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2009 Acadia, has had service stabilitrac and traction

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control for a while, now...
2009 Acadia, has had service stabilitrac and traction control for a while, now misfire in high gear when under light throttle feels like torque convertor shudder. Had p0402 code. Could cat be bad causing this?
Submitted: 2 years ago.Category: GMC
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Answered in 14 minutes by:
1/24/2016
GMC Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: GMC
Satisfied Customers: 25,788
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Databases
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Hello, my name is***** the check engine light ever flash? P0402 is related to EGR and this vehicle does not have a EGR.

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Customer reply replied 2 years ago
Scan said catalyst bank 1.
Customer reply replied 2 years ago
May have been 0420
GMC Mechanic: Dan, Technician replied 2 years ago

That would make more sense. Does the check engine light ever flash?

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Customer reply replied 2 years ago
it will come on and then go off in a couple of days
GMC Mechanic: Dan, Technician replied 2 years ago

Usually if the catalytic converter is clogged it will make vehicle act like a rpm limiter such as not want to go over 3500 rpm. Does the check engine light ever flash rapidly? The steering wheel angle sensor usually causes the stablitrak and traction control lights but you need to check codes with scantool capable of reading abs codes. P0420 is a PCM code.

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Customer reply replied 2 years ago
I will check ABS codes now. No rapid flash. Also main issue is the rpm jumpy in 6th gear under light acceleration. Then like rumble strips before it down shifts. My reader identifies codes and said catalyst out of range bank 1. I cleared it or I would dbl check
Customer reply replied 2 years ago
Abs code c0710
Also the car will not rev over 4000 rpms
Customer reply replied 2 years ago
If I power brake only revs to 3k but doesn't try to spin
GMC Mechanic: Dan, Technician replied 2 years ago

Ok, so it does sound like your catalytic converter is the hesitation and P0420 problem. C0710 is also for the steering wheel position sensor. If vehicle has under 80k miles converter will be replaced for free by dealer and steering wheel position sensor is about a $300 job, dealer scantool is needed to recalibrate new sensor. Let me know if you have more questions, thanks.

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Customer reply replied 2 years ago
If it said bank 1 which convertor is it. Also could the convertor cause the jumpy in high gear situation
GMC Mechanic: Dan, Technician replied 2 years ago

Yes the converter could cause it to be jumpy in high gear. Bank 1 is the side of engine with cylinder 1 which is the rear of engine by firewall. Let me know if you have more questions, thanks.

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Customer reply replied 2 years ago
Seems like there would be a cause for the failure of the converter. No misfire codes.
GMC Mechanic: Dan, Technician replied 2 years ago

The converter can just fail without any causes. Things that can cause early converter failure is engine burning oil, burning coolant, or misfire. If all of those are good I'd assume it just failed without any external cause. Let me know if you have more questions, thanks.

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Customer reply replied 2 years ago
After driving yesterday it will rev over 5k in drive seems pretty strong in gear but is still jumpy and acts like its stumbling in 5th and 6th gear at low throttle
GMC Mechanic: Dan, Technician replied 2 years ago

Can you take a video of problem? Thanks.

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