Module 4 no code only ERR
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 1,185
Likes: 33
From: Charlotte Michigan
Module 4 no code only ERR
Working on my 1993 LT1 Six speed.
Problem began during my fuel economy run contest at Eureka Springs Corvette Weekend. During the course of the event the speedometer went out and odometer locked the mileage, asr and abs light plus service light came. Car bucked a couple of times as it was at a low rpm. I would let it coast in neutral with clutch in going down hill so it was just idling. When I stopped along the route and shut engine down it would reset and speedometer would work until it happened again. Did this all the way home to Michigan. I have a battery shut off and reset the computer several times to no avail. Thought it was the VSS but just removed it and it checks out ok.
Codes C25, C41, H25, H41, H54, H62, H72 and in module 4 displayed ERR.
I thought that code 41 may have been set as a result of low engine rpm and vehicle speed of 40 plus mph. The history code H54 was due to a fuel pump going out and replaced 3 weeks ago before trip. The H62 was from the previous engine that overheated. The H72 not sure about as it is not in my fsm. I see in one article it was only referenced to the 94-96 C4's.
With the module 4 showing ERR would that put the car in limp home mode?
When ignition is turned on the both fans for the radiator come on even though a/c is off. That happend after I was checking the codes. I have not started the engine since than and will need to wait until I reinstall vss back in transmission. Be next week before I can do anything an some time to do more research for answers.
Thanks everyone in advance for any help.
Problem began during my fuel economy run contest at Eureka Springs Corvette Weekend. During the course of the event the speedometer went out and odometer locked the mileage, asr and abs light plus service light came. Car bucked a couple of times as it was at a low rpm. I would let it coast in neutral with clutch in going down hill so it was just idling. When I stopped along the route and shut engine down it would reset and speedometer would work until it happened again. Did this all the way home to Michigan. I have a battery shut off and reset the computer several times to no avail. Thought it was the VSS but just removed it and it checks out ok.
Codes C25, C41, H25, H41, H54, H62, H72 and in module 4 displayed ERR.
I thought that code 41 may have been set as a result of low engine rpm and vehicle speed of 40 plus mph. The history code H54 was due to a fuel pump going out and replaced 3 weeks ago before trip. The H62 was from the previous engine that overheated. The H72 not sure about as it is not in my fsm. I see in one article it was only referenced to the 94-96 C4's.
With the module 4 showing ERR would that put the car in limp home mode?
When ignition is turned on the both fans for the radiator come on even though a/c is off. That happend after I was checking the codes. I have not started the engine since than and will need to wait until I reinstall vss back in transmission. Be next week before I can do anything an some time to do more research for answers.
Thanks everyone in advance for any help.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 1,185
Likes: 33
From: Charlotte Michigan
No. Just started when lost speedometer. I do have an extra ECM, would need to swap out prom to see if it is a ecm problem. Waiting for a new o-ring to put on the vss of the old one to reinstall. Or go ahead and install the new vss.
