P2127 back again - sort of

[navyjoe]

Ever had this code be temperature dependent? Haven't had this code for a year or so. The first warm weather and it popped up. It turned cold again and it gone. Wouldn't this like be a connector problem in the engine compartment?

I want to unplug C130 (or is that C331?) on the firewall and C1 and C2 at the ECM. Some questions on doing this properly.

1. I assume I should disconnect the Batteries first, True or False?

2. Should I not try spraying the connectors with cleaner BEFORE disconnecting them?

3. C1 and C2. Don't I have to remove a nut or screw in order to disconnect? They are hard to get to and I can't quite see whats down there. Personally I have to disturb them being 10 years old. Seems like asking for trouble.

4. Once connectors are disconnected what is the best maintenance procedure? I would assume to spray with contact cleaner and reassemble or is it appropriate to add some lube to the connector as well.

PS I have an 06, 3500, (diesel of course)

 

[p-Bar]

Yes from what I remember there is an allen screw in the middle on each.

 

[Ozymandias]

It is, and best way to it is from underneath.

And yes of course disconnect the batteries first.

 

[navyjoe]

Yes from what I remember there is an allen screw in the middle on each.

Thanks for the feedback. If it is an allen screw, I would assume it is metric ?? I redid the battery grounds on the fenders, the battery terminals, and the firewall connector. So far the code has not come back. I hate to remove the ECM connector if I can keep from it since to me there would be much room for error. Also would I have to disconnect the battery or can I pull a fuse somewhere to get the same result?

 

[Wayne M.]

Navyjoe, I had a phantom P2127 and a real Visitronic fan code. I found a wire at the visi harness rubbed through, and possibly shorting. I replaced the clutch and haven't seen 2127 in a long time. I also had a slight idle stumble that made me change the FCA that didn't help. The idle problem also vanished when I changed the clutch. I'm assuming the short was dragging down VREF or the bus.

 

[navyjoe]

Navyjoe, I had a phantom P2127 and a real Visitronic fan code. I found a wire at the visi harness rubbed through, and possibly shorting. I replaced the clutch and haven't seen 2127 in a long time. I also had a slight idle stumble that made me change the FCA that didn't help. The idle problem also vanished when I changed the clutch. I'm assuming the short was dragging down VREF or the bus.

That is interesting. Computer controls in a vehicle like ours can drive you nuts sometime. the controls design really needs to be more robust but we probable couldn't afford the cost if it was. I just traded cars with my son. He had a 2000 Pontiac Sunfire. I am amazed to drive that car. The only thing automatic is the transmission. Manual door locks, seats, windows, trunk, rear-view mirrors (the right side doesn't even have a inside knob), radio. It stuns me how simple a car can be.

 

[navyjoe]

Yes from what I remember there is an allen screw in the middle on each.

It is, and best way to it is from underneath.

And yes of course disconnect the batteries first.

Thanks to both of you. Good to know. I see to it that I have an allen wrench for it in my kit.

 

[Wayne M.]

That is interesting. Computer controls in a vehicle like ours can drive you nuts sometime. the controls design really needs to be more robust but we probable couldn't afford the cost if it was. I just traded cars with my son. He had a 2000 Pontiac Sunfire. I am amazed to drive that car. The only thing automatic is the transmission. Manual door locks, seats, windows, trunk, rear-view mirrors (the right side doesn't even have a inside knob), radio. It stuns me how simple a car can be.

YES- but even still there are electronics in that car too. I remember a GM J body just like that one that drove me nuts. It was a rotted pin in the fuel pump relay - another story from another time.
I'll give you my Duster. Now THATS simple. It only has 5 fuses! The slant 6 cars are what almost put Chrysler out of business the first time. They left the dealer and never went back.

 

[navyjoe]

YES- but even still there are electronics in that car too. I remember a GM J body just like that one that drove me nuts. It was a rotted pin in the fuel pump relay - another story from another time.
I'll give you my Duster. Now THATS simple. It only has 5 fuses! The slant 6 cars are what almost put Chrysler out of business the first time. They left the dealer and never went back.

HA!! My wife had a duster when we first married. You are so right. That slant 6 was a great engine!