Menu

4l60e tranny issues?

  • Creator
    Topic
  • #597989
    TannerTanner
    Participant

      1996 chevy k1500 4l60e

      The other morning when I got up to go to work I started my truck as usual and let it run for a minute or two before leaving. I noticed that my check engine light had come on very soon after starting the truck. I have a scan gauge two and it said that I had a p1860 code. I didn’t have time to figure that out so I tried to clear it to see if it would go away. But it came right back almost instantly. So I left and noticed that my truck shifted quite hard and not normal.

      After driving a fe minutes the light was really bugging me so I cleared it again and it didn’t come back and it started shifting normal. I haven’t seen the code since and it doesn’t shift nearly as hard any more. However it does seem to hesitate to shift down and sometimes shifting up once in a while. I’m pretty sure it’s not slipping it will spin the tires pretty easy.

      The code apparently means that the circuit to the torque converter clutch pulse modulation solenoid is having problems or that the solenoid is. Does any one know more about this? It seems to have more issues shifting when it’s cold. And the fluid looks good and doesn’t smell burnt but it probably wouldn’t hurt to change it.

      Thanks!

    Viewing 8 replies - 1 through 8 (of 8 total)
    • Author
      Replies
    • #598025
      Joeseph MamaJoeseph Mama
      Participant

        Problem:

        When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type B DTC.

        Possible Causes:

        – Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
        – Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
        – Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection

        Electrical:

        Suggestions:

        TCC solenoid appears to be ground switched via the “T” pin. It is supplied with a constant source of 12v power from the “E” pin. First, test and make sure you have source voltage power at the “E” pin (this may be tied into the ignition, turn the key to the ‘RUN’ position.) Next, ohm check the ground circuit for continuity as well as unwanted resistance (the ASE spec is .10v voltage drop.) Now try dropping the transmission pan and disconnect the transmission electrical connection. Jump the respective “E” pin connections together so that the solenoid is supplied with power. Next, apply ground to the “T” pin. You should be able to hear a clicking sound. If no click, then replace solenoid. If the solenoid does click, then you must test the associated electrical circuit for faults.

        *Another test you could perform at this point could be to unplug and ohm test the solenoid itself for continuity.

        Eric has a nice video here on how to perform these electrical tests.

        4L60E Valve Body:

        Failure to resolve this issue may result in premature wear or possible damage to the torque converter. In this case, it would be advised to totally disconnect electrical connectivity to the TCC solenoid to eliminate TCC lock-up, resulting in reduced fuel economy.

        #598042
        college mancollege man
        Moderator
          #598410
          EricTheCarGuy 1EricTheCarGuy
          Keymaster

            A lot of good information here. I’ll just add this.

            http://www.ericthecarguy.com/faq/solving-transmission-problems

            Good luck and keep us posted.

            #604426
            TannerTanner
            Participant

              hey thanks for the info! i have been reading as much as i can on it, however i have not had any problems since that one morning. no codes or hard shifts or anything. in fact it feels to me as though it shifts better and smoother. I am still a little suspicious though things like that usually dont just mysteriously disappear. but also im working part time and getting ready for college so im not really sure what direction to head :/

              #604562
              EricTheCarGuy 1EricTheCarGuy
              Keymaster

                Electrical problems can be intermittent like that. Perhaps the problem has corrected itself. Keep us posted if that’s not the case.

                #604648
                John HugonJohn Hugon
                Participant

                  If it does it again…check the voltage at the TRANS fuse (#20)in the inst panel fuse box. If the voltage is lower than 13-14 volts, check the ignition switch.

                  #616258
                  TannerTanner
                  Participant

                    I just thought I would give a quick update. I still have not had this problem reappear or had any hard shifting. everything seems to be working just fine now 🙂

                    #646723
                    Beth JacksonBeth Jackson
                    Participant

                      Great! If you don’t mind I’d also like to recommend this manual which was recommended to me and downloaded here. http://www.4l60eguide.com/. It is a complete guide and it has helped me a lot. It has a ton of information in it that helped me
                      rebuild/repair 4l60e transmission. It also includes useful diagrams and pictures, plus diagnosis and repair solutions. It might help you in the future.

                    Viewing 8 replies - 1 through 8 (of 8 total)
                    • You must be logged in to reply to this topic.
                    Loading…