Neutral light was blinking on dashboard cluster panel, scan and P2721 code?

Tiny
HSNDSOME
  • MEMBER
  • 2019 HONDA CITY
  • 90 MILES
Neutral light was blinking on dashboard cluster panel, scan an p2721 code came up which is solenoid D issue on the transmission. Replaced completely new original Honda valve body, Neutral switch, valve body wire harness, filters and oil. After such Neutral light still blinking and code not clearing and also TCM not resetting. To note car running great all gear engaging properly no issues. Any help will be appreciated.
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Monday, September 30th, 2024 AT 4:02 PM

17 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,138 POSTS
So, this is a circuit error which can mean there is a connection issue, or the transmission pressure pump had gone out which affects the circuit.

The P2721 code on your 2019 Honda City refers to a problem with the Pressure Control Solenoid "E" Electrical circuit.

Here is the wiring diagrams so confirm the connection is okay or needs repair.

This guide can help you with the testing:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with. It is a simple one wire connection to the TCM.
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Tuesday, October 1st, 2024 AT 12:21 PM
Tiny
HSNDSOME
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Thanks, I will upload the wiring diagrams and will check through. Will keep you all updated.
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Tuesday, October 1st, 2024 AT 6:41 PM
Tiny
HSNDSOME
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Could you send me a photo of the transmission pressure pump?
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Tuesday, October 1st, 2024 AT 7:01 PM
Tiny
KEN L
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  • 54,138 POSTS
Sure, here is how to replace the fluid pressure pump. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Wednesday, October 2nd, 2024 AT 9:45 AM
Tiny
HSNDSOME
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Thanks
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Wednesday, October 2nd, 2024 AT 4:48 PM
Tiny
HSNDSOME
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  • 37 POSTS
I went through the harness and oil pressure switch all seems to be okay. Any other ideas. I'm thinking may be an issue with the TCM.
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Thursday, October 3rd, 2024 AT 9:36 AM
Tiny
KEN L
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  • 54,138 POSTS
Yes, it can be the TCM that is having an issue since you have checked anything else. Here is the location and how to change out the TCM. Check out the images (below). Let us know what you find.
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Thursday, October 3rd, 2024 AT 9:58 AM
Tiny
HSNDSOME
  • MEMBER
  • 37 POSTS
Do you all have the wiring diagram for the 7 wires transmission jack to the valve body, and wires pacific voltage
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Wednesday, November 5th, 2025 AT 4:41 PM
Tiny
KEN L
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I do but the site is having issues, can you upload an image of the connector so I get the right ones to you?
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Thursday, November 6th, 2025 AT 8:55 AM
Tiny
HSNDSOME
  • MEMBER
  • 37 POSTS
7 wires jack that Jack's into the valve body front of jack
Light green
Light grey
Light brown

Back of jack
Dark green
Red
Dark Grey
Pink

Looking for the wiring diagram+ pinouts an voltage specs of each wires.
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Thursday, November 6th, 2025 AT 9:06 AM
Tiny
HSNDSOME
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Below is photo provided
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Thursday, November 6th, 2025 AT 9:08 AM
Tiny
KEN L
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Sorry it looks like the site is having an issue, I will contact the owner and let them know. I cant see the images. So I will need to get back to you.
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Sunday, November 9th, 2025 AT 9:57 AM
Tiny
HSNDSOME
  • MEMBER
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Ok looking forward for your response.
Which site do you use to get the wiring diagram an pinouts for this said car.
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Sunday, November 9th, 2025 AT 10:10 AM
Tiny
KEN L
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Yep, this is what we use for wiring diagrams

https://my.alldata.com/

They are a good resource.
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Sunday, November 9th, 2025 AT 10:11 AM
Tiny
HSNDSOME
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  • 37 POSTS
Ok Alldata has for honda city cng gm6 version?
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Sunday, November 9th, 2025 AT 10:12 AM
Tiny
KEN L
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Yep, it is the same as a Honda Civic.
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Monday, November 10th, 2025 AT 8:55 AM
Tiny
HSNDSOME
  • MEMBER
  • 37 POSTS
On the 7 wire jack to the valve body could you let me know which color supposed to be the 12v feed wire, with key on no wires showing 12v. Or does it carry a 12v or not.
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Thursday, December 4th, 2025 AT 4:57 PM

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