transmission control module failing. We just replaced the computer module (pcm) 4 days ago?

ANSWER : The P0700 trouble code is a code for transmission control module (TCM) failure. Without knowing the other codes, it will not be possible to give you an accurate answer; it all depends on the other codes:

If you get a P0755 code, you may have a transmission solenoid pack issue.
P0725 indicates a likely crank position sensor issue.

I would suggest having your Check Engine Light diagnosed by a qualified mechanic.

ANSWER : Hi There,
This is a known issue in this generation Ford Focus and some Fiestas with the "Power Shift" transmission and there have been numerous recalls and lawsuits. Although, it is would be difficult to determine how much longer your transmission will last given the fact that you have many new parts, I would not recommend junking the car as it may still provide some valuable life left for you. I would recommend taking it to the dealer to see if these parts may be covered under the recall.

ANSWER : Hi there. These modules are common failures on the Jaguar XF. I am sure that this does not make you feel any better about it, but from my experience, once the modules are replaced you usually do not have any further issues, assuming that new factory modules were used. Many times these modules fail due to voltage issues in the electrical system, so it is important to always make sure that the battery and alternator are good and that all do the ground connections are clean and tight. Your car should be fine for now, but if it begins to have drivability issues, you may want to start looking to sell the car.

ANSWER : Hi there. In most cases I would agree with you to be skeptical, especially with Ford Focus transmissions as they are notorious for having major problems. However, in most cases, the symptoms you’re describing are caused by faulty actuators (on these transmissions specifically). In some cases, internal transmission problems can cause the similar symptoms, but it’s always best to complete the less labor intensive problem first as opposed to cracking open a transmission, only to find out that the external components were faulty all along. Start with this repair and see if it resolves the problem. I wish there was better advice to offer, but that’s really all that can be done.

ANSWER : Replacing the alternator does not implicate the transmission. These are completely unrelated vehicle systems. I suppose it is possible that a Mechanic could have added fluid, and to the wrong level, without your permission. Overfilling, as well as under filling, can cause problems with shifting. If it was overfilled, really only the excess would have been forced out; that is, overfilling does not necessarily cause the transmission fluid to completely empty itself out. Sometimes fluid can be forced out if the breather holes or assembly is blocked in the transmission, perhaps combined with overheating. In your present circumstance, the best thing to do is first clean up as much of the mess as possible, so you don’t have burning fluid under the hood and also to make it easier to inspect the issue. Then, check the fluid level, using the right procedure, and see where you are. If the fluid level is OK at the moment, try operating the vehicle and see if the issue recurs. If you still have a leak, obviously it will have to be tracked down and, as noted, the possibility of the breather being obstructed has to be considered. If you do suspect a leak, I recommend you request a transmission leak diagnostic which will provide a resolution of this issue for you.

ANSWER : I would ask the mechanic for the exact part number of the electronic component that he believes has failed. Or, at least have him "name" the part and indicate where in the column assembly the part resides. The steering column is made up of many parts, most of which are separately serviceable. As discussed below, limp mode (reduced power) has many, many causes. Consequently I would also ask the mechanic to explain to you EXACTLY how he arrived at his diagnosis and ALSO have him show you the exact test results, on a diagnostic tool, multi-meter, or scope, that has led him to conclude that the particular "module" has to be replaced. With no evidence and no intelligible confirmation you would be taking a risk.

YourMechanic does offer a reduced power (limp mode) diagnostic. If you request a reduced engine power diagnostic the responding certified mechanic will give you confirmation of the cause of the issue in your case. Typically, a vehicle’s powertrain control module (PCM) will have stored one or more diagnostic trouble codes that will identify the "general area" in which the fault lies in the engine management controls. Although the throttle control system is a common trouble area with reduced power, there are quite a few other components and systems that could come into play and, of course, there is always the possibility of multiple, or "coincident", faults. Here are some of the possibilities that YourMechanic dispatched technicians would consider:

Defective throttle position (TP) sensor
Defective oxygen sensor
Defective accelerator pedal position (APP) sensor
Loose or damaged wiring
Defective throttle body
Defective powertrain control module (PCM) (not typical; ONLY if a long, long list of other possibilities is ruled out)
Any fault/error that will affect drivability function
Any fault/error that will affect vehicle performance
A fault/error in the emissions system
A fault/error in the throttle control system
A fault/error in the transmission control system

If you request the recommended diagnostic the mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : You’re getting into an area that is kind of a dark art when you’re getting these kinds of codes. While I don’t know any of the symptoms that the car is exhibiting, I can tell you that failure in one of the control units can lead to codes showing up in the others and the ABS, ESP is a likely culprit since it interprets the wheel speed signals and sends the information to the other modules. You’re right that the module has to be coded, and I don’t think that Snap On has the software for that so the only place to go is the Star Diagnostic. (The consumer version of the Mercedes SDS ) You can Contact YourMechanic and see if anyone in your area has the appropriate equipment for this. Otherwise, this may be a case that would best be consigned to the Mercedes Dealer.

ANSWER : Hello. It is possible that the part is defective, but most of the time this is because the computer has to relearn the new idle control valve. Sometimes, this can take a little while before it works correctly. It is also important to make sure that the throttle body is clean when the idle control valve is replaced, as a dirty throttle body can also cause this.

I will usually clean that first and then proceed to checking the idle control valve to see if it is defective. If you want to have this idling problem checked out, consider having a certified mechanic, such as one from YourMechanic, come to your location to determine why the car is idling improperly.