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Po748 trans harsh shifts no epc change

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How bad is it to replace epc solenoid on a 4T65-E automatic gm transmission


the side pan will have to be removed and axle shaft plus lower left side of the subframe for clearance and then remove the valve body assy ..there are several ball bearings positioned in strategic locations for pressure control that is not put back in the right position this trans will not shift correctly also when bolting the valve body back special torque sequence must be performed or the trans will still have a harsh shift . I recommend that a qualified transmission shop do the work on this trans or you are throwing away your money ...sorry

Mar 25, 2015 | 2004 Buick Rendezvous

1 Answer

My engine light is on, had it diagnosed. Can you explain F.P.C. solenoid circuit in a mazda, where is it located and cost involved to repair?


Step 1:

P1745 - Transmission system problems.

The code for this concern is related to the EPC solenoid in the transaxle.

P1745 EPC EPC solenoid circuit failure EPC solenoid, circuit or PCM shorted or open. Soft/harsh shift feel

The wire to the EPC solenoid is a yellow and violet wire.The code indicates that the problem is strictly caused by this solenoid circuit. I would suggest inspecting this wire from the trans to the PCM.If there are no obvious faults, replace the wire with a new wire ,eliminating the faulty circuit. Hope this helped you.

Step 2:

It's located inside the transmission. You must remove the pan and filter to get access to it.

Step 3:

As for the price you really need to get it diagnosed further.

Jan 27, 2013 | 2001 Ford Escort ZX2

1 Answer

When i put my car into drive it jerks forward suddenly and when i put it in reverse it jerks backward also. its never done this before


1. Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.
2. Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.
There are two thing that may be happening that you have described, but you can tell which one it will be since your driving the Blazer. Both are simple to repaire, but to change the EPC. Your going to have to drop the transmission pan so that's going to be a transmission shop and call around, the EPC can be replace the same time there draining the transmission fluid when servicing the transmission which is about $110.00 for fluid and filter replacement and additional $65.00-$80.00 for the EPC valve.
EPC (electronic pressure control) valve TPS (Throttle position sensor)
Thank you for using Fixya and good luck. If it's the EPC failure, replace as soon as possible. may casue the sunshell to fractured or splines to sheared off.

Apr 04, 2010 | 2000 Chevrolet Blazer

1 Answer

Transmission is shifting hard and slow to pull on a 95 silouette also makes clucking sounds while accelerating


Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.

Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.


Mar 05, 2010 | 2002 Oldsmobile Silhouette

1 Answer

Harsh shifting on a 4t65e trans how to repair


You can the info you need here also a little of any thing you need to know. http://aa1car.com/

Feb 28, 2010 | 2004 Buick Regal

1 Answer

My service engine light is on, I had the code checked and it said line pressure solenoid. how do I find out which one is bad and where are they located


p1745 - Transmission system problems.

The code for this concern is related to the EPC solenoid in the transaxle.

P1745 EPC EPC solenoid circuit failure EPC solenoid, circuit or PCM shorted or open. Soft/harsh shift feel

The wire to the EPC solenoid is a yellow and violet wire.The code indicates that the problem is strictly caused by this solenoid circuit. I would suggest inspecting this wire from the trans to the PCM.If there are no obvious faults, replace the wire with a new wire ,eliminating the faulty circuit. Hope this helped you.

Feb 17, 2010 | 2001 Ford Escort ZX2

1 Answer

Shifting out of first takes longer and feels rough


1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.

Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.

Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.

Visit a transmission shop and have them put a line pressure gauge on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).

Here is just a few things that are common to what you have described, I would start checking the Wire leads to the TPS and TPS it self. Good luck and keep me posted, be glad to know you got your Transmission running 100% again.

Jan 24, 2010 | 2007 Chevrolet Silverado Classic SS New...

1 Answer

2004 lincoln aviator harsh engagement and shifts


The transmission has an epc (Electronic Pressure Control) solenoid in the trans that when it looses power or fails it goes to full throttle pressure. You need to have the system scanned, check for blown fuses and have someone go into the trans information and see if the epc is getting power.

Nov 24, 2009 | 2004 Lincoln Navigator

2 Answers

96 Ford Contour CD4E Auto Trans.


The item referred to needing adjustment in the previous reply is called the MLP (manual lever position sensor). It tells the computer electronically that the car is in P, R, N, D, 2,1 (depending on the gear selector) It also allows the car to only be started in P and N for safety.
If it is out of adjustment, the sensor is misaligned with it's reference point on the gear selector rod, which goes into the trans case and pushes/pulls a rod that moves the selector piston/valve. The valve will be in the right place but the computer will say other wise and it controls the shifting with the solenoids.
SOURCE INFO:
{MLP transaxle function: determion desired gear and electronic pressure control (EPC) pressure:
Symptoms: Harsh engagements and firm shift feel, engine may not crank, may downshift to a lower gear, 2nd or 3rd gear operation, transaxle not inicating the proper gear, no 4th gear operation. no manual first gear.}
Another point of interest is the EPC (electronic pressure control)solenoid inside the black side cover.
Failed OFF-maximum EPC pressure, harsh engagements and harsh shifts.

Another possible issue may just worn out clutches if the unit has high mileage or maybe verify fluid level and recent change of fluid. The filter is inside unit and trans has to be removed to change, some Hondas are like this too.

Jul 06, 2008 | 1996 Ford Contour

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