TSB 16-NA-276 Transmission Shudder - Chevy Colorado & GMC Canyon
 
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post #1 of 5 (permalink) Old 01-24-2017, 10:46 AM Thread Starter
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TSB 16-NA-276 Transmission Shudder

Hello, feel free to move this, it is diesel specific.

I have a '16 Diesel Z71 4x4, about 7k on the clock. I was experiencing a slow speed issue with the transmission. When in slow traffic, coming to a stop, approaching a stop sign/stop light, the transmission did not seem to release. The RPMs would stay above 1000. Sometime the RPMs would pulse.

Either way, after driving like this for a while, the truck would smell hot, having to hold the brakes to hold back the truck was not the safest feeling.

Called the dealer and they dug up this TSB, which I found on this site:

https://www.repairprocedures.com

Condition:
Some customers may comment on shudder at low speeds, and idle surge when stopped or approaching a stop.
During diagnosis a technician may find DTC P0401 (Exhaust Gas Recirculation Flow Insufficient) set or stored.

Cause:
This may be due to a calibration concern within the Engine Control Module (ECM).

So far the truck is driving like normal. I don't think I've had some of the other complaints about transmission issues other places on this forum, but I'm hoping this will cure this.

Thanks.

Last edited by Skullman; 01-24-2017 at 10:50 AM.
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post #2 of 5 (permalink) Old 01-24-2017, 10:55 AM
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While this may have felt like a transmission issue, the TSB notes that it's cause by the EGR system so not really a trans. issue
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post #3 of 5 (permalink) Old 01-24-2017, 11:38 AM Thread Starter
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Quote:
Originally Posted by lqdchkn View Post
While this may have felt like a transmission issue, the TSB notes that it's cause by the EGR system so not really a trans. issue
Yes, after the fact, it turned out to be computer related (surprise, surprise) but the only feeling was related to the transmission. It was as if the torque converter wasn't disengaging or something. I'd have to drop it into Neutral at a stop just to give my brakes a rest.
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post #4 of 5 (permalink) Old 01-24-2017, 12:31 PM
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Quote:
Originally Posted by Skullman View Post
Yes, after the fact, it turned out to be computer related (surprise, surprise) but the only feeling was related to the transmission. It was as if the torque converter wasn't disengaging or something. I'd have to drop it into Neutral at a stop just to give my brakes a rest.
Because the EGR (emissions) valve wasn't closing. EGR is known to cause rough idle that's why is supposed to only be very slightly open, if at all, at idle.

Think of it like how the engine "idles up" to compensate for when the AC compressor kicks on, it's sorta like that...except in this case the engine was trying to compensate for something it shouldn't have needed to.


Glad you got it all worked out thogh
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post #5 of 5 (permalink) Old 01-26-2017, 10:33 PM
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It sounds like you are experiencing the elevated rpm from a regen of the DPF. This is done automatically, unless the filter is very full or it has had multiple unfinished regens you will not see a notice on the DIC for this. A regen is when the exhaust filter is cleaned by heating up the exhaust above 900 degrees, you may experience an odor during this time.

16 Crewcab Duramax Allterrain
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