Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is Chris. In order to properly diagnose the problem I will need to know what "code" is associated with the check engine light. It is possible that the EGR system is faulty but without code it would be a guess. Do you know the code or have the capability of retrieving the code?
No. I was told yesterday by my mechanic.
He said that it looks like that the EGR was recently changed.
He had cleared the light from the dash and now it is on again.
The car jerks when shifting from 1st to 2nd and when I slow down, it jerks when down shifting.
I did check the trans. fluid and it is ok.
I will need to know the code that is associated with the light. It will be a four digit code, your mechanic should be able to provide it if he looked at it yesterday. The symptoms you described could be a number of different things on the vehicle, with the code we can isolate which system is problematic and go from there. do you know which engine you have/ 3.4L or 3.8L?
O.K., how many miles on car?
I am calling the mechanic now to see what code showed.
ok, i'll wait
They did not record the code.
Not in the vehicle's records.
If the light is on, it is an active code. you will need to retrieve for further diagnosis. Do you have access to a scan tool?
No, does autozone have the capability?
If you are near an AutoZone, they will scan it for free.
I can go and see, but it will take some time.
how do I get back here?
ok bookmark this page and return to it when ready. I may be away but leave post/message and I will get back to you promptly.
i am back
I have the code.
the code does not make any sense to me.
hello....need help please....
what codes did you get?
doesn't make sense to me
I am looking at the receipt from autozone.
P0724 indicates a problem with the TCC brake switch. The TCC (torque converter clutch) is located internally within the transmission.
there is most likely a malfunction at the switch, wiring(open,shorted to power,shorted to ground) or PCM
what is the cost to get it repaired? ballpark?
All depends, If it is the TCC brake switch, which I suspect, somewhere in the neighborhood of 200, parts and labor. that is just a guess without knowing your shops labor rate and exact price of component and whether the switch is the problem
what else could it be and could that cause the check engine light to go on?
with the code you gave me, nothing. Each code is specific to a system, the one you provided indicates a malfunction with the TCC system.
that is the code on the receipt.
if there was a problem with say the EGR you would have a different code number such as a P0404
is that the same as the evap module
the mechanic said that they are both the same...is that correct?
no, that was just an example to differentiate between code numbers
the evap system is different than the EGR system
what is the difference?
I know that the evap has something to do with the gas fumes, etc....correct?
and could the computer be wrong?
One is for evaporative emissions the other is for exhaust gas recirculation
the mechanic did say that he noticed that the evap module looks new.
is that like a 20 dollar part or so?
given the symptoms and the code you provided, there is a malfunction with the TCC system.
symptoms meaning car jerking when changing gears and check engine light on?
probaly a little more, check with Autozone, they may carry it. The TCC brake switch is part of the brake switch assembly
yes those symptoms
does the trans. need to be taken apart to replace the TCC switch?
since you said it is internal
if the switch is malfunctioning the PCM interpets the data incorrectly and engages/disengages the TCC at the wrong times thus resulting in bucking and jerking being felt by the driver
no, it is part of the brake light switch/stop lamp switch located under the dash attached to the brake pedal arm
so the TCC affects the trans, and not inside of it correct?
the TCC brake switch is not internal and it does affect trans operation
so how much would that costs to change the TCC switch.....200 or so?
can you send me a diagram of where the TCC switch is located please?
i do not have diagram available
where could I find one?
Possibly AutoZone they are able to print diagrams
where is it located on the 03 impala?
it is part of the brake light switch/stop lamp switch located under the dash attached to the brake pedal arm
anything else could it be?
yes, switch, wiring(open,shorted to power,shorted to ground) or PCM make sure to check all fuses as well
what is the PCM, the computer?
Powertrain Control Module, yes the computer
so the computer may be it as well????
and would the TCC switch trigger the check engine light?
as i have already stated twice, yes the computer could be the problem, or the switch or the wiring (an open,shorted to power,shorted to ground wire) and yes it will trip the check engine light
can i get a printout of this conversation?
I not sure, my screen looks different than yours
try right clicking and copy/paste into word