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04 cts 3.6 at full throttle, the transmission tries to

04 cts 3.6 at...

04 cts 3.6 at full throttle, the transmission tries to upshift, but shifts back into same gear. Engine light turns on briefly then back off. Also after this happens, my cruise control doesn't work for a while.

Mechanic's Assistant: Have you checked the fuse? What size is your engine?

It's a 3.6 like I said, and which fuse?

Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far?

Yes, and nothing so far, just researching.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Am a certified aircraft mechanic, do most of the work myself

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Answered in 1 minute by:
3/27/2018
tsmodie
tsmodie, Other
Category: Transmissions
Satisfied Customers: 16,436
Experience: ASE MASTER TECH, 30 YEAR EXPERIENCE, GAS AND DIESEL
Verified

Hi, my name is ***** ***** the computer sees a fault code in the transmission, it will shut off the cruise control, have you had codes pulled from the computer yet?

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Customer reply replied 27 days ago
Did myself, no tranny codes, I assume light turns on from over revving

were there any engine codes?

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Customer reply replied 27 days ago
Text is fine

were there any engine codes???

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Customer reply replied 27 days ago
Yeah, left cat is bad, but just replaced all injectors, pcv, and new o rings on everything going into the intake manifold. Just haven't installed new cat yet

are you getting a P0420 code?

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Customer reply replied 27 days ago
Nope

what code are you getting??

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Customer reply replied 27 days ago
Unless that's for the cat, my code reader uses words...

yes, the P0420 is a cat efficiency code

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Customer reply replied 27 days ago
Bank 1 catalytic converter operating below threshold or something to that effect.

ok, if the cat is partially plugged, it will set this code, and usually it happens on hard accelleration, this can verified with an exhaust backpressure test, this is done with a low pressure gauge screwed into the upstream o2 sensor hole, then start the car and let it idle, if the backpressure is any MORE than 1 psi, the cat is restricted, and will need to be replaced,Tim

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Customer reply replied 27 days ago
Understand, but shifting condition existed before that issue. Just had fresh engine installed, if that helps

if there are no other codes, there is no where else to go, the cat can definately cause this, any restriction in the exhaust can cause the drivabilty concerns, so this needs to be addressed first,Tim

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Customer reply replied 27 days ago
Like a dumbass, I replaced the cat before I did a leakdown test on injectors, took three days for light to come back on, so parked it untill I replaced all that stuff. I doubt it that restricted.

so you have replaced the cat??

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Customer reply replied 27 days ago
about a week ago or so, have new one, but weather has been bad...

if the injectors were leaking, it wont take long fr the cat to be damaged,Tim

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Customer reply replied 27 days ago
Understand, but again, not related to shifting issue

it absolutely can, I will opt out and see if another expert can help,Tim

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Todd Audette
Todd Audette, A.S.E Certified Master Technician
Category: Transmissions
Satisfied Customers: 419
Experience: GM Transmission Technician
Verified

Hi my name is ***** ***** i'm a Gm Factory Trained Certified Transmission Technician. I agree with the previous expert that any driveability issues will absolutely hinder the transmission performance....if the trans feels like it's not operating properly but you have engine codes and no trans codes then the engine codes need to be addressed first and foremost...A partially blocked exhaust will cause your issue

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Customer reply replied 27 days ago
After I install new cat, if problem persists, will I be charged again for advice? It may be like a week till I can get around to it

You will not....I will be available for any follow up questions you may have at any time and would be more than happy to continue if need be. Rating 5 Star will not close out your question and you will not be charged anything additional

Todd Audette
Todd Audette, A.S.E Certified Master Technician
Category: Transmissions
Satisfied Customers: 419
Experience: GM Transmission Technician
Verified
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Todd Audette
Todd Audette
Todd Audette, A.S.E Certified Master Technician
Category: Transmissions
Satisfied Customers: 419
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