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I’m working on a 2011 Chevy impala V6 on my car doesn’t

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indicate what gear it’s in...
I’m working on a 2011 Chevy impala V6 on my car doesn’t indicate what gear it’s in. I’ve change the control module transmission control module, the body control module and still no luck. I also change the instrument cluster just a test to see if there’s a difference but still nothing
Submitted: 4 months ago.Category: Chevy
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Answered in 3 hours by:
1/16/2018
Chevy Mechanic: BOBBYSS, Master Technician replied 4 months ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,580
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
Verified

Hello my name is***** you tell me if the vehicle is still starting and running fine?

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Customer reply replied 4 months ago
Start and run good. Took it to the shop yesterday to get crank sensor relearn because I change the BCM and the shop wasn’t able to do it because he keep getting a message “the car need to be in Park or Neutral before the sensor can clear” so from that it’s telling me the ECM computer not seeing tranni signal although I’m able to drive the car.
Chevy Mechanic: BOBBYSS, Master Technician replied 4 months ago

Does the shift indication come up on the dash and it is incorrect or does it not come up at all?

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Customer reply replied 4 months ago
It does not and that’s the problem I’m facing
Chevy Mechanic: BOBBYSS, Master Technician replied 4 months ago
Sorry for all of the questions but one last one. Was this occurring before the BCM was replaced and is this a new BCM.
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Customer reply replied 4 months ago
the problem was There before changing the BCM and that’s reason why I changed it and yes the new BCM
Customer reply replied 4 months ago
Any update?
Customer reply replied 4 months ago
Hi, I’m checking to see what’s the next step? I haven’t heard nothing 7 last night and trying to get this problem resolved.
Chevy Mechanic: BOBBYSS, Master Technician replied 4 months ago

You need to start by making sure there is power to the ECM/TCM and TRANS fuses under the hood. Then you need to make sure that the ground for transmission position above the starter is fine. if it all is good then you will need to check the signal from the position sensor in the module. I am also assuming that when you say module you changed the control module inside of the transmission or just the one on the outside?

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Customer reply replied 4 months ago
Which fuse would this be?
Chevy Mechanic: BOBBYSS, Master Technician replied 4 months ago

They are listed with those acronyms in the fuse box under the hood. The fuse box lid will tell you their location.

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,246
Experience: Have owned a repair shop for 25 yrs.
Verified

Hi, My name is ***** ***** for the delay.

I will do my best to assist you

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

does it run and shift ok?

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Customer reply replied 4 months ago
it does
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

ok..

the only problem is the PRND321 isnt lighting up?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

or,,does it light up but show it being in P all the time?

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Customer reply replied 4 months ago
That is correct. I change the BCM in the car and it triggered the Crank sensor relearned so I took it to the shop to get it cleared and they wasn’t able to do it because the system doesn’t see the car to be in park or neutral so something not communicating I’m not sure what it is .
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

i have seen this happen a few times on other gm cars and trucks..

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

and the problem was the ignition switch,,not the lock cylender ,,but the switch itself

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

Parts InformationOEM PartPrice

Ignition Switch

Ignition Switch-part#25757645...$29.58

Labor InformationSkill LevelMfg. WarrantyStandard

Replace

Ignition Switch, R&R B-0.7-0.9 hours labor

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Customer reply replied 4 months ago
Would this need to be program?
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

no..but you may need to do a relearn proceedure

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Customer reply replied 4 months ago
I can run to the junk yard and get one.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

it cost less than $30..you may just want to get a new one from your parts store

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

if for some reason it isnt the switch,,i would then think it is the instrument cluster itself

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

If you are satisfied with my answer, Please Rate my answer by clicking the rating button so I can get credit for my work. I’m not always going to be giving you good news, so please don't let this stand in the way of you accepting my answer. .it does not cost you more money and we will still be able to communicate, ,.please understand, i can not see, hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated.. if you are not satisfied with my answer, please do not leave bad feedback ,i will gladly opt out and let another expert handle the question. .if i have sent any diagrams, please print them. .sometimes you may need to right click the image [,then save picture as]to save it to your computer so you can open it with your picture program...Please ask if you need more help.

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

blob:https://my.alldata.com/11f95487-c976-4268-87dd-decc6a54c618

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Customer reply replied 4 months ago
I already tried the instrument cluster and it didn’t do anything still the same message
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

ok,,i would think you need a ignition switch

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Customer reply replied 4 months ago
I am on my way to go pick up the parts right now so I will let you know what happened after install
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

please do

thanks

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Customer reply replied 4 months ago
I installed the switch last night but it’s in the same result
Chevy Mechanic: Tim's Auto Repair, mechanic replied 4 months ago

please stand by. Perhaps one of the other guys has a better idea of what is going on here.

someone will be right with you.

thanks

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Customer reply replied 4 months ago
Ok
Chevy Mechanic: Todd Audette, Chevy Technician replied 4 months ago
Todd Audette
Todd Audette, Chevy Technician
Category: Chevy
Satisfied Customers: 427
Experience: Chevrolet Technician
Verified

New tech here...My name is ***** ***** see what I can come up with and get back to you

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Customer reply replied 4 months ago
Ok please
Chevy Mechanic: Todd Audette, Chevy Technician replied 4 months ago

I see you said you have replaced the transmission control module...was this a new or used part

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Customer reply replied 4 months ago
New part I bought. Would this need to be program?
Chevy Mechanic: Todd Audette, Chevy Technician replied 4 months ago

Absolutely needs to be programmed. The trans module receives input from the internal mode switch inside of the transmission then sends a message via data to the cluster. You are going to have to get it programmed

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