Issues become worst after crank sensor change - Jeep Commander Forums: Jeep Commander Forum
Regular Service / Maintenance This section contains discussion about regular service and maintenance (upkeep) of your Jeep Commander

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post #1 of 8 (permalink) Old 05-14-2019, 04:33 AM Thread Starter
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Issues become worst after crank sensor change

Need help please. 2010 commander with a hemi. Threw a cam position code, and then crank position code. Changed both at same time with new OEM mopar sensors. Now it blindly cranks for 15 seconds. Finally fires. Traction control light is on. Immediately throws crank code again. From what I have read...there is no relearn, or anything other than clearing codes, which i have done numerous times. Anyone else experience this? Put old sensors back in and see if it still does it? At a loss

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post #2 of 8 (permalink) Old 05-14-2019, 11:13 PM
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Luckily I have not had to tear into the top end of these yet. 2009 and 2010 Hemis have the VVT. I believe that the cam sensor is after the variable system on the cam. I do know that the VVT is quite sensitive to oil viscosity. Do you have fresh 5-20 in the case? Aside from ECM problems, I would start looking at timing chain tension, cam bearing caps loose or broken. There is always the possibility of damaged wire harness giving erroneous signals from the sensors. Happy hunting.

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post #3 of 8 (permalink) Old 05-15-2019, 12:34 AM
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This will sound crazy but a bad oil pressure sensor can cause error codes with other sensors and not show that it is defective itself. I had this happen to me. A defective oil pressure sensor is powered by the same circuit as the other sensors and can cause voltage fluctuations that appear as errors on other sensors. It may be worth a try to replace the oil pressure sensor.
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post #4 of 8 (permalink) Old 05-15-2019, 06:46 AM
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There is a "Relearn" that is worth a try. Remove the battery + terminal for about 5 minutes and then reconnect, this causes many of the circuits to relearn.

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post #5 of 8 (permalink) Old 05-16-2019, 05:22 PM Thread Starter
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I dont wanna speak too soon, but I think I got it...
I took my cam sensor plug back off and put some di-electric grease in it, and plugged/unplugged it several times to make sure it was in, and truck fired right up...opposed to the 15 seconds of blank cranking.

Then did the same with the crank sensor, and tightened it more. And changed the oil while i had it in the air.

Set it down, cleared the codes, and they didnt come back.

Drove it probably 20 miles, all ok. Sending the wife to work in it tomorrow. Fingers crossed...

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post #6 of 8 (permalink) Old 08-28-2019, 06:12 PM Thread Starter
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20k miles later. still fine on the above issue. in case it helps someone in the future
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post #7 of 8 (permalink) Old 08-28-2019, 06:23 PM
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Thanks for the update!
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post #8 of 8 (permalink) Old 08-28-2019, 11:41 PM
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Quote:
Originally Posted by johnnymac2k6 View Post
I dont wanna speak too soon, but I think I got it...
I took my cam sensor plug back off and put some di-electric grease in it, and plugged/unplugged it several times to make sure it was in, and truck fired right up...opposed to the 15 seconds of blank cranking.

Then did the same with the crank sensor, and tightened it more. And changed the oil while i had it in the air.

Set it down, cleared the codes, and they didnt come back.

Drove it probably 20 miles, all ok. Sending the wife to work in it tomorrow. Fingers crossed...
That's great information, thanks for sharing.


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