Code 41
Thread Starter
Racer
Joined: Jul 2004
Posts: 468
Likes: 28
Code 41 - Engine (LT1) turns over but won't start
On my 1992 I spun the rear wheels a little after washing the car and the "Service ASR" light came on. I put it in my garage after that and did not start it again for 2 days. When I next started to drive it, it turned over fine, but would not start. I let it sit for a day. The next day it started fine. I drove it about 40 miles and returned it to my garage. One day later and it won't start again. While cranking "SYS" is displayed on the LCD. I checked the codes and got a "C41" (Loss of ECM Data Communications) on the CCM (Module 1), an "ERR" on Module 4 (ECM), and a "H72" (Serial Data Link Fault) on the ASR ECBM (Module 9). Does anyone know how to diagnose my problem and suggest what I can do? Thanks. Also, does anyone know of a good Vette mechanic in the No. Virginia area?
Last edited by c2c4c6; Sep 5, 2004 at 10:35 PM. Reason: Add a request for a Vette mechanic and change title.
Safety Car
Joined: Oct 2000
Posts: 4,226
Likes: 347
From: Albuquerque, NM
I had a very similar problem with my '92 several years ago. Intermitently the car would not start, and SYS would flash occasionally while driving. I got a codes 41, 72, and also another one (54, if I remember correctly--something to do with the fuel pump). My problem turned out to be a faulty ECM (the unit with all the wires directly above the battery). I replaced the ECM with a rebuilt one and I haven't had any problems since.
Safety Car
Joined: Oct 2000
Posts: 4,226
Likes: 347
From: Albuquerque, NM
If I remember correctly, the rebuilt ECM was about $100 (exchange). Try Mid America at madvet.com and The Last Detail at tld-corvette.com .
I didn't have to replace any ABS or ASR parts. These systems are pretty reliable and just about all the problems with ABS and ASR will be computer related. Just as a side note, check your brake fluid level. As the pads wear the level in the reservoir drops, and that can occasionally set off the ABS and ASR lights.
I didn't have to replace any ABS or ASR parts. These systems are pretty reliable and just about all the problems with ABS and ASR will be computer related. Just as a side note, check your brake fluid level. As the pads wear the level in the reservoir drops, and that can occasionally set off the ABS and ASR lights.
Advanced
Joined: Feb 2004
Posts: 72
Likes: 0
From: Huntsville Alabama
Originally Posted by c2c4c6
I checked the codes and got a "C41" (Loss of ECM Data Communications) on the CCM (Module 1), an "ERR" on Module 4 (ECM), and a "H72" (Serial Data Link Fault) on the ASR ECBM (Module 9). Does anyone know how to diagnose my problem and suggest what I can do? Thanks. Also, does anyone know of a good Vette mechanic in the No. Virginia area?
On my 93 vette, the problem was the ECM which was intermittent and temperature sensitive. Ran the car until the lights came on and drove it home. I placed an zip lock bag full ice on the ECM and the lights went out. Heated the ECM with the key on, engine off and the lights came on. One other simple test is the "thump" test. Tap the ECM (NOT with a hammer!) and see if the lights come on or go off. If these do not help, then you need a service manual to track down whether the serial wires are open or shorted, whether there is a bad ground, or least likely of all, the CCM has failed.
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