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Eric
Eric, Automotive Repair Shop Manager
Category: Car
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Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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Isuzu Trooper: Code p1860 on 2001 Isuzu Trooper. Is that the

Customer Question

Code p1860 on 2001 Isuzu Trooper. Is that the TCC solenoid or a 1234 shift solenoid? Any usual suspects i should check out first? The trans has been recently (20k ago) rebuilt. I will obviously check wiring first in-case the rebuild / installation caused problem but would like to have parts ordered before dropping pan so need some help.
Submitted: 4 years ago.
Category: Car
Expert:  Eric replied 4 years ago.

HI,

Ok, first check the 4 pin connector on top of transmission to make sure it is connected securely. Next on the red connector to the ECM, check continuity or pins 51 and 33. Repair short if required. If continuity is ok, then replace the TCC solenoid. Most of the time it is the TCC solenoid


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Customer: replied 4 years ago.

Ok the TCC solenoid on these gm trans (4L30E) are the same as the shift solenoid right? When i looked up the napa part i came up with no description other than "A/Trans Solenoid"...

Expert:  Eric replied 4 years ago.
Hi,

Let me see if I have the part number handy
Expert:  Eric replied 4 years ago.
Hi,

It is not the same thing as shift solenoids. It will be listed as either a TCC solenoid, TCC PWM solenoid or just PWM solenoid.


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Expert:  Eric replied 4 years ago.
I noticed we have not yet resolved your concern you asked about. I would sure appreciate it if you would reply so I can offer my skills and knowledge and repair guide access to help as best I can.


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Customer: replied 4 years ago.

It took some time to get back to the truck but i did test 51 and 33 and there is no continuity between them. If i understand you correctly that is what i am supposed to find? I went ahead and replaced the solenoid and reset the ecm and the code came back on in a matter of a few miles. No drive-ability issues though, it shifts fine.

Expert:  Eric replied 4 years ago.
HI,

If there is continuity, then replace the solenoid. If no continuity, then repair short in wiring harness. you will need to trace the wiring and repair short. Start with the 4pin connector atop transmission and work back. check carefully for bent or corroded pins at the connector.


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