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post #1 of 16 (permalink) Old 04-02-2013, 04:10 PM Thread Starter
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P1810 Code / Occasional Hard Shift

I had a P1810 code show up, (P1810 Transmission Fluid Pressure (TFP) Position Switch Circuit TCM)
I read a little about it, and I don't know much about cars, so I hope to get some info before having a mechanic tell me something beyond the real problem.

I noticed a harder shifting occasionally (but I read about this online). curious though, would this problem be associated along with this issue i'm having. when I press the break, the lock disengages in the automatic shifter to allow it to move out of park. Normally in drive, when you press the brake, there is no clicking/disengaging sound coming from the shifter. but after driving a bit, i start to hear the click every time i press the brake... this is when I know that the car will shift into the first 2 gears very firm.

are these 2 things associated? I'm hoping so, and it's just a 1 item fix.

thanks for any info. sorry I know very little about cars. but i'd rather tell you that than the mechanic!
2006 Cobalt 2.2 automatic.

Last edited by jessetheaviator; 04-02-2013 at 04:13 PM.
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post #2 of 16 (permalink) Old 04-02-2013, 04:31 PM
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I'm sure Coby will be able to help with this one as he has the tech info readily available and I don't atm.

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post #3 of 16 (permalink) Old 04-02-2013, 05:47 PM
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I'm no mechanic but here is my thoughts on this. If you can still hear the shifter solenoid, after you have pull away from park position, tells me that you probably are having a failing P/N position switch. The "ECM" doesn't seem to know that your car is out of park. At this time TCM applies maximum fluid pressure hence the harsh shift. But code seems to indicate a solenoid problem. Did you only have a P1810 or was it accompanied by a P1816?

More info on P1080

Conditions for Setting the DTCP1810
The TCM detects an invalid gear range for 60 seconds. Refer to Transmission Fluid Pressure Manual Valve Position Switch Logic .

P1816
The TCM detects P/N with a drive ratio for 6 seconds.

P1818
The TCM detects a PARK, NEUTRAL, or a drive range with a REVERSE ratio for 3 seconds.

Action Taken When the DTC Sets
• DTCs P1810, P1816, and P1818 are Type B DTCs.

• The TCM commands maximum line pressure.

• The TCM freezes transmission adaptive functions.

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post #4 of 16 (permalink) Old 04-02-2013, 07:31 PM Thread Starter
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Thanks for the reply

actually the shifting problem/transmission hard shift happened about 3 times before the check engine light came on. and, as luck would have it, as soon as the guy from autozone comes out to check the engine light, it doesn't come on. he wasn't positive if it would sense any previous code, but it did. however, whos to say another code would not be present when the actual light is on.

also once the hard shifting/shift handle clicking starts to occur (which is randomly when i drive and doesn't go away until i let the car sit a while).. the hard shift occurs when i initially go from park to drive/neutral and when i put it back into park. I don't know if this info is relevant, just thought i'd pass it on.
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post #5 of 16 (permalink) Old 04-03-2013, 06:04 AM
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Maybe start by cleaning the P/N switch connector. It sits on top of the transmission drivers side. Depending on your year it will have 1 or two connectors. It's location makes it a prime target for road grime.

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post #6 of 16 (permalink) Old 04-08-2013, 02:26 PM Thread Starter
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well, I dropped my car off at AAMCO on friday morning like they asked me to. They didn't check it until Saturday afternoon, 1 hour before they closed.. they could not find the issue. Monday afternoon they finally said "oh yes, it seems it is the transmission pressure fluid control circuit board" . I think they did not do any other checks, and went for the most expensive thing. they tried to talk me into keeping it for 4 more days while they open up the transmission and see if it is in face the circuit board or if there are other internal problems with the transmission.
the transmission shifts fine when the gear shift solenoid is not clicking when I press the brake. today i drove it and the problem never came up. it only comes up sometimes.
I am trying to find another transmission shop who could possibly be more reliable and honest.
they wanted 600$ to open up the transmission and then see what the problem is.
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post #7 of 16 (permalink) Old 04-09-2013, 10:36 AM
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Always best to use an independent mechanic/garage that has a good reputation than one of the tranny "Box Stores" who seem to live on quotas......
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post #8 of 16 (permalink) Old 04-09-2013, 04:50 PM Thread Starter
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I'm having a hard time finding online if the Transmission Fluid Pressure Position Switch Circuit is inside the actual transmission, if it needs to be opened up or not. anyone know?
thanks
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post #9 of 16 (permalink) Old 04-09-2013, 05:18 PM
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You have to remove the pan.


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post #10 of 16 (permalink) Old 04-09-2013, 05:25 PM Thread Starter
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thanks for the diagram!
unfortunately with my limited knowledge on this, does removing the pan go along with "opening up" the transmission? since the company I brought my car to said it would be 600$ just to open up the transmission, which is where the circuit board is.
I'd rather ask the stupid questions here than in the auto shop!
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