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Thermostat issue Code P0128

Tiny
PETE CUNNINGHAM
  • MEMBER
  • 2016 DODGE CARAVAN
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Here is the info I have. Wondering what I need to do to fix this.
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Monday, December 13th, 2021 AT 10:49 AM

6 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The code P0128 can be triggered by a faulty thermostat, low coolant level or other coolant system issues.

What drivability issues are you experiencing? Is it running cooler than it should?

I have attached the troubleshooting steps for code P0128 below. Go through those steps and it can help to figure out the issue.

Please let me know if you have any questions.
Thank you.
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Monday, December 13th, 2021 AT 11:14 AM
Tiny
PETE CUNNINGHAM
  • MEMBER
  • 4 POSTS
Yes, it's running cool.
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Monday, December 13th, 2021 AT 11:33 AM
Tiny
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  • MECHANIC
  • 6,383 POSTS
It could be do to the thermostat opening too soon or just stuck open.
Go through the troubleshooting guide above. Let me know what you find.
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Monday, December 13th, 2021 AT 11:59 AM
Tiny
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  • MECHANIC
  • 6,383 POSTS
I have attached the thermostat replacement procedure below.
Let me know of any questions.
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Monday, December 13th, 2021 AT 7:48 PM
Tiny
PETE CUNNINGHAM
  • MEMBER
  • 4 POSTS
I replaced the thermostat and problem solved. Thank you !
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Thursday, December 16th, 2021 AT 12:19 PM
Tiny
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  • MECHANIC
  • 6,383 POSTS
You are welcome. That is great news.
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Thursday, December 16th, 2021 AT 12:50 PM

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