Gm Code 43


Old 03-23-04, 02:24 PM
Thread Starter
Join Date: Apr 2001
Posts: 82
Received 0 Votes on 0 Posts
Gm Code 43

Hi all,
I have a 92 full size cehvy pick up with a 5.7 liter. Throttle Body. The truck recently started running very badly and is throughing a code 43 and 33. Any suggestion on where to start?

Sponsored Links
Old 03-23-04, 03:34 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
Received 0 Votes on 0 Posts
The code 33 is the important one. It indicates MAP sensor voltage too high. This could be a bad sensor but is more likely a broken or leaky vacuum line supplying it. Inspect the line/hose very carefully all the way back to it's source. Look for any other vacuum leaks that could be lowering the vacuum overall.

The code 43 is a knock sensor code
The ECM did not detect a knock signal during near wide open throttle operation with coolant temperature above 194 F or the knock signal was present for 5 seconds or more during normal engine operation.
Electronic Spark Control (ESC) Circuit .
That one may be a little more complicated. Fix the MAP problem and clear the computer and see if any come back.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title: