Statistics How To

TI-89 Error Codes

Probability and Statistics Index > TI-89 for Statistics Topic Index > TI-89 Error Codes

ti-89 error codes
The TI-89 can be a frustrating gadget. Even if you follow the steps in the TI-89 articles perfectly, you may get an unexpected TI-89 error code, like “Undefined Variable.” Usually, you’ve typed something in wrong or there’s a setting somewhere on the calculator that’s preventing it from performing whatever function you want it to perform. This is a list of the most common codes you are likely to encounter.

Common TI-89 Error Codes

Problem: “Undefined Variable” error. Solution: Double check your inputs any look for typos. If that doesn’t work, reset the variable memory. Press
2nd 6 f1 ENTER. Select “2:Default” and then press ENTER twice.

Problem: “Syntax Error”. Solution: Check you have included parentheses “(” “)” to open and close your arguments.

Problem: “Argument Error”. Solution: If you get this error when trying to enter a function from the graphing list in the home screen entry line, make sure you are referring to the function by the correct number and that you have a function entered in the right place in the y=editor.

Problem: TI89 will not graph, or graphs too many functions. Solution: Check the y=editor to make sure only the functions you want to graph are turned on (look for check marks to the left). To remove (or add) a check mark, scroll to the space the the left of the “y=” and then press the f4 key next to any function you want to graph (or not to graph).

Error not listed here? Check Appendix B of the 8992bookengfor more TI-89 Error codes.


If you prefer an online interactive environment to learn R and statistics, this free R Tutorial by Datacamp is a great way to get started. If you're are somewhat comfortable with R and are interested in going deeper into Statistics, try this Statistics with R track.

Comments are now closed for this post. Need help or want to post a correction? Please post a comment on our Facebook page and I'll do my best to help!
TI-89 Error Codes was last modified: October 12th, 2017 by Stephanie

One thought on “TI-89 Error Codes

  1. Andale Post author

    This could be a few different things. Have you reset your variable memory?
    • Press [2nd] [6] (MEM) [F1] [ENTER]
    • Select 2:Default
    • Press [ENTER] and Defaults Set is displayed
    • Press [ENTER]
    If that doesn’t work, are you using the multiplication symbol on your y=? Have you tried going to home, F6 and clean “clear a – z”?