code #42

Reply Subscribe

Thread Tools

Search this Thread

07-28-2003, 02:37 AM

windnsea00

Registered User

Thread Starter

Join Date: Feb 2003

Location: la jolla, ca

Posts: 149

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?

07-28-2003, 12:19 PM

windnsea00

Registered User

Thread Starter

Join Date: Feb 2003

Location: la jolla, ca

Posts: 149

anyone?

07-28-2003, 12:32 PM

Injuneer

Administrator

Join Date: Nov 1998

Location: Hell was full so they sent me to NJ

Posts: 70,677

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

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

07-28-2003, 01:53 PM

Laymaster

Registered User

Join Date: Apr 2001

Location: Old Bridge, NJ 08857

Posts: 658

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.

04-28-2004, 09:04 AM

WS Sick

Registered User

Join Date: Dec 2003

Location: Oklahoma where trees are made of wood.

Posts: 2,725

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.

04-28-2004, 12:04 PM

shoebox

Registered User

Join Date: Dec 1969

Location: Little Rock, AR

Posts: 27,709

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.