4L60E DTC P0470, which wire do I test?
08-21-2011, 05:15 PM
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4L60E DTC P0470, which wire do I test? So I finally got the GTO up and running. Throws 2 DTC's, P0470 and P0785. I see that the P0740 is a TCC malfunction. I checked the wiring harness at the green computer tan/black wire, then went to the connector on the trans looking for the corresponding tan/black wire. It is not there. What Am I missing? Where does this tan/black wire actually go from tthe PCM?
08-22-2011, 09:00 PM
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Lost Tan/Blk Wire OldGoat69:
You should be able to locate the The Tan/Blk wire at the transmission. It should go from C2-42, C2 is the green connector at the PCM, to pin T of C175 which is the big round connector on the the transmission. See attached drawing for the 4L60E pinout. The data I am providing is for a late model 4l60E that uses a PWM solenoid as part of the lock up logic.
The P-0785 is related to a 2-3 shift solenoid malfunction. be sure and verify you don't have the TCC solenoid and the 2-3 SS crossed up.
You should be able to locate the The Tan/Blk wire at the transmission. It should go from C2-42, C2 is the green connector at the PCM, to pin T of C175 which is the big round connector on the the transmission. See attached drawing for the 4L60E pinout. The data I am providing is for a late model 4l60E that uses a PWM solenoid as part of the lock up logic.
The P-0785 is related to a 2-3 shift solenoid malfunction. be sure and verify you don't have the TCC solenoid and the 2-3 SS crossed up.
Last edited by tinktoy; 08-22-2011 at 09:27 PM. Reason: Needed to add more data.
