So I've got the dreaded CEL and OD blink which happened at the same time. I did a search but it seems that for every post, there's a different cause. My engine (2000 5.4L) does develop a miss as you open the throttle from idle. So I'm thinking maybe there's a vacuum line that goes to the transmission that's failed? Or, because the engine has a miss and can't really reach good RPMs, that's cause the tranny to mis-shift? If there is an engine-to-transmission vacuum line, where should I be looking for it? Any other suggestions?

Thanks,
Pat.

 

Sorry, I can't directly answer your quesitons, but, as I'm sure you probably already know, a code will be sent to the computer from the sensor that triggered it...... It's meant to point you directly to the problem...... The catch to this is that you need a code reader... Not a cheap item. You can go to a dealer to get the code read, but that's not too cheap either....

If you happen to have a Auto Zone or other popular Auto Parts store, they will read codes for you FOR FREE, but won't be able to provide much diagnosis. They might be able to translate the code in order to "sell" you a new part, but that's about it....

I'm not aware of any vacuum lines to these new trannys.... They are all electronic and the computer controls most, if not all of what they do....

There are a 'zillion' sensors and other things that can trigger the lights...... Only way to know exactly is to get the code read....

Good luck!

Mitch

 

OK, I pulled the codes:

• P1747 - Pressure Control Solenoid A Stuck On
• P0750 - Shift Solenoid A Malfunction
• P0755 - Shift Solenoid B Malfunction
• P0743 - Torque Converter Clutch Circuit Electrical
• P0443 - Evaporative Emission Control System Purge Control Valve Circuit Malfunction
• P1451 - Evaporative Emission Control System Pressure Sensor Range/Performance
• P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
• P0155 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
• P1409 - Exhaust Gas Recirculation Sensor A Circuit

Pretty sure that some of them are triggered by others. The three "enhanced" codes (begins with '1') I couldn't find specific explanations for, but I assume they are covered by the generalized (begins with '0') descriptions, is that right? Also, it could be that some of these codes weren't cleared previously and aren't even part of my current adventure.

So to summarize, it looks to be shift solenoid or torque converter and/or emissions equipment. It's hard to believe that they both failed at the same time!?

If anyone has some amazing advice, I'd love to hear it! Otherwise, I'll have to decide where to take it. Prolly not the dealer .

Pat.

 

Re-set your PCM.

 

Wow, that's a lot of codes!!

Humm... Might be a good idea to try what hcmq suggested and just reset the computer and run it and see what pops up again.

Does the trans seem to be shifting funny or feel like it's slipping?

If the lights pop up again, then I'd take it in. Make sure you find a place that can diagnose what the codes really mean in order to fix the problem the first time.... They might just throw parts at it and charge you for those parts and it won't solve the problem!

Those trans codes sound a bit 'scary', but I would think you would be able to tell if the trans was not right...

Good luck!

Mitch

 

OK, I reset the pcm, made sure it was clear then started it, shut down and re-read the codes. All of them reappeared except P0750, and that was just sitting there in park. I put the truck on the hook and took it to a shop.

We'll see.

Pat.

 

So, I heard back from the shop and they're thinking it's the pcm itself, because it's throwing so many seemingly unrelated codes. Makes sense. That's as far as they're willing to go, though. Is there any way to test the module itself? If it requires replacement, about how much should I expect to spend? Are there any alternatives to buying it from the dealer?

Thanks,
Pat.

 

ONEAL,

I know it's a little late now that the truck is on the hook(or has been). But that sure sounds like a wiring harness problem in the cpu circiut. Maybe the harness is schafing on some bracket or metal piece (I remember some thread about K&N's airfilter rubbing on the harness and shorting the cpu out)

Just seems that clearing the codes and restarting the truck for that short of time "all of those sensors" were pretty busy to throw that many codes. I guess we'll see!

Please keep us posted, this is a good one for mind-benders!

Gene


I see you posted back before my reply.
Keep us updated

 

The technician I spoke to also had that idea, Gene. I suppose it's possible and might be easier (cheaper) to fix than replacing the pcm. Sadly, I don't think I have an alternative to taking it to the $$$ dealer $$$.

Pat.

 

OK, the truck's at the dealer (Chino Hills Ford), preparing K-Y Jelly now .

In the somewhat likely event that the diagnosis will be "need a new tranny", rather than actually doing that, I'd think a better alternative would be to take it to a tranny shop that can rebuild it better than new, especially for towing, which is what this truck's primary responsibility is.

Does anyone have a recommendation for a shop that they trust in the southern California area, preferably Inland Empire?

Thanks,
Pat.

 

RESOLVED

The O2 sensor shorted out, blowing one of the main fuses and damaging some wiring. New O2 sensor, new fuse and wiring repair/replace: $368. I feel :o for shelling out that much for an O2 sensor, but I'd still owe them $75 for diagnosis so what the heck.

Could have been worse!

Thanks for everyone's help,
Pat.

 

That's great that they were able to diagnose it and resolve the problem.... Yeah, it sucks to have to shell out that kinda cash for what seems like not a whole lot of stuff, but I always look at how long would it have taken ME to figure it out???

I would have never been able to figure that out.... Don't have the proper tools and would not even know where to start!

Besides, figure how much time I would have had to take off of work, or miss work, or rent a car to get to work, and what the dealer charged is nothing compared to all that!

I'll bet it was the top one on the pass side...... The reason, the A/C condensor or whatever drips right around that area! When mine has been on, it can hear it sizzle as it hits the exhaust pipe on that side! I just hope it ain't dripping on the sensor! might have to check that out!

Thanks for all the updates! Wish more would do that.....

Mitch

 

Wait a minute... NOT SO FAST THERE, SPARKY...

I went to pick up the truck and the CEL was still on . I had to leave it there so they can check it tomorrow.

Pat

 

So, I'm looking at the repair order from yesterday... $118 for the O2 sensor and $237 in labor??? 3 hours to R&R an O2 sensor? Anyone that's done this job, does this sound reasonable?

Pat.

 

Drivers side= 10 minutes tops
Passenger side = 30 minutes, it hard to get to, sometimes you have to pull the tire and go thru the fender well.

I'd be interested in what the book recomends for labor?

Did they do the towing and dianostic work also, then maybe its not so bad!

Gene

Has this fixed it?
Can't believe a shorted 02 sensor thru the codes about the transmission!