P1880 code

[simple]

What does this code mean exactly and why would it come on? This is on my wifes 1997 Pontiac Bonneville.

 

P1880 Transmission Transfer Case Disengaged Solenoid Short to Battery

 

The check engine light went off by itself, and I cleared the code. Even when the check engine light was on for about 2 days the vehicle ran fine.

[GM-Tech]

Never heard of a P1880. Are you sure on that number? I just looked up your vehicle in our service information and no such code exists.

 

P1880 Transmission Transfer Case Disengaged Solenoid Short to Battery

 

Since when does a Bonneville have a transfer case. Never saw a 4-wheel drive Bonneville!

[95Sierra2500]

What does this code mean exactly and why would it come on?  This is on my wifes 1997 Pontiac Bonneville. 

 

P1880 Transmission Transfer Case Disengaged Solenoid Short to Battery

 

The check engine light went off by itself, and I cleared the code.  Even when the check engine light was on for about 2 days the vehicle ran fine.

 

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Umm...that shouldn't be coming up on a Bonne...Are you sure someone hasn't re-tuned the PCM and accidentally added that code? I'm sure it won't ever give you a problem since you don't have a transfer case...

[simple]

Yeah, I'm pretty sure the code read 1880. It described it as a transmission malfunction or something. Shoot, I should have written it down. I read and scaned the code myself so nobody re-tuned anything.

I admit it's weird.

[GM-Tech]

Maybe it was P1870? That's a valid code.

[simple]

Maybe it was P1870?  That's a valid code.

 

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Yeah, I think you're right. This code pertains to the transmission slipping or something? At any rate, what would cause a 1870 code?

[GM-Tech]

  At any rate, what would cause a 1870 code?

 

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P1870 is a slip code. Most lilkely your torque converter clutch is not coming on. If it was a rear wheel drive truck, I'd say valve body, but I don't know on a Bonneville. This code usually takes a bit of driving at highway speeds before it sets. And it does not affect the engine in anyway except that the rpms are higher because the clutch is not on.

[simple]

  At any rate, what would cause a 1870 code?

 

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P1870 is a slip code. Most lilkely your torque converter clutch is not coming on. If it was a rear wheel drive truck, I'd say valve body, but I don't know on a Bonneville. This code usually takes a bit of driving at highway speeds before it sets. And it does not affect the engine in anyway except that the rpms are higher because the clutch is not on.

 

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You're 100% correct about driving at highway speeds before it sets. My wife was driving for about 5 hours at highway speeds.

 

So, if the rpms are higher does this mean the transmission isn't going into overdrive? I wasn't with my wife to actually see or hear the rpms.

[GM-Tech]

So, if the rpms are higher does this mean the transmission isn't going into overdrive?

 

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No, overdrive is fine but with the torque converter disengaged, the normal slippage will cause a 200-300 rpm increase (or thereabouts).

 

This problem "usually" doesn't occur around town because you may never reach the speed needed for it to engage or you don't stay at that speed for a long enough period of time.

 

It could be something as simple as a bad brake switch or it could be valve body, torque converter, etc.

[simple]

Thanks GM-Tech.

[95Sierra2500]

I'd suggest heading over to www.clubgp.com and searching around on there, perhaps getting an account and then posting. There are guys over there who know ALOT about the 4T65E trans...probably more than people should.