Engine derated?

Tiny
DAVENPORT
  • MEMBER
  • 2019 CHEVROLET EQUINOX
  • 1.5L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 48,000 MILES
Great little car. Zero problems until now. Loaned car to granddaughter. Came back derated. Codes said wheel sensors - replaced. Then Pedal sensor - replaced twice. Then throttle body - replaced. Then still would not communicate with the ECM - replaced. Still doesn’t communicate. Please help!
Tuesday, July 8th, 2025 AT 4:04 PM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 53,442 POSTS
The ECM will not communicate if you have a fuse out. I would check the ECM and ECM? TCM fuses under the hood and the fuse #6 in the battery fuse panel near the battery (250amp). This guide can show you how:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Also, check the "DLC left" fuse in the fuse panel on the left side of the dash. You might want to go over this video as well:

https://www.youtube.com/watch?v=6Tlg3JmgNSQ

Please go over these guides and get back to us.
Was this
answer
helpful?
Yes
No
+1
Wednesday, July 9th, 2025 AT 6:38 PM
Tiny
DAVENPORT
  • MEMBER
  • 4 POSTS
Thank you, Ken L. We will check the fuses as you have directed and report back. Appreciate your help immensely!
Was this
answer
helpful?
Yes
No
Thursday, July 10th, 2025 AT 12:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 53,442 POSTS
Sounds good :) have a good day!
Was this
answer
helpful?
Yes
No
+1
Thursday, July 10th, 2025 AT 9:46 AM
Tiny
DAVENPORT
  • MEMBER
  • 4 POSTS
The problem was the electrical harness between the pedal sensor and the ECM. To find it required 2 pedal sensors, throttle body, ECM, and then the harness. I appreciate your reply, as it put the person diagnosing the problem onto the sleuthing it took to discover what was wrong. This was a very difficult repair to find. One wire in miles of electronics. The repair recommended sequence did not point to the harness - this was a rare problem.
Was this
answer
helpful?
Yes
No
Thursday, August 14th, 2025 AT 9:14 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 53,442 POSTS
Yep, they happen, nice work finding the problem and getting back to us. Please use 2CarPros anytime we are here to help.
Was this
answer
helpful?
Yes
No
Friday, August 15th, 2025 AT 12:13 PM

Please login or register to post a reply.

Related Throttle Body Content

Throttle Body Service
GUIDE
Throttle Body Service
The throt­tle body or throt­tle ac­tu­a­tor as they are called on newer cars is used to me­ter the en­gine air in­take thus con­trol­ling the en­gine RPM and power out­put via the gas...
VIEW MORE