Tuesday I got the error message: SERVICE TRACTION CONTROL/REDUCED ENGINE POWER (at about 70mph on the freeway). I was instructed to pull over by Onstar, shut down, and re-start. After doing so, the DIC cleared and I was able to drive normally, but still had the engine icon illuminated. I parked and had a cup of coffee, and when I started up again the engine icon was clear. Tonite (Saturday) I got the same problem pulling out of my parking lot, at about 7 mph! I got it started, drove to a diner and after dinner, engine icon clear and business as usual. I'm going to take it in this week. Anyone else have this happen with thier C6? If so, what was the problem? Bad sensor? Which sensor(s)? HELP!!!

 

Mine did that and after a week at the dealer, they said there was nothing wrong! But now that GM has agreed to replace the car, for that other reasons, the problem and the car have gone away.

 

What other issues did you have?

 

The oil line came off of the cooler (not properly installed at the factory) and soaked the engine compartment with oil on the way home from picking the car up that I waited 2 months to get. This screwed up most of the electronics under the hood. One issue that caused many problems. Also had a pinched wire going to the starter that caused two no starts.

Fine UAW labor.......

 

Same problem here and it gets progressively worse, just as you said... I've replaced the steering position sensor, and map sensor (dealer recommended) still same code...We've been working hard on this one... It's hard to go from 620rwhp to 100rwhp...I'll keep you informed of my findings...
Jeremy

 

Which DTC is it showing?

 

Don't laugh, but check you electrical connections for moisture or oil contamination.

 

my o5 a4 has this problem every time ifloor it right before second gear shift but only when rain after it stops or when i wash car low coolant sensor replaced steering sensor replaced massair flow sensor replaced abs module replaced if i take out on sunny days only dont wash never happens

 

Have your dealer look up this bulletin.

"Corporate Bulletin Number 06-02-35-002 is currently available in SI.

Diagnostic Trouble Code (DTC) C0710 Steering Wheel Position Sensor (SWPS) Signal, Service Stability System Message on Driver Information Center (DIC) (Inspect and Secure Wires in SWPS Connector)"

 

did that 3 times some say crank trigger bad some say tach to slow dealer says abs computer not communacating with main computer keep dry never happens but as long as their ai a chance no nos

 

Did they replace the sensor or perform the steps below?

"Condition
Some customers may comment on a Service Stability Message on the DIC.
Diagnosis with a scan tool may reveal a DTC C0710.

Cause
The most likely cause of a DTC C0710 on a vehicle equipped with power telescoping/tilt steering wheel is high resistance in SWPS connector C202. Fretting terminal corrosion may be present in the SWPS connector due to the telescoping motion of the steering column. When the steering column is telescoped in and out, the female terminals within the SWPS connector may move on the male terminals of the SWPS. This movement between the terminals may cause a high resistance condition in the SWPS connector.


Correction
1. Remove the driver's side close out panel.
• Cadillac XLR — Refer to Closeout/Insulator Panel Replacement - Left (SI Document ID 1207847)
• Chevrolet Corvette — Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower (SI Document ID♦1495116)

2. On XLR models only, locate and remove the plastic strap (1) on the steering column harness that retains the three wiring harnesses. Discard this strap.
3. Disconnect the SWPS connector C202 located on the lower center of the steering column.

Important:
Failure to properly tape the wires in the connector may result in additional concerns.
Failure to use a small plastic strap 2.5-3.5♦mm (0.10-0.14♦in) in width may prevent the SWPS connector from properly seating, resulting in additional SWPS DTCs.
Failure to position the plastic strap in the connector notch shown below may result in the strap becoming loose and allowing the terminal to move within the connector.

4. Using electrical tape (1), tape from the plastic strap up the wires a minimum of 2.5 cm (1 in).
5. Install a small plastic strap (2) 2.5-3.5♦mm (0.10-0.14♦in) wide around the SWPS sensor connector so that it retains the wires to the connector as shown.

