F45 and F55 are a bit different.... I took it in and had the F45 RPO code removed for very little. The problem with F55 is that it's an integrated system, so even though I was able to get around the "Shocks Inoperative, Service Ride Control", it still stays in limp mode without throwing any codes. I've done some pretty thorough searches for information on disabling F55, but there just doesn't seem to be any out there. If this guy wants to charge a premium for knowledge nobody else has, then so be it. Supply and demand.

 

I'd like to hear a better "explanation" of why this is so complicated and what three computers are involved ......

I'm "suspicious" because GM offers a kit to upgrade an F45 system to an F55 system ...... go to this site and enter part number 12499507

http://www.gmpartsdirect.com/

No reprogramming of ANY computers .... you install the new ESC computer and the new shocks and you are DONE ........

The F45 and F55 systems are virtually identical to the other computers in the car. It's why Chevy was able to put the F55 into the C5, even though it (F55) was originally designed for the C6. The computer (ESC) for the F55 system is much more powerful (faster) than the F45 ESC ... and the F55 shocks can respond faster than the F45 shocks, but the rest of the system is the same .....

IMHO you are being fed when someone claims multiple computers have to be re-programmed ...... hang in there .... we'll get this fixed .... the 80 MPH limit hopefully isn't a problem in the short term (you aren't planning on trying to outrun the CHP anytime in the near future ???? .... )

We'll get you fixed ..... don't go wasting money on claimed fixes that seem very suspicious ....

 

did u try putting resistors where the shocks used to connect to the harness? it worked for me for over 2 years...

 

There were a set of resistors in it, but the right side had fried. I was thinking about making my own, but I'm not sure what wattage they need to be. The side that works is 12-13ohms of resistance, ??? watts.

 

You CAN DELETE the F45 from E2001 cars, I DID it using a Tech2 on 'Fastbird93' 1999 coupe during an APS TT install

95% of the time I post from actual experience, reading the forum only takes you so far, I'm from Missouri, "Show Me"

 

My car is a 2004. 2003 and 2004 are the oddballs with F55.

 

Steve,

Go to the previous page and read posts 10, 11, and 12 ......

Mea Culpa ....

 

I was hungry , it was before dinner and I saw info that was inac., had to jump on it before reading the entire post

 

Like it was the first time I ever jumped on a thread without reading the whole thing .....

My mistake created the issue .... you're forgiven ....

Again, my mistake, mea culpa, .......

 

So, I went ahead and installed some Radio Shack 10ohm/10watt resistors on the right side and hooked the module back up. Everything went fine for about 15 minutes, then the shock simulators on the left side blew up. So, I replaced them with Radio Shack resistors (I bought 4 yesterday). Now, I can drive the car for 15-20 minutes before it throws a code. I soldered bullet connectors on the resistors so I could easily remove them to test the resistance. Looks like they are sitting right at 10ohms. They aren't blowing up, but maybe overheating? The last time it switched to limp mode after 15 minutes or so without throwing any DTC's. Same behavior as removing the RPO code and unplugging the ride controller, just takes longer for it to happen. I've had it with this stupid limp mode. I want the F-55 to go away and never come back.

 

ttt

 

You can't? Strange, I have a 1997 Coupe with the F45 option, and I removed the RTD Module, then removed the F45 shocks and replaced them with C6 Z06 shocks, then limped it (under 80) to the dealer where we removed the RPO from the BCM, and viola, F45 removed, no 80MPH limit, no codes, and when I check for codes it says "RTD - No Comm" which is the same that it says for "SCM No Comm" (Because those options aren't installed, it doesn't care...

You can removed F45 from an older C5...

And yes - you must Completely remove the module from the car - DO NOT hook it back up -the ECU will automatically reinstall the RPO... Completely remove the Module, then turn off the car, and follow the correct process for deleting the RPO..

Edit: I see someone already informed BlackZ06 about the misinformation - sorry for doubling up... hehe

-Dan

 

After some experimentation, I found that it goes into "codeless limp mode" the second I take a tight corner or under brisk acceleration. I'm thinking maybe some sensor or another that's expecting some kind of response through the ESC?

