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Help! With Diagnostic Code

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
I need help with a Diagnostic Code.
While driving today I made a Rapid slowdown into a left turn. An Active Handling Code and Warning Symbol appeared. The car drove normally and when I arrived home I did a Code Search which turned up a
"28TCS C1292HC" code. I attempted to clear it and it returned immediately.I did this a couple of times. I even checked the brake fluid level at a suggestion, right at level.
I have searched the GM Service Manual and cannot find that Code listed. My car is a 1999 FRC with Active Handling (JL4)
Anybody have any ideas??
Barrier
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
Code C1292 is a fault in the Master cylinder pressure sensor circuit.
http://www.corvettedoctor.com/2004_DTC_Codes_Page2.html
The HC means that it is stored as a History code and a Current code,
which tells you that it has happened before and is currently faulting.

I would contact the dealer and see if the sensor is a separate replaceable component.
I can't tell you any more that that, unfortunately.
 

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
Thanks for the response.
Anybody have any information on this?
I notice no Brake problems.
Does this imply a Master Cylinder problem?
Barrier
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
Yes, it is a master cylinder problem. Or rather on the sensor on the master cylinder.
It probably means that the sensor is over or under the normal output range, either from a bad sensor or a loose or wet connection.
You probably won't notice any problems until the Traction Control System kicks in.
 

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
Does anybody know where this Pressure Sensor connector is?
Perhaps I could check the Connection. I did pull the connector at the side of the Master. I think that was only a level sensor.
Barrier
 

Jistari

Well-known member
Joined
Aug 30, 2006
Messages
254
Location
New York
Corvette
2001 Black on Black A4 Coupe
LOL I just wrote up this exact problem with pics, I'll start another post and see if we can get some more help there.
 

c4c5specialist

Technical Advisor
Joined
May 29, 2001
Messages
3,682
Location
New Haven, Ct. USA
Corvette
Nope, but someday.
I need help with a Diagnostic Code.
While driving today I made a Rapid slowdown into a left turn. An Active Handling Code and Warning Symbol appeared. The car drove normally and when I arrived home I did a Code Search which turned up a
"28TCS C1292HC" code. I attempted to clear it and it returned immediately.I did this a couple of times. I even checked the brake fluid level at a suggestion, right at level.
I have searched the GM Service Manual and cannot find that Code listed. My car is a 1999 FRC with Active Handling (JL4)
Anybody have any ideas??
Barrier
HI there,
Essentially, this code is telling you that when you were slowing down, the ABS computer did NOT see a building of pressure in the braking system.
Now, in the picture below, you can see that your sensor is located in the combination/proportioning valve below the master cylinder.
You can check to make sure that the sensor is connected, and that the wiring is not contaminated with moisture or rubbed through. Other than that, replacing this sensor usually will repair the condition, UNLESS you were down shifting and did NOT press the brake pedal.
Allthebest, c4c5
 

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
I want to thank everybody for the help. I tried clearing the codes again and it cleared. I arranged for an appointment when and if it returns (I'm pretty sure it will). I have the GMPP and it is covered so might as well.
C4-C5 Specialist I think you nailed it, if It wasn't covered I would just go with your suggestion.
Barrier
 

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
Active Handling Problem C1292 Code

An update on this code and problem.
I brought my car in and parts are being ordered ( nothing definitive was found just some volt spikes? I think the pressure diff assem was ordered).
I have been driving the car and now I'm getting some problems. When the Service active Handling light comes on ( I clear the codes to shut the annoying symbol off), I am now feeling the brake pedal kind of sink soft feeling, if I try to clear the code it won't clear. If I pump the brake pedal a couple of times the pedal hardens up to normal and code will clear. The car will drive fine sometimes for a day sometimes only a mile or so. Braking hard seems to cause it. I never seem to loose any stopping power.
Does this sound like a Master Cylinder problem, Sensor or Pressure Differential problem?
Sure am happy I have the GMPP.
Anybody with ideas??
Barrier
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
A way to test the master cylinder is to very lightly apply the brakes while standing still. If the O-rings in the cylinder are leaking the pedal will slowly start to sink to the floor. If you press harder, it will stop.
 

Barrier

Well-known member
Joined
Aug 14, 2001
Messages
104
Location
Lido Beach,New York
Corvette
1993 Convertible 1999 FRC Pewter sold
No, it's does not seem to be doing that. I have a hard pedal then after the Service active handling light goes on thats when the pedal sinks and gets soft. If I press the pedal acouple of times it hardens up and is fine til it happens again.
Barrier
 

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