Important: Install and remove the SWPS connector a minimum of three times to remove any possible terminal corrosion.
6. Reinstall the SWPS connector.
7. Reinstall the close out panel.
• Cadillac XLR — Refer to Closeout/Insulator Panel Replacement - Left (SI Document ID 1207847)
• Chevrolet Corvette — Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower (SI Document ID♦1495116)
8. Clear the DTC with a scan tool and road test the vehicle.
9. If DTC C0710 resets during the road test refer to:
• Cadillac XLR — DTC C0710 (SI Document ID♦1399468)
• Chevrolet Corvette — DTC C0710 (SI Document ID♦1460425)"

 

I would imagine that if yours shows up when washing you might want to check the wheel sensor connection.

 

Thanks for the info guys... My dealer won't touch mine because of the supercharger and other mods... They'll NEVER get my business again... Tried another dealer, got treated the same way... 21st Century Muscle Cars has done all of the work on the car, and on this issue they have done the work for FREE... They obviously understand customer service...
Jeremy

 

I'm getting way off topic here but isn't 21st Century a GM warranty center now for Corvettes? I seem to remember a post about this in the past.

 

Welcome to my world, and what a major PITA it is.

So far, they've replaced the main wiring harness 3 times and the ECM twice and the accel pedal once. They think that they have it fixed. I've been burned too many times to ever think that.

Major, major electrical glitches, primarily centered around the Service Traction System and Reduced Engine Power messages. Other goodies that the bitch did to me include improperly doing corrections during AH/TCS events which nearly caused me to wreck on multiple occassions, and opening the passenger door while driving to the office one day.

Most of my story is listed here http://forums.corvetteforum.com/show..._id=101&arch=1 but since then it has spent at least 2 more weeks in the shop for another main wiring harness change, erratic fuel gauge, and grinding noise from the diff gear.

 

i forgot all this only happens when i have traction and active handling off thats when i get service traction control

 

Bad Dealer....Bad Dealer....

The steering wheel sensor would cause the code listed above and would turn off active handling, but would not cause reduced power mode. Stupid! Stupid!

I'd go somewhere else if it happens again, most likely its your pedal, throttle body, or the wiring between them...

try to get codes they pulled.

 

Yes but only for the purchased "extended" warranty (don't know the name of the warranty)...
Jeremy

 

voltage out of tolerance condition on the 5-volt reference circuit is what mine shows on the tech 2...It also throws several BCM codes that will not clear with a simple battery disconnect. The symptoms start under hard excelloration and get progressively worse 4000rpm, 3000rpm, 2000rpm, etc. until just backing out of the garage throws the code... all resulting in "reduced power mode"+"service active handeling"+"service traction control"...
Jeremy
Once again THANKS soooo much for the shared knowledge...

 

BCM and many other modlues codes no longer clear with battery disconnect (or touching terminals), they must be cleared with scan tool. A problem on the 5 volt reference would mess up a lot of systems. Basically, the modules send out shared 5 volts and grounds to sensors, sensors report back between 0-5 volts depending on what they sense (Actually, they usually buffer it a little bit, range could be 0-5 volts but they usually go .5v to 4.5v).

There are several of these 5 volts sources, the steering postion sensor shares the same 5 V refererence as the brake pressure sensor and the yaw sensor. It originates at the abs module and runs through the underhood fuse box then off to the difference sensors. But, a failure on this line should only affect active handling/abs type stuff, not reduced power mode.

Does it do it all the time or is it intermittant? If it does it all the time, be careful not to pull on wire or change anything because you want to figure out what is causing it. Once it is happening, look at the Tech II data and see which sensors are getting bad 5 volt reference, then use a multimeter to double check they are not 5V. Next you need to follow them wires back to there source and determine if the module isn't putting out the proper voltage (less likely) or find the wriing problem (more likely). You could have pinched wires, a short, whatever, hopefully they have a schematic. In the case mention above with the steering position sensor, they could test at steering position sensor, then disconnect connector at underhood fuse box and test there, hopefully they will find your problem that way.

**very important, if your battery died it is possible for many 5v ref codes to set that will mislead you. You need to see what codes are active and what codes are history, focus on active codes....

Good Luck