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Oletrapper

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Oletrapper Enthusiast

Oletrapper

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I'll try to be brief. History: 1997 1500 Surburban. Had the trans overhauled, 4L60E. They also replaced the ECM. Now I have an erratic speedometer and anti-lock brakes don't work properly. Also throwing TCC codes. Returned to trany shop and they replaced the torque converter clutch solenoid on the valve body. Worked okay for a while. TCC codes are back. TEC 2 shows the speed sensor on transfer case working properly. TEC 2 shows vehicle going 6MPH while at a dead stop. I have replaced the speedo head three (3) times with used units and they all acted the same as original. (thank god I know someone who owns a salvage yard) Anyone been here before? Thanks, OT

Oletrapper Enthusiast

Oletrapper

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Trany shop said that is what caused the transmission to fail. I checked the ECM and it was replaced. First trany they put in failed and that is when they found the bad ECM.

 

 

 

 

Welcome aboard :withstupid: What was wrong with the ECM?
Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Well, It looks like nobody has had this problem. Guess it is off to the Dealer. $$$$$$$$$$$

Sorry Bob. I am no help. What you describe just isn't something I have heard people having issue with. Are you 100% certain the trans shop knows what they are talking about? Sounds like they are guessing.

 

I hope you get it worked out.

Oletrapper Enthusiast

Oletrapper

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Thanks Jim, I was a little suspect of their diag. I have a son-in-law who is one of the best trany guys in the area but he is not the one who did the work. He was booked up and couldn't get me in. (yes, we are still speaking) He told me that it is not uncommon for the ECM to take out the 4L60E trany and that he had run into it before. I talked with him yesterday and he thinks the ECM that was replaced needs to be flashed or returned for a replacement. He feels that the one that is there now has some problems. I will say this. After getting the vehicle back, it started setting all kinds of codes which were not present before the ECM replacement. I can't recall the code numbers but everyone it has set has been correct. Example: Bad o2 sensor passenger side rear..It was bad. Random misfires. Plugs and wires were bad. The original ECM did not flag these problems which tends to say it (ECM) was bad. I am going back to the shop that did the repairs and ask that ECM be flashed or replaced. I have known these people for over 40 years and they have a good reputation but also have some new (young) people working there. Will let you know what the outcome is for others future reference. Thanks, Bob

 

Well, It looks like nobody has had this problem. Guess it is off to the Dealer. $$$$$$$$$$$

Sorry Bob. I am no help. What you describe just isn't something I have heard people having issue with. Are you 100% certain the trans shop knows what they are talking about? Sounds like they are guessing.

 

I hope you get it worked out.

 

Draenor Senior Enthusiast

Draenor

Posted
Posted
He told me that it is not uncommon for the ECM to take out the 4L60E trany and that he had run into it before. I talked with him yesterday and he thinks the ECM that was replaced needs to be flashed or returned for a replacement.

 

I don't think its a common problem, or a common problem from what I have seen. True the ECM may need to be re-flashed. Has the wiring been checked, especially the ground to the ECM? Is the shop disconnecting the battery before installing the ECM? Its strange that it would fail again.

 

 

Do you live up north where salt is put on the roads in the winter?

Oletrapper Enthusiast

Oletrapper

Posted
  • Author
Posted
He told me that it is not uncommon for the ECM to take out the 4L60E trany and that he had run into it before. I talked with him yesterday and he thinks the ECM that was replaced needs to be flashed or returned for a replacement.

 

I don't think its a common problem, or a common problem from what I have seen. True the ECM may need to be re-flashed. Has the wiring been checked, especially the ground to the ECM? Is the shop disconnecting the battery before installing the ECM? Its strange that it would fail again.

 

John, Don't know if they disconnected the bat. or not. I wasn't there when any of the work was done. I suspected a bad ground early on and everything seems to be connected where it should be. Speedo and wheel sensors the only things not working properly now. Hope the re-flash works.

 

 

Do you live up north where salt is put on the roads in the winter?

 

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