95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful in Past Cadillac Vehicle Discussion; I could use some help here, I pulled this code using the manual method and I think this code means ...
  1. #1
    Rasmus Fog is offline Cadillac Owners Member
    Automobile(s): Eldorado
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    95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful

    I could use some help here, I pulled this code using the manual method and I think this code means a sensor to the transmission input shaft is bad. My level is Jr. Woodchuck III, experienced on Corvette OBDI & II, any and all help appreciated. Low mileage Eldorado car is worth saving. Thanks

    If that sensor is the problem I have no idea where it is located so any help is appreciated twice!
    Chuck

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: 95 Eldorado - Code PO56 current, car runs terrible, lurches, misses, awful

    IF it is the Input Speed Sensor (ISS), that's a $50 part buried $2,000 in labor inside the transmission. Its replacement requires transmission removal and disassembly.

    Use the link in the sticky post ^^^ "How to pull codes" to get to the code definitions for OBD1 codes.

    There are several recent threads with a diagram of all 4T80E sensors and switches - but it's a 1998 and later transmission so there are a couple of differences - but not the ISS, unfortunately. The diagram is also in my albums.

    A faulty ISS will not cause an engine miss - that's another bugaboo somewhere.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful

    Quote Originally Posted by Rasmus Fog View Post
    If that sensor is the problem I have no idea where it is located so any help is appreciated twice!
    Chuck
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  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    Re: 95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful

    Quote Originally Posted by Rasmus Fog View Post
    If that sensor is the problem I have no idea where it is located so any help is appreciated twice!
    Chuck
    The transmission is driven by an input shaft and articulated link chain, very similar to a stock timing chain setup. The ISS is inside the chain run loop with it's Hall effect end in extremely close proximity to the input gear teeth.

    It is used by the PCM/ECM to correlate engine input shaft speed with transmision load, gear, and shift functions.

  6. #5
    Rasmus Fog is offline Cadillac Owners Member
    Automobile(s): Eldorado
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    Re: 95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful

    Thanks guys for your info & advice, I understand, P056 is not good news. Is there anything else I should know about that would cause that code in error? I suspect the value of this vehicle just took a nose dive. Anything else?

  7. #6
    Rasmus Fog is offline Cadillac Owners Member
    Automobile(s): Eldorado
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    Re: 95 Eldorado - Code P 056 current, car runs terrible, lurches, misses, awful

    Vehicle was towed to local mechanic shop, he replace a couple of coil packs and the TPS. Engine runs good now and vehicle can be driven. Price was reasonable too. No conclusion on the 056 error code. Thanks for the input / support guys!

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