Apr 25, 2016, 05:41 PM
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4l60 wont shift out of first
4l60 wont shift out of first I have a issue with my transmission it won't shift out of first. I tried doing research but everyone issues end up being the vss. But mine is working properly I even tried manually shifting the transmission out of first and still wont get out of it. Any pointers on what it could be or is transmission toast?
TECH Junkie
Joined: May 2012
Posts: 3,050
Likes: 716
From: Poplarville, MS
After doing a simple search on the codes that you posted. It seems that you have some electrical problems with your pressure manifold switch and TCC PWM solenoid. I know from experience that a defective pressure manifold switch will make a trans do some stupid things.
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TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
Check your harness over real good, Maybe it got on the exhaust or something.
P0740 is for the TCC Enable solenoid (Part of the harness)
P1810 is for the Pressure switch manifold.
P1860 is for the TCC PWM solenoid.
I rarely see PSM's go bad, Maybe 1 every couple years, It very well may be bad, But a shorted wire will set P1810 also.
Same goes with the other 2 codes (Shorted or Open wires).
Good Luck! Having 3 electrical components bite the dust is not likely....But possible, I hate to see people blindly throw parts at problems, All it does is make your wallet lighter.
P0740 is for the TCC Enable solenoid (Part of the harness)
P1810 is for the Pressure switch manifold.
P1860 is for the TCC PWM solenoid.
I rarely see PSM's go bad, Maybe 1 every couple years, It very well may be bad, But a shorted wire will set P1810 also.
Same goes with the other 2 codes (Shorted or Open wires).
Good Luck! Having 3 electrical components bite the dust is not likely....But possible, I hate to see people blindly throw parts at problems, All it does is make your wallet lighter.
TECH Junkie
Joined: May 2012
Posts: 3,050
Likes: 716
From: Poplarville, MS
I did not mean to imply that the solenoid and manifold pressure switch were the problem but that the problem was in those electrical circuits.
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
I didn't mean to come off as dick, I wasn't aiming my post at you or anyone else that posted, I just wanted the OP to visually inspect the harness thoroughly before going further.
TECH Junkie
Joined: May 2012
Posts: 3,050
Likes: 716
From: Poplarville, MS
It’s all good man; I didn’t take it that way. I was in a hurry and should have been more specific in about what I was saying. You make a very good point about the harness. I agree so many go off halfcocked and waste a lot of money. It’s nice to have someone else as knowledgeable as you on here answering questions.
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
Your going to have to do some diagnostics, Lets start with the P0740 & P1860 (TCC Enable & TCC PWM solenoid).....I'm GUESSING this is a gen 3 engine & harness?
Unhook battery, Disconnect both PCM connectors, Reconnect battery.
Key on, Probe pin 42 of the Blue PCM Connector with a Test light that is hooked to ground, The test light should light up.
Next, Take a fused jumper wire & Apply ground to pin 42, You will here a click if the solenoid is good, (Don't be surprised if it only clicks once, Some TCC Enable solenoids don't release without fluid pressure acting on them) This tests the TCC enable circuit per P0740.
Key on, Probe pin 2 of the Blue PCM Connector (Bla,bla, Same as above), Though TCC PWM solenoid should click every time. This tests the TCC PWM solenoid circuit per P1860.
Get back to me on these tests. Here is a diagram that may help.
Unhook battery, Disconnect both PCM connectors, Reconnect battery.
Key on, Probe pin 42 of the Blue PCM Connector with a Test light that is hooked to ground, The test light should light up.
Next, Take a fused jumper wire & Apply ground to pin 42, You will here a click if the solenoid is good, (Don't be surprised if it only clicks once, Some TCC Enable solenoids don't release without fluid pressure acting on them) This tests the TCC enable circuit per P0740.
Key on, Probe pin 2 of the Blue PCM Connector (Bla,bla, Same as above), Though TCC PWM solenoid should click every time. This tests the TCC PWM solenoid circuit per P1860.
Get back to me on these tests. Here is a diagram that may help.
