2005 limp mode, codes p0507, p2104, p2106

[biddle]

Lesson learned. I relied too much on their great reputation and accepted their estimate without waiting to hear from other owners. I have learned my lesson. In the future, I will get the estimate and research it before agreeing to anything.

Write a Google review and Yelp! This is what impacts them the most! What are their reviews on Google?

A big problem with Mechanic referrals is lots of people are just happy the car got fixed and they have no idea they got screwed! My video on Christian Brothers Automotive is a good example. Had I accepted the estimate and let them replace my A/C compressor, I could have very well walked away happy and wrote them a good review. Unfortunately for them, I took the car somewhere else and found out my compressor worked fine and it was just a ~45.00 return line that was cracked instead of an 1800.00 repair!

Consumers are now protected when they write reviews- https://www.ftc.gov/business-guidan...review-fairness-act-what-businesses-need-know

I am really curious if the codes come back again! My guess is they will!

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[Marianne]

I have replaced all the coils one at a time between 2016- 2021. Now my car is idling very rough and the wrench light and check engine lights are both on.
The mechanic is thinking either replace all 8 coils and spark plugs or replace throttle body.
Do coils fail after only a few years?
I would appreciate any advice you have. Thanks

 

[biddle]

Now my car is idling very rough and the wrench light and check engine lights are both on.
Do coils fail after only a few years?

First, you need to get your own Code Reader so you know why your check engine light is on. Otherwise you are just spinning your wheel asking the internet to make recommendations. Get the Blue Driver, it's the easiest to understand and use- https://forums.fordthunderbirdforum...r-2002-2003-2004-2005-ford-thunderbirds.9738/

Secondly, it does not matter if coils can fail after a few years, etc. It only matters if yours has failed. It's not hard for a mechanic to determine this and examine your spark plugs.

Read this thread about COPS- https://forums.fordthunderbirdforum...-05-ford-thunderbird-ignition-coils-cop.5040/

You will note that it says- Important- You may also have a problem with your cowl seal, wiper seal or valve cover gasket, which is causing the coils to fail! You can read more about that in this post. If you have coils problems after a few days/weeks/months it's likely not the coil, but an additional problem.

 

[Marianne]

Doug and Biddle, Here I am, a year and a half later. More problems, some same codes, some new.
My 2005 Bird was running well until 2 weeks ago. I went to turn on the engine and it immediately went into limp mode.
Codes are P061B, P2106, P2104, P0600.
Originally, the mechanic said I needed a new Throttle body, but that didnt fix it. So they put my old throttle body back, then retested all the coils, which were all replaced last January 2023. All coils are ok. Now he says I need a new PCM. I asked if it was the TPS but he said it was not. A PCM will cost $3,000 after diagnosis, part, update software.
I have 2 questions:
Is the PCM often the cause for these codes?
If I went to them with these codes in Jan 23 (see above), can this be considered under warranty?
Thanks for any advice. I love my Thunderbird but I cant afford all these repairs.

Another question:
- I found a video in this forum about a faulty component in the electrical wiring that makes me wonder if my Bird may have an electrical fault. It started with my A/C and I had to get a new ac compressor but now this may be connected to the throttle body? How many mechanics are as talented in the complicated electronics of these Birds as the man in that video?
Thanks for any advice.

 

[doug7740]

Marianne,

Since I’m not there working on your car or working with the technician who is, makes it hard for me to understand how the technician determined that you needed a throttle body and now a PCM. Also, Why did you have the compressor, condenser and DCCV replaced? From what you are telling me it seems like the technician misdiagnosed the cause of the problem and is just throwing parts at it with hopes that it will fix the problem. When I worked at the dealership if I misdiagnosed a vehicle I didn’t charge the customer for any further diagnosis. With that said let’s take a look at your new codes P061B and P0600.

P0600 is a Serial Communication Link Malfunction and the possible cause is a damaged PCM.
P061B indicates a calculation error has occurred in the PCM.

Since code P061B is set in combination with P2106, we have to check the possible causes for code P2106. Looking at Technical Service Bulletins I found TSB 05-14-4. According to the TSB it states that after replacing the throttle position sensor you must reprogram the PCM to the latest calibration release of B36.11 and higher, or B37.2 and higher. Since you had the throttle body replaced and the throttle position sensor is part of the new throttle body, did the technician repairing you vehicle recalibrate the PCM to the latest calibration? I’m sure a new PCM will have the latest calibration, but maybe all you need is to have your current PCM recalibrated.

Since you told me in a private message that when you asked the technician working on you vehicle if faulty electrical wiring could be the problem and he said that a new PCM will fix any bad wiring, I think it’s time that you take your vehicle to a different repair facility.

doug7740
1955 Thunderbird Blue