throwing a 41 code
Thread Starter
Pro
Joined: Feb 2006
Posts: 502
Likes: 1
From: Schwenksville PA
throwing a 41 code
Trying to diagnose a no start problem. I thought it might be the starter but the CCM is throwing a code 41. Ive been reading the FSM and not being an electrical technician I am lost. I am ready to have it towed to the shop but figured I would see what the experts on the Forum had to say.
any guidance, directions or help for a non electrical guy to diagnose an electrical problem would be appreciated oooooor is it best to bite the bullet and bring it to a shop ?
thanks
any guidance, directions or help for a non electrical guy to diagnose an electrical problem would be appreciated oooooor is it best to bite the bullet and bring it to a shop ?
thanks
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
I'd start with having the ignition control module (ICM) tested. Some parts stores can test them for you. The ICM is located on a bracket next to the coil. If it is bad, the replacement should come w/packet of grease which goes on the backside of ICM to transfer heat away from the module. 
BTW You mention starter--the info above relates to the code 41--Is the engine not turning over OR turning over and not starting/running?
BTW You mention starter--the info above relates to the code 41--Is the engine not turning over OR turning over and not starting/running?
Last edited by TWISTERUP; Dec 29, 2009 at 12:45 PM.
Thread Starter
Pro
Joined: Feb 2006
Posts: 502
Likes: 1
From: Schwenksville PA
Is the starting issue separate from the code 41 issue or are they related ? in other words, do I pull the starter and have it checked then pursue correcting the code 41 issue.
thanks
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
CCM DTC 41 indicates the CCM can not communicate with the ECM.
First clear the DTC 41. Easiest way is to disconnect the negative battery cable for a couple of seconds.
Verify CCM DTC 41 sets again.
You should also see ERR displayed for Module 4 which is the ECM.
If you do see ERR displayed for Module 4, to verify the ECM is
functioning, short Pin A to Pin B on the Diag. connector and turn the ignition ON.
[F|E|D|C|B|A]
[G|H|J|K|L|M]
The Service Engine Soon Light should flash code 12 three times, DTC's
three times if there are any and then flash code 12 again 3 three times.
Example code 12 would be Flash pause Flash, Flash. Long pause between codes.
If the Service Engine Soon lamp does not flash any codes assuming the light bulb is good, the ECM is bad, the Eprom inside the ECM is bad or power or ground for the ECM is bad.
There is a used ECM on E-bay for $300.00. no core exchange.
First clear the DTC 41. Easiest way is to disconnect the negative battery cable for a couple of seconds.
Verify CCM DTC 41 sets again.
You should also see ERR displayed for Module 4 which is the ECM.
If you do see ERR displayed for Module 4, to verify the ECM is
functioning, short Pin A to Pin B on the Diag. connector and turn the ignition ON.
[F|E|D|C|B|A]
[G|H|J|K|L|M]
The Service Engine Soon Light should flash code 12 three times, DTC's
three times if there are any and then flash code 12 again 3 three times.
Example code 12 would be Flash pause Flash, Flash. Long pause between codes.
If the Service Engine Soon lamp does not flash any codes assuming the light bulb is good, the ECM is bad, the Eprom inside the ECM is bad or power or ground for the ECM is bad.
There is a used ECM on E-bay for $300.00. no core exchange.
Last edited by Hooked on Vettes; Dec 30, 2009 at 04:17 PM.
