check engine lights

2001 JEEP GRAND CHEROKEE
165,000 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
Avatar
BROTHER BUZZ
  • MEMBER
  • 32 POSTS
after driving ten to fifteen miles on the freeway the check engine light comes on steady. I get where i am going/turn engine off plug in my scanner I get no DTC's mil light is off. I start it back up no light on, this is the third time its happen. used two different scanners and the same thing. my heater core broke two weeks ago. So I loop the hose around to bypass heater unit. the vehicle has been running like new since you guys and Steve W. helped me a few months back. what can I do guys?
Sep 7, 2017 at 2:52 PM
Advertisement
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,390 POSTS
Plug the scan tool in and see if it catches the fault as you drive, some can record and you hit a button when the light is on to catch the data. Plus on most you can plug them in with the engine running and if there is a code it may show up then.
Or have someone else drive while you watch the live data and see what changes when the light comes on.

But it is possible it is a manufacturer specific code or in the ABS or transmission and your scan tool will not read it because it is not stored in the proper format.
Sep 7, 2017 at 6:31 PM
Avatar
BROTHER BUZZ
  • MEMBER
  • 32 POSTS
I just got back home, & back to my computer, thanks steve for your help again & again, i'll get on it today and i'll let you know the outcome...................thanks brother buzz
Sep 12, 2017 at 11:46 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,628 POSTS
Steve is one of our best!

Please let us know what happens so it will help others.

Cheers, Ken
Sep 14, 2017 at 3:54 AM
Avatar
BROTHER BUZZ
  • MEMBER
  • 32 POSTS
your right ken, he is the best,he helped me on my jeep before and stuck with me with 23 step by step answers, and this one to which turned out to be a evap leak that was below the purge solenoid valve thanks again steve for all your help..and to ken and 2carpros.com
Dec 16, 2017 at 9:39 PM
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,390 POSTS
EVAP codes are such fun...... I got fed up with the rusting lines under the wife's Liberty and replaced all the runs for fuel and EVAP with plastic. Then did the brake lines with NiCopp.
Then last weekend I solved the entire issue and bought her a new car!!!
Dec 17, 2017 at 6:54 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle