Hey guys,

Just got my vette (05 Z51 Vert 6-speed 23K miles) and the check engine light came on shortly after getting the car (it was after I filled gas so I didnt make a big deal of it). Anyway, the Infiniti dealer I got the car from pulled the code (P0833 Switch B Circuit, also B2AAA, B2A00). I was told the P0833 is because the clutch was being ridden to hard. Is this possible?? I've barely been on the clutch so??

Anyway, as soon as the codes were reset I went to get the car inspected and I failed for an OBD "oxygen sensor." The guy at the inspection center asked me If the car was jumpstarted or the battery died because "not everything reset." He said the car just needs to get driven 100 miles for everything to reset. He then joked that he would gladly take the vette for a 100 mile ride Does this make sense to anyone???

I have an extended 5 year additional 60K mile warranty so I'm def going to get the car checked out by a chevy dealer that knows vettes.

 

that's so you cant clear the codes right before inspection it didn't complete the readiness test yet, make the dealer fix it

 

Certain "obligations" are required for some sensors to report correctly. I learned this from my other car when trying to pass CA emmissions. Sometimes it is as easy as putting XX miles on, but sometimes it's XX miles at a certain mph. I'd start Googling.

San

 

Yes he is correct, and was not blowing smoke up your a$%. When any PCM codes are cleared, there is a certain drive cycle that must be performed before the OBD 'monitors' are set. Some cars take longer than others before they are ready to be tested.

If the fault codes that caused the 'check engine' light were just a fluke, then go have the emissions test performed again after a few days of driving (assuming the warning light stays off). If the light comes back on, you have a problem that will need to be fixed before you can pass testing.

Andy

 

Any time the OBD scanner is plugged-in to your system for inspection, the codes are reset on the assumption that an error may be responsible. Usually, they will tell you to drive about a hundred miles under various driving conditions including 55 mph+ , at which time the system has had a chance to either reset correctly, or show throw codes. After following the inspector's advice, if the codes still come-up, your dealer may or may not repair under warranty depending on what the codes represent.

 

BTW just so you know. Whenever you see a code that starts with a "P" it's regarding your powertrain. Anytime you see a code start with a "B" it's regarding your body control module.

 

For the P code, check the clutch switch. Could be loose, broken or just bad. That is, unless you do ride the clutch.

The B codes are coming up because the scanner they are using is having an issue. I'll bet the Infiniti dealer isn't using a Tech II. Probably have to take it to a GM dealer or a shop with a Tech II to get an accurate diagnosis on those codes.

 

Thank you guys. These are great forums here and great fellow vette owners.

If the clutch switch is bad, the check engine light should come on again at some point correct?

 

Yes and no. It could have hung and set a code at some point or the switch could decide to not close intermittently due to an issue with the internal contacts. Do a visual and if it looks like it's installed tight and not broken. If it check ok you can wait and see if it sets again. If it does, replace the switch.

And if it sets again, grab it's nuts and tell it to turn it's head and cough!

 

I would also think that if the clutch switch was truly bad then you wouldn't be able to start the car. Ever try getting the engine to turn over without the clutch depressed?

BJK

 

Well, I'm not 100% sure about the C6, but a lot of cars these days have 2 clutch switches. One is to recognize when the pedal is pressed to the floor (for engine start, etc.) and one that detects when the pedal is just starting to be pushed from it's rest position (ECM uses this for driveability functions, cruise control, etc.). So, it is possible that one could be bad and not affect engine start functions.

Andy

 

haha...no "nut grabbing" or hernia checks necessary....

Yea, there are definitely 2 switches. The cruise control shuts down when this code is thrown. It appears to be a position sensor...

 

You're right. I forgot about the cruise control, I always trip it with the brake pedal.

BJK

 

P0833 is part of the cruise control circuit. Check the switch or fuse.

 

Take a look at this.

#PIC4211: SES Light On, Cruise Control Inoperative P0833 DTC - keywords clutch lamp manual MIL MN6 switch transmission - (Sep 12, 2006)

Subject: SES Light On Cruise Control Inoperative P0833 DTC


Models: 2005 Chevrolet Corvette

Equipped with MN6 Manual Transmission Only




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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A customer may comment of the SES light on and the cruise control is inoperative. Further investigation will show DTC P0833 stored. There are 3 possible concerns. First, the clutch switch is mis-adjusted. Second may due to a software concern in the ECM. Third the customer may be inducing the concern by "riding" the clutch.

