer means: Paper Jam in Duplex / Two-Sided Printing Path. Paper jammed during automatic two-sided (duplex) printing. The duplex mechanism reverses the paper through a secondary path to print the back side. On Canon imageCLASS models, access the duplex area through the rear panel or by removing the duplex unit (if separate). Remove the jammed paper gently. Duplex jams are more likely with heavy paper, paper that has curled from the first pass through the fuser, or paper that has absorbed moisture. Use standard 20 lb (75 gsm) paper for reliable duplex printing. Store paper in a dry location. If duplex jams are frequent, try a different paper brand or select a lighter paper type in the driver settings to reduce the fuser temperature on the first pass, which reduces curl.

The most successful fix is "Replace Duplex Unit or Service Duplex Mechanism" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Duplex Unit or Service Duplex Mechanism") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Flashlight.

DIY cost: $10-$20. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Canon Canon imageCLASS LBP246dw 40 ppm Wireless Duplex Mono Laser Printer has 8 other known error codes, including: COVER-OPEN (Cover Open — Close Printer Cover), FUSER-ERROR (Fuser Error — Fuser Unit Malfunction), JAM-INSIDE (Paper Jam Inside Printer / Near Toner Area), JAM-OUTPUT (Paper Jam in Output / Rear Area), JAM-TRAY (Paper Jam in Paper Tray / Feed Area), and 3 more.

Error code JAM-DUPLEX also appears on 3 other Canon models: Canon imageCLASS LBP632Cdw 22 ppm Wireless Duplex Color Laser Printer, Canon imageCLASS MF269dw II Wireless Duplex Mono Laser All-in-One Printer, Canon imageCLASS MF453dw 40 ppm Wireless Duplex Mono Laser All-in-One Printer. The fix may vary by model, so check each model's specific page for tailored repair steps.