code #42

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Jul 28, 2003 | 02:37 AM

windnsea00

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Joined: Feb 2003

Posts: 149

From: la jolla, ca

code #42

i had my car scanned today and it happened to throw the code #42...it said the EST was grounded....anyone know what that may be referring to?

Jul 28, 2003 | 12:19 PM

windnsea00

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Registered User

Joined: Feb 2003

Posts: 149

From: la jolla, ca

anyone?

Jul 28, 2003 | 12:32 PM

Injuneer

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Joined: Nov 1998

Posts: 71,086

From: Hell was full so they sent me to NJ

DTC 42 = Ignition Control (IC) circuit (shorted or grounded circuit)

Check out the list on Rob/Shoebox's code list

Jul 28, 2003 | 01:53 PM

Laymaster

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Joined: Apr 2001

Posts: 658

From: Old Bridge, NJ 08857

I had that code for a while, it happened when I swapped the coils in my 95 with the other car we have the 93 formula. Swapped them back and the code went away.

Apr 28, 2004 | 09:04 AM

WS Sick

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Joined: Dec 2003

Posts: 2,724

From: Oklahoma where trees are made of wood.

I had this code as well when I changed my Ignition module, I found out they gave me a generic one, I went to GM and got the 97 specific one and it went away. The car stayed in limp home mode until then.

Apr 28, 2004 | 12:04 PM

shoebox

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Joined: Dec 1969

Posts: 27,725

From: Little Rock, AR

The code may have occurred at any time in the past. The PCM sensed improper voltage to the ICM. Sometimes you can get a hiccup that will cause it. If you are not having any drivability problems right now, just clear it and see if it comes back.