Transmission stuck in second

This topic contains 3 replies, has 2 voices, and was last updated by  mstern001 4 months ago.

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  • #10184

    stefansmith6989
    Participant

    I have a 99 Monte Carlo z34 with a 4t65e transmission . It is stuck in second gear unless I let off the gas pedal at a higher speed then it will up shift until I hit the gas then right back into second . I’ve replaced shift solenoids and the internal transmission wiring harness and still have the same problem.

    Need a replacement transmission? Quality transmissions are hard to find. Free estimate to your email.

    #10187

    mstern001
    Keymaster

    First things first, your Chevy is running in limp-home mode. The way your transmission is reacting is telling me that there’s something very basic and, potentially, major going on. Normally, limp-home mode comes on when something major fails — the torque converter or impeller or perhaps the input shaft or its bushings or the clutches/bands and gearing or a combination of several of the items.

    Limp-home mode gives you the ability to drive your Chevy home and then to a dealership or repair shop the next day for transmission work. It is not a long-term solution. In other words, it is meant to get your Chev in for repairs. By driving it continually in limp-home mode you are further damaging the transmission, which is a very big no-no.

    Here’s something you can do to help your technician find a quicker answer to your problem, run a diagnostic. There are several very good generic OBD-II scanners on the market. All you have to do is plug it into the diagnostic port at the left lower part of the dash panel and let it collect data. Then, take the scanner to your dealer or repair shop and have it read. It should point out the area that is failing and give you a good jump on finding the proper solution.

    There is one possible alternative: check to see if the solenoid for second gear is stuck. If it is that will make things much easier on your pocketbook. You can get that information from the diagnostic scan.

    #10188

    stefansmith6989
    Participant

    Well I’ve replaced all the solenoids except the input shaft speed sensor in the trans but it’s still giving me the p0753 code for shift solenoid a. Is it possible that something else could be wrong that caused the solenoid to go bad bc I’ve actually replaced both of them twice so far .

    • This reply was modified 4 months ago by  mstern001.
    #10191

    mstern001
    Keymaster

    I think you have hit the nail on the head. The continued p0753 code does indicate that Solenoid A, which controls the first two speed selections for the transmission, is bad, but, here’s the issue: why does the code keep popping?

    There are three possible reasons:

    1. A burned out wire
    2. A chafed wire
    3. A bad connector

    Suffice it to say, wires burn out. And, since the solenoid is an electronic device, linked to the electronic system in your Monte Carlo by wire, it is very possible for a wire to burn out, given the age of your Chev. It is, after all, 22 years old and the fine magnet wire used for the solenoids and other sensors, over time, can get brittle and break. Or, it can burn out due to overvoltages. I would start at the wire loom connecting to the solenoid pack, checking the signal (voltage) on each wire and then following each wire into the vehicle as far as you can go. Hopefully, you will be able to trace each test point to the source. It will take time as miles of wire are used in each vehicle, however, there’s nothing else for it. There are some very expensive testers out there that will power a de-energized circuit that will find out where breaks or burnouts might be.

    Besides burnouts, wires can also short out because wires have chafed against each other or they may have chafed against an exposed screw head or the body. Or, wires can go open — which appears like a short — and the electricity will stop flowing, as well.

    Finally, the crimp terminal at the base of the solenoid may have worn to the point where it has gone short and you may not even notice it because the wire still appears to be in good shape. The only way to test this is to place a volt-ohhmeter in the 13.8 volt position, hook one wire to ground and then probe the wire at the base and on the connector. If there is a test point available, test there too. Try to find where the voltage — hence the device — is failing.

    One thing to remember if this is the problem, if you have to replace any wires, it it best to route from source to the device. That is not an inexpensive proposition. And, since there are roughly 36 possible combinations to troubleshoot before you get to the right wire or wires, it will take you time. And rewiring will cost you money. If you cn do it yourself, then, you will save up to $150 to $200 per wire. If it is simply a connector that should cost about $75 to troubleshoot and replace.

    • This reply was modified 4 months ago by  mstern001.
    • This reply was modified 4 months ago by  mstern001.
    • This reply was modified 4 months ago by  Admin.

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