Q: Tranny erratic shift if the problem is in the tcm would it throw a faulty tcm code ?or not all the times this happens.

asked by on

2007 dakota v6 tranny 42rle erratically shifting replaced hidraulic fluid ,new filter ,mechanic replaced pressure shifting selenoid ,problem did not go away ,then replaced pack selenoid problem continues erratic shifting most of the times tranny locks in limp mode besides all of mentioned truck runs fine ,no hesitation engine runs smooth mechanic said 2 codes come up when hook up scanner p0760 , indicating a fault on the shift selenoid "c"the other code is p0870 hydraulic pressure line malfunction he has said to me that he is not to expert on the electric tranny areas but he estimates the problem is bad ground circuit or the tcm itself on the most part . please tell me your opinion ,truck has 120000 miles ,and ive aready spent 579.00 dlls.on this guy and i can not afford to throw more money away.please help thanks.

My car has 120000 miles.
My car has an automatic transmission.

Hello and thank you for contacting Your Mechanic. The code P0760 means that the shift solenoid "C" is operating irregularity. The code P0870 means that the transmission fluid pressure is not determined at its specified pressure.

Check the harness to the transmission and make sure that everything is plugged in. Check the main harness for corrosion and any debris on the contacts. If the harness checks out to be okay, then the problem lies within the transmission. The shift solenoid "C" is probably getting too hot and shutting down. The pump pressure solenoid is not functioning correctly and is maxing out the oil pressure causing harsh shifting.

I recommend replacing the shift solenoid "C" and the pump pressure solenoid. If the problem continues to persist, then the transmission oil temperature sensor could be failing. This symptom results in low fluid, failed pump, slipping transmission, or the computer has lost its memory and needs flashed or replaced. However, I suggest replacing the shift solenoid "C" and the pump pressure solenoid first before doing anything else.

To avoid anymore unnecessary repairs, consider having one of our mobile technicians help you properly diagnose your transmission erratic shift issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Tranny erratic shift if the problem is in the tcm would it throw a faulty tcm code ?or not all the times this happens.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine knock noise after changine alternator was replaced

Depending on the type of engine knock, this may simply be related to what is called "spark knock" which is a result of detonation due to using less than optimum octane fuel. A "spark knock" is the result of combustion...

Q: Q: Stalling in any gear

Quite a few faults can cause the vehicle to stall and not be able to run properly. The most common problems is a failure with the fuel pump, alternator, fuel filter, MAF sensor, vacuum leak, or exhaust leak. I'd suggest...

Q: Q: My '98 expedition, it drives fine for a while, then after a few hours, when sitting still, it idles rough then shuts off.

After some testing done to verify the EGR valve flow to see if the valve is intermittently sticking open causing the stall. This can be done using a scanner with the capability to open and close the EGR valve and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...