Recommendation/Instructions:
First, inspect the clutch switch adjustment per bulletin. 05-08-68-001

• The lower switch, the Clutch Pedal Position (CPP) Switch provides feedback to the PCM that the clutch pedal has been depressed to enable starting. The CPP Switch DOES NOT relate to the P0883 code.

• The upper switch, the Clutch Release Switch also referred to in SI as the Clutch Cruise Control Release Switch, provides the PCM feedback as to the position of the clutch pedal.

• Refer to Manual Transmission Component Views, Figure 2: 01 Y-Car: Comp Loc Views (Under LH Side of the Dash) SI Document ID # 714735 for switch locations.

Second, reprogram the ECM with an updated calibration in TIS-2-WEB. This calibration can be located under the "Engine Diagnostic". tab and select the calibration labeled...

"New calibration with diagnostic enhancements for DTC P0833"
Third, if the customer is "riding" the clutch, discuss this with the customer. This will prevent the customer from inducing the DTC. Refer to bulletin 05-08-68-001 for more information.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

#05-08-68-001B: Malfunction Indicator Lamp (MIL), Diagnostic Trouble Code (DTC) P0833, Cruise Control Inoperative (Adjust Clutch Release Switch) - (May 29, 2008)

Subject: Malfunction Indicator Lamp (MIL), Diagnostic Trouble Code (DTC) P0833, Cruise Control Inoperative (Adjust Clutch Release Switch)


Models: 2005-2007 Chevrolet Corvette

with 6-Speed Manual Transmission




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This bulletin is being revised to provide additional diagnostic information for setting the DTC. Please discard Corporate Bulletin Number 05-08-68-001A (Section 08 -- Body & Accessories).


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Condition
Some customers may comment on a malfunction indicator lamp. Some customers may also comment that the cruise control is inoperative.

A scan tool may reveal a DTC P0833. Cruise Disengaged History Reason will display "Lost Forward Gear" on Tech 2®.

Cause
The clutch release switch may be misadjusted.


There are two clutch switches
• The lower switch, the clutch start switch provides feedback to the PCM that the clutch pedal has been depressed to enable starting. This switch DOES NOT relate to the P0883 code.

• The upper switch, the clutch pedal position switch also referred to in SI as the clutch pedal cruise control release switch, provides the PCM feedback as to the position of the clutch pedal.

• Refer to Manual Transmission Component Views, Figure 2: 01 Y-Car: Comp Loc Views (Under LH Side of the Dash) in SI for switch locations.

Important: Multiple clutch presses during a single stop may provide inaccurate feedback to the PCM and the technician may misdiagnose the need to replace the PCM. The Tech 2® may not pick up the multiple presses which would appear that the PCM is not picking up the signal. The PCM should not be replaced if the Tech 2® does not pick up multiple clutch cycles during testing.

Conditions for Setting the DTC
• The vehicle speed goes from 0 km/h (0 mph) to greater than 39 km/h (24 mph) and back to 0 km/h (0 mph) for two seconds without the ECM detecting a clutch transition.

• This must occur seven times before the diagnostic reports a fault.

For additional information of DTC P0833, refer to SI.

Correction
DO THIS
DON'T DO THIS

Adjust the Clutch Release Switch
DO NOT replace the PCM.


•Adjust the Clutch Release Switch. Refer to Clutch Release Switch Replacement in SI.
•Once the Clutch Release Switch is adjusted, secure the Clutch Release Switch wiring harness with electrical tape or a plastic tie to a surrounding harness to insure the switch does not rotate and become misadjusted again.
•Clear the DTC with a scan tool.

 

I understand the function and need for two switches on the clutch pedal.... but I'm "Just Wondering" if you drag race the car, could someone "Who knew their STUFF" be able to use the upper switch as a "Two Step" so when you are staged, you can keep the gas to the floor, and the engine will only rev to a preset RPM.. and once you release the clutch, the engine will rev to its normal red line or to the original rev limiter...


Just a thought ?

 

Wow....thank you so much. Once again, great forums here and great fellow vette owners.