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2015 MN7 cannot get into reverse

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Old Sep 6, 2021 | 03:37 PM
  #1  
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Default 2015 MN7 cannot get into reverse

Detailing my coupe today and tried to back it up. No go. Also noticed the check engine light come on. tried pulling forward , stop and restart. Still no reverse.

DMK
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Old Sep 6, 2021 | 04:40 PM
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Push harder to override the reverse lockout on M7. Been covered before.

Try disconnecting the negative battery cable for 20 minutes - might reset.

I had this happen on my 2014 - but no check engine light.

Ron
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Old Sep 6, 2021 | 06:34 PM
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Need to get the code to determine the possible issue.
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Old Sep 7, 2021 | 08:30 AM
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Guys,

Thanks. I researched the threads and saw the issue covered. Got it into reveres by pulling hard. Going to see if there is a fuse for the lockout circuit and pull it. Will also read the check engine code. Car is on my lift now and will check the wires on the lockout solenoid.

Dave K
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Old Sep 8, 2021 | 10:24 AM
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Started car. Trouble light on. Had to force into reverse. Backed the car 20 yds and put into 1st. Moved forward, stopped and it shifted easily into reverse.. Repeated a couple times. Drove car to my nephew's garage to decipher the trouble code. Code P0502 (wheel speed sensor). Cleared code and all is well. Earlier Forum thread reported the same problem. Owner had left rear wheel sensor changed that was shorted causing the reverse lockout sensor to engage. Will monitor this.

Regards,
Dave K.
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Old Sep 10, 2021 | 05:42 PM
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P0502 isn't a wheel speed sensor it is the vehicle speed sensor located on the transmission. One of the failure modes will cause the reverse lockout solenoid to be activated.







Bill
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Old Sep 12, 2021 | 06:32 PM
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Boy this is a great example of just why this forum is so valuable! Thanks to all the knowledgeable people that participate.
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Old Sep 13, 2021 | 01:41 PM
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Originally Posted by Bill Dearborn
P0502 isn't a wheel speed sensor it is the vehicle speed sensor located on the transmission. One of the failure modes will cause the reverse lockout solenoid to be activated.
Make sense... it is trying to keep you from accidentally selecting reverse while at speed.
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