If your 401(k) plan appears to be treading water, or worse, it's up to you to tackle the situation head on and fix the problems and build the assets you'll need in retirement,.

Given the complex nature of investing and the nuances of a company retirement plan, it's not always entirely clear what needs to be addressed when 401(k) assets seem to be stuck in neutral. By and large, it's the following red flags that signal your 401(k) needs a tune-up, and in more rare cases an overhaul, so you get back on track to a comfortable retirement.

Here's a look:

If you liked this article you might like

Dividend Funds Need to Be in Your Life

Unlock the Secrets Behind Bitcoin Investing

Questions You Must Ask a Car Salesperson to Avoid Getting Ripped Off Big-Time

5 Surefire Ways to Destroy Your Marriage

Best States for Retirement in the U.S.