 

ttt

Is Bill back yet? This is killing me. If I can't get this fixed in a very short order, I'll have to return the car to the dealer and try to find another one. I was given one month to bring it back, and I've been three weeks now. I've even left a VM for the engineer who designed the system to try to get some answers.

 

Yes,,,Bill is back. Man,,,what a friggen month Ive had!
My son ran off the road and ran over a curb head on and All four of my CCW 505A's are BENT ,,my car needs a clutch, my 71 popped a caliper, my F150 blew a brake line, my jeeps CAT blew a hole in the case and the headers fo my C6 will be here in a few days!

So,,,Ive been busy!

Here are the schematics you all have been waiting for:



I also found this special programming procedure:

Service Programming System (SPS)
For step by step programming instructions, please refer to the techline information system (TIS) terminal.

Review the information below to ensure proper programming protocol.


Important
Do NOT program a control module unless you are directed by a service procedure or you are directed by a General Motors Corporation service bulletin. Programming a control module at any other time will not permanently correct a customers concern.

It is essential that the tech 2 and the TIS terminal are both equipped with the latest software before performing Service Programming System (SPS).

Some modules will require additional programming/setup events performed before or after programming:

Review the appropriate service information for these procedures.


Ensure the following conditions are met before programming a control module:

Vehicle system voltage
There is not a charging system concern. All charging system concerns must be repaired before programming a control module.
Battery voltage is greater than 12 volts but less than 16 volts. The battery must be charged before programming the control module if the battery voltage is low.
A battery charger is NOT connected to the vehicle's battery. Incorrect system voltage or voltage fluctuations from a battery charger, may cause programming failure or control module damage.
Turn OFF or disable any system that may put a load on the vehicle's battery, such as the following components:
Twilight sentinel
Interior lights
Daytime running lights (DRL)--Applying the parking brake, on most vehicles, disables the DRL system. Refer to the Owners manual.
Heating, ventilation, and air conditioning (HVAC) systems
Engine cooling fans, radio, etc.
The ignition switch must be in the proper position. The tech 2 prompts you to turn ON the ignition, with the engine OFF. Do NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.
This module requires a special tool to successfully complete SPS. Refer to Special Tools .
Make certain all tool connections are secure, including the following components and circuits:
The control module serial data link tester
The RS-232 communication cable port
The connection at the data link connector (DLC)
The voltage supply circuits
DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.
DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.


The F-55 controller gets input from the Steering Wheel Position sensor, the PCM and it connects to the serial buss data link.

I dont see why the EBCM goes to NO COMM. unless the module is programmed to shut down if it looses the ECS module.
Looks like the connector that you need to have connected is P-401

Have you tried to delete the F-55 RPO with P401 connected?? The F55 module may be the exception to the TOTALY disconnect the module.

 

Ouch! So sorry about your mishaps! Not the best vacation. Hope it all comes together quickly and easily for you. If anyone deserves some good karma, it's you.

Thanks so much for your help.

 

So, the deed is finally done. I took the car to Regis at Corvette Specialty of California (http://www.corvettespecialty.com/wwwstore/) who knew exactly what to do. He unplugged the ESC, then downloaded new programming from GM and reflashed the BCM, EBCM, TCS, and PCM. Start to finish took several hours.

It was a heckuva day. I left my house at 5:30am, and got to Riverside right about 10:00. They were finished at 6:00pm. I got home at 10:30pm. 24 miles of the trip took me 1 hour in LA traffic. Someone please tell me why anyone wants to live in the LA area again?

In all, I was super impressed with Regis and Corvette Specialty. Their facility is HUGE, and they have and do everything Corvette. Sales to parts, to service... even a body shop that does nothing but Corvettes. I think there were 130 cars there yesterday.

So, the final word is, if someone wants to sell you a car with F55... run screaming.

 

WOW,,,,well done! I had NO idea that the EBTCM could be programmed! Still want to drive her off a cliff??

I wanted to BURN my 98 until I figured out my problems were caused by bad grounds. Then it drove like a new car again!

Bill

 

Well, I'm in love with the car now, but if I ever catch a whiff of F55 again...