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Check transmission light on and cannot change gear it only stuck on fifth? Error code p1c9d?

Tiny
ÃHMèD ÅL-HüSSINI
  • MEMBER
  • 2017 JEEP LIBERTY RENEGADE
  • 1.4L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
Sometimes I travel a long way after parking and turn on again to back home check transmission light on and cannot change gear it only stuck on 5th. I'm back home with check transmission light on and parked it for one day then try to turn on it again its work normally and no error no check transmission. So, what happened?
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Friday, July 15th, 2022 AT 7:04 AM

38 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,468 POSTS
It sounds like the TCM is going out or the input shaft speed sensor is not working correctly. For this problem you can get a CAN scanner from Amazon for about $30.00 here is a video to show you how. This can tell more of what's going on than a regular code reader.

https://youtu.be/u-4syLc-ifQ

Here is a scanner link:

https://amzn.to/3o41KcZ

Here are the instructions on how to replace the TCM and input shaft speed sensor in case this is what comes up in the diagrams below. Also, I have included the transmission wiring diagrams so you can see how the system works. Also, because the TCM is mounted with the electrical connector pointing upwards I have seen water get into the connector causing corrosion which can cause all kinds of issues. Remove the connector to check.

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Friday, July 15th, 2022 AT 6:03 PM
Tiny
ÃHMèD ÅL-HüSSINI
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Can I contact you on whatsapp or messenger please?
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Saturday, July 16th, 2022 AT 12:09 AM
Tiny
ÃHMèD ÅL-HüSSINI
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Error code p1c9d.
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Saturday, July 16th, 2022 AT 12:10 AM
Tiny
KEN L
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We like to keep all conversations on the site so others can benefit from it. The code P1C9D is for the Gear Shift Position Sensor which is in the shift lever. Here is the location so you can check out the connections and connector. Check out the diagrams (below). Please let us know what happens.
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Saturday, July 16th, 2022 AT 11:05 AM
Tiny
ÃHMèD ÅL-HüSSINI
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Can you send pics of location in c635 transmission?

This sensor location above transmission or attached to valve body?
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Saturday, July 16th, 2022 AT 4:57 PM
Tiny
KEN L
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The sensor is attached to the gear shifter itself.
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Sunday, July 17th, 2022 AT 10:39 AM
Tiny
ÃHMèD ÅL-HüSSINI
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This one?
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Sunday, July 17th, 2022 AT 5:23 PM
Tiny
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Bro, I tried to drive the car today it work normally and no error.

This car will make me mad.
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Monday, July 18th, 2022 AT 5:47 AM
Tiny
KEN L
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It is hard to say from the picture the part would need to be removed and matched up, also the switch problem could be intermittent or had a dirty contact and will be okay now. Sometime dirt or dust can get down inside switch and cause an intermitted problem.
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Monday, July 18th, 2022 AT 10:19 AM
Tiny
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Okay. So, I have to go to mechanic ask him to clean sensors belong to transmission, right?
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Monday, July 18th, 2022 AT 4:43 PM
Tiny
ÃHMèD ÅL-HüSSINI
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The mechanic told me today he can't replace 2-4 sensor because its sometimes work and 2 times make error I told recheck transmission from inside and clean everything then fill new fluid if an error happened again, we will replace the sensor 2-4 gear shift.

What's your onion?
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Tuesday, July 19th, 2022 AT 4:03 AM
Tiny
KEN L
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Yes, it is working okay run it, if it acts up again lets change the switch out as per the trouble code.
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Tuesday, July 19th, 2022 AT 11:22 AM
Tiny
ÃHMèD ÅL-HüSSINI
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This error happened in March first time then happened for 5 days second time between two times I travelled by the car eight times every time 100-200 KM without error.
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Tuesday, July 19th, 2022 AT 10:06 PM
Tiny
ÃHMèD ÅL-HüSSINI
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Pro I travelled again today 150 km then take rest two hours one the way to back home after 60 km checked transmission soci stopped and disconnected the battery then connect it after 10 minutes but appear a lot of error like hand brake and traction system so I feel its battery issue.
After I arrived at home I re-disconnected and connected the battery. Everything is good and no check transmission!

What is your opinion?
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Wednesday, July 20th, 2022 AT 4:25 PM
Tiny
KEN L
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You are resetting the system when the battery is disconnected so it must be a soft code and a intermittent error. You can try spraying contact cleaner inside the switch to see if that helps.
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Thursday, July 21st, 2022 AT 10:29 AM
Tiny
ÃHMèD ÅL-HüSSINI
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Which switch do you mean?
I measured the battery and alternator all is okay today.
Can I clean the wiring harness of valve body by electric cleaner?
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Friday, July 22nd, 2022 AT 5:32 AM
Tiny
ÃHMèD ÅL-HüSSINI
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Three mechanics opinions were to replace the valve body (hydraulic shift actuator), but I can't because it cost more than $2,000.00 and I can't spend this money on the car to repair and maybe it get new errors again.
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Friday, July 22nd, 2022 AT 5:54 AM
Tiny
KEN L
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In the switch near the gear shift lever not the valve body. Check out the diagrams in the post above.
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Friday, July 22nd, 2022 AT 5:48 PM
Tiny
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Update: mechanic told me its 2-4 gear sensor position so I need full hydraulic shift actuator or replace the valve body conductor plate.

Full hydraulic shift was so expensive $2,100.00.

Can you tell me how can I get a new conductor plate? From where can I buy it it's part inside valve.
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Saturday, July 23rd, 2022 AT 6:04 PM
Tiny
KEN L
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I would try Ebay and if not, it will be from the dealer. Here is what the manual says about the conductor plate. Diagrams below.
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Sunday, July 24th, 2022 AT 11:56 AM

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