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2009 Jeep Grand Cherokee Question: Check engine light, ETC warning light come on; temp gauge drops to 0; why?

 

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Mitchkeos, 4.7L V8, Yuma, AZ, December 31, 2013, 05:44
 Rookie

Problem seems to cycle - driving along, suddenly the check engine light comes on along with the electronic throttle control warning light, as the temp gauge drops to zero - which triggers the Check Gauges warning light to come on. Drive more, stop a few times, ETC light goes off, temp gauge starts working again. Check engine light stays on for a while, then goes off. Some miles/hours later, cycle repeats. No indication of trouble in engine behavior, sound, etc. Tried replacing gas cap (2x). Dealer replaced thermostat. Still going on. Any ideas?

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  • Answer #1

    Greg's Orange Auto (12205 Answers) , Orange, CA - (714) 361-9386
    globalhelper December 31, 2013, 06:18
     Master

    have codes scanned and post so we can adv

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  • Answer #2

    goodguy December 31, 2013, 06:44
     Master

    could be a cts problem [coolant temp sensor] I agree with #1 check to see if there are any codes

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    Mitchkeos, December 31, 2013, 09:45
     Rookie

    When dealer last had it for this same problem (9/13/13), they wrote "Engine light on - found faults for cooling system performance," then "checked for coolant leaks found leaking t-stat, replaced, flashed PCM to latest software for throttle body updates." But the whole cycle began again within a few days of this service. Currently vehicle is at dealer - but all warning lights were off this time, service advisor said, if the lights aren't on there won't be any codes. I asked, you mean it doesn't store codes? He replied, maybe.

    I cannot link the recurrence of this to any pattern in terms of speed, braking, etc. I understand possible link to CTS but don't see how that would also relate to ETC warning - they always come together, and go away together. Sound like software to me. I will post any further info as I get it.

    Just heard back from dealer - SA claims, no engine light, no code. Next time it happens I will take it somewhere to read the codes while the situation is active.

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