POLARIS MISFIRE CODES

POLARIS MISFIRE CODES

Dear Sarge,

I have a 2018 Polaris RZR900 and I have been fighting the dreaded misfire code 65590 for almost a year now. I followed everything Boss said in the August, 2020 issue and had my dealer replace any worn clutch parts, a new belt and spark plugs. I still get the misfire code that puts me in Limp Mode. Can you direct this frustrated recruit as to what to do next? FYI Sarge, I have added 26x11x14 Terrabite tires, Elka suspension and an Evolution Powersports slip on muffler if that helps.

Carl Jacobson

Wheeling, West Virginia

Boot, even if you do everything right, you can still have POLARIS MISFIRE CODES, including the 65590 code. In this rare case, the old man was correct and you Dealer did everything right, EXCEPT for one thing. The root of your 65590 code lies with the ECU reading the engine timing based on the rear axle speed and the cam position sensor. If your axle speed read against the cam position sensor isn’t what’s expected, you get a misfire code. As you have seen a bad sparkplug can cause it. A glazed belt can cause it. Low fuel pressure can cause it. Misaligned clutches can cause it. A worn clutch can cause it. Even the tread pattern on your Terrabite tires can cause it under the right conditions! And of course, the slip on muffler too! The fix that your dealer didn’t apply is the new updated factory ECU flash that lowers the system’s sensitivity to small discrepancies. Beyond that, you can have Gilomen Innovations re-flash your ECU to lower the system’s sensitivity to near zero to positivity remove those false misfire error codes for good. As a side benefit they claim a 10HP increase, cooler running engine, speed limiters disabled and many other items. See them here: https://gilomeninnovations.com/misfire-code-fix-tune/. Because you waited a year to contact Sarge, maybe you should be “Recycled” too! Laugh Boot! Drop and count off 50 and laugh again Boot! Dismissed!

See UTV Action’s fast facts on the RZR 900 here: FAST FACTS YOU NEED TO KNOW: POLARIS RZR 900 EPS – UTV Action Magazine