Code 43

SEAN0308

MEMBER
1993 CHEVROLET SILVERADO
5.7L
V8
4WD
AUTOMATIC
40,000 MILES

Hi, on my truck listed above K1500 I am getting code 43. I am wondering if it is the knocking sensor or the wiring. Any suggestions? The check engine light stays on.

Monday, March 28th, 2022 AT 2:38 AM

6 Replies

JACOBANDNICKOLAS

MECHANIC
108,264 POSTS

Hi,

As far as the code is concerned, yes it deals with the knock sensor. I started looking up diagnostics for you but was stopped. I need to know the transmission model in the truck. One is an electric shift 4L60E and the other isn't electric. They point me in different directions.

Also, let me know if you are experiencing any drivability issues. Do you ever notice ticking or valve ping? Is there a loss of power?

If you aren't sure about the transmission, see pic 1 below and let me know what you find.

Take care,

Joe

See pic below.

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Monday, March 28th, 2022 AT 7:23 PM

SEAN0308

MEMBER
21 POSTS

I believe it is the 4L60E transmission. I crawled under it the connector was disconnected from knock sensor. I reattached it yesterday and the code went away, and the knock sound went away. I hit a bump today and the light came back on. I guess the question now is should I replace the connector or the knock sensor. Thanks.

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Wednesday, May 4th, 2022 AT 7:06 AM

SEAN0308

MEMBER
21 POSTS

I believe it is the 4L60E transmission. I crawled under it the connector was disconnected from knock sensor. I reattached it yesterday and the code went away and the knock sound went away. I hit a bump today and light came back on. I guess the question now is should I replace the connector or the knock sensor. Thanks.

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Wednesday, May 4th, 2022 AT 7:06 AM

JACOBANDNICKOLAS

MECHANIC
108,264 POSTS

Hi,

There should be clips that hold the connector on to the sensor. Are you able to see if they are broken or damaged?

Let me know.

Joe

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Wednesday, May 4th, 2022 AT 2:55 PM

SEAN0308

MEMBER
21 POSTS

It didn’t look damaged or broken. But the pin inside the connector looked bent. Got a feeling when my mechanic replaced the starter, they either didn’t connect it right or had pulled it off and didn’t I clip it. The tab on the connector was still closed when I found it not hooked up. I got the code a few days after the starter was replaced. I didn’t have time to look at it and thought the sensor went bad.