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My car randomly shuts off?

Tiny
ALEX ZAVALA
  • MEMBER
  • 2006 JEEP GRAND CHEROKEE
  • 6.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 122,000 MILES
My car shuts off randomly usually when I put it into reverse mainly when I turn the wheel all the way either direction but only shuts off in reverse when turning the wheel all the way in park it stays on even if I turn the wheel what could it be?
Also, another thing I disconnected the negative on battery and it died so I changed the alternator, and it still shuts off when disconnected the negative terminal.
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Friday, December 30th, 2022 AT 3:34 PM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Yep, you must leave the battery connected because it acts as a voltage absorber, it's not like the old days of removing the battery cable to tell if there is a problem. We should run the codes to see what comes up. You could have a dirty throttle bore or a vacuum leak causing the problems.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/stall-at-idle

Do this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images (below). Please let us know what happens.
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Saturday, December 31st, 2022 AT 11:37 AM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
So, I got an update on that, I tested the fuses to the ignition coils, and they worked but when I tested the 12v on the connector it didn’t work on the ignition coil that was bad. I checked another ignition coil and It worked, then I check the ground on the connector, and it worked on the bad ignition coil and the good one. So, could this mean that the computer/PCM is doing its job just something in the power wire too the connector is bad?
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Saturday, December 31st, 2022 AT 9:05 PM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
I also have a video to show the RPMs and what the truck does.
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Saturday, December 31st, 2022 AT 9:05 PM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
It has a rough idle in park but in reverse it shuts off after a second or two.
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Saturday, December 31st, 2022 AT 9:41 PM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
Also, all the codes that came up I already replaced the crankshaft sensor.
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Saturday, December 31st, 2022 AT 9:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Thanks for the video, it helps but I cannot read the code sheet. Can you please take a clearer picture and upload it for me? It sounds like you may have an IPM going out. Please check for vacuum leaks and service the throttle bore. Let me know.
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Monday, January 2nd, 2023 AT 1:17 PM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
I’m back Sir Ken.

Not sure if that photo helps more should be more clear
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Monday, January 2nd, 2023 AT 4:52 PM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
Photo isn’t really clearing up I can just right the codes.

P0300 multiple cylinder misfire
Random misfire detected

SECONDARY DTCs
P2302-ignition coil 1 secondary circuit
P2305-ignition coil 2 secondary circuit
U0100-lost communication with ECM/PCM
U1402-implausible engine temperature signal received
P0732-gear ratio error in 2nd
P2638-torque management feedback signal performance

C2100 battery voltage low

U140E implausible vehicle configuration data received

C2202 original vin mismatch/missing

C121E brake pressure sensor comparative performance

C107C brake pedal switch 1/2 stuck
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Monday, January 2nd, 2023 AT 5:03 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Wow, that is a bunch of codes alright. I am starting to think the IPM, or front control module is the problem. I would replace the IPM first because this is a well-known problem with these cars. Here is the location and replacement instructions for both in the images below. Please let us know what you find.
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Tuesday, January 3rd, 2023 AT 11:30 AM
Tiny
ALEX ZAVALA
  • MEMBER
  • 8 POSTS
Hey ken,

I’m back. I’m finally getting time again to work on the truck. So, my question is that is they’re anyways I can test if the IPM or front control module is working or is it only a matter of buying a new one and finding out?
Another thing I try to look it up at a parts store like AutoZone but they don’t seem to have it for my specific truck
2006 Jeep grand Cherokee srt8.
It’s the 6.1L v8.
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Wednesday, January 4th, 2023 AT 12:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Yes, they are difficult to test on your own, a rebuilder has the equipment to do so.
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Wednesday, January 4th, 2023 AT 8:07 PM

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