Hello all. About 4 months ago my 2012 nissan frontier pro-4x automatic went into limp mode. Truck had about 75000 miles. Stuck in 2nd gear, no reverse. Got home, checked with a code reader and found the p1774 code, low coast brake solenoid. Cleared the code, drove to the store and it happened again as i pulled into the parking lot. On way home, it did it again. I would be cruising along, the trans shifts hard and the check engine light pops up.
assuming it was a solenoid flaking out, i pulled the valve body and replaced the solenoids. New filter while i was in there. New fluid. Went on many short drives with no prob. It went back into daily use. Well with working from home, i only put 1500 miles on it in the last 4 months. No errors again until monday. Same thing, p1774 error. The solenoids were replaced with exact factory replacements when i did it months ago. The pins for the valve body computer had good continuity. Older models would break a lead and cause the issue. Not this one.
I drove the truck about 40 minutes today, no issues. Anyone got any ideas? Last thing i want to do is have to take it in for a shop to work on. From what i read online, they will just want to replace the trans and that should not be necessary.
I wonder if the valve it activates is sticking in the bore and not returning.
It could be the ATF Pressure Switch 2, it monitors if the coast solenoid is working.
Downlod the FSM here:
https://www.nicoclub.com/archives/use-nicoclub-coms-factory-service-manual-database.html
Awesome, thanks.
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