Turns shudder and 2 codes
Thread Starter
Intermediate
Joined: Jan 2025
Posts: 33
Likes: 50
From: Costa Mesa, CA
Turns shudder and 2 codes
Pulling out of the grocery store parking space today, trans shuddering badly and thus illuminating the check engine light. OnStar diagnostics produced P0700 and P1962 which i believe is the real culprit. I idle creep disabled too as I was getting it moved into the garage until Monday when the dealer opens for service.
any help for background with either/both codes will be most appreciated. Google search is not producing very much at all. It’s a 2025 Stingray 2LT with 4400 miles. It has been flawless up to this point. Thanks for any and all help and taking the time to read all this.
any help for background with either/both codes will be most appreciated. Google search is not producing very much at all. It’s a 2025 Stingray 2LT with 4400 miles. It has been flawless up to this point. Thanks for any and all help and taking the time to read all this.
Melting Slicks
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From: Myrtle Beach SC/Charlotte NC
Burning Brakes
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From: Western Mass
I've had P0700 codes get thrown while on the track. Cleared and no issue. The other code is more serious. Could be a hard failure in a solenoid or other component. It'll get fixed under warranty.
Pro
Joined: Sep 2014
Posts: 502
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GM codes P0700 and P1962 together
indicate a severe transmission control system fault, specifically pointing to a failed transmission vane pump (or related hydraulic pressure failure) on GM vehicles. P0700 is a general request for the check engine light due to a Transmission Control Module (TCM) error, while P1962 indicates the pump is not providing proper pressure.
Bill
indicate a severe transmission control system fault, specifically pointing to a failed transmission vane pump (or related hydraulic pressure failure) on GM vehicles. P0700 is a general request for the check engine light due to a Transmission Control Module (TCM) error, while P1962 indicates the pump is not providing proper pressure.
Bill
Race Director
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might not be bad
P0700 is simply informational - it instructs the car to turn on the MIL (aka CEL). I looked up the P1962 in the version of the C8 Service Manual that I have. Procedures can change, but here are the highlights I found - and it includes a step you might be able to perform if you have scan tool - also the code will clear after a few ignition cycles if the condition that caused it goes away. Notice in green are some steps that you can do. But if the code comes back and there are no other codes, it goes straight to a transmission replacement. And this is where the procedure may have been updated - I don't have the latest information - but now GM allows some component replacments that were not previously allowed.
DTC Descriptor (I think the second one Odd Gear Clutch applies to the code you have)
Odd Gear Clutch Safety Performance 1
Odd Gear Clutch Safety Performance 2
Verify there are no DTCs set related to the following system/component (you only report having one code (other than the p0700 so you have no other codes set)
If a related DTC is not set
6. Ignition/Vehicle >> Off
7. Scan Tool >> Disconnect
8. Driver Door >> Open and close the door.
9. Wait 60 s before proceeding to the next step.
10. Clear the DTCs.
11. Ignition/Vehicle >> Off
12. Scan Tool >> Disconnect
13. Driver Door >> Open and close the door.
14. Wait 60 s before proceeding to the next step.
15. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed
from the Freeze Frame/Failure Records data.
16. Verify the DTC does not set.
17.
If only DTC P1960, P1962
Replace the component: T12 Automatic Transmission
DTC Descriptor (I think the second one Odd Gear Clutch applies to the code you have)
Odd Gear Clutch Safety Performance 1
Odd Gear Clutch Safety Performance 2
Verify there are no DTCs set related to the following system/component (you only report having one code (other than the p0700 so you have no other codes set)
If a related DTC is not set
6. Ignition/Vehicle >> Off
7. Scan Tool >> Disconnect
8. Driver Door >> Open and close the door.
9. Wait 60 s before proceeding to the next step.
10. Clear the DTCs.
11. Ignition/Vehicle >> Off
12. Scan Tool >> Disconnect
13. Driver Door >> Open and close the door.
14. Wait 60 s before proceeding to the next step.
15. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed
from the Freeze Frame/Failure Records data.
16. Verify the DTC does not set.
17.
If only DTC P1960, P1962
Replace the component: T12 Automatic Transmission
Last edited by Vetteman Jack; Feb 6, 2026 at 07:03 AM.
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Melting Slicks
Joined: Aug 2017
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From: Massachusetts
Andy, would you agree that step-10 infers that the ignition is on, not running, need to run scan tool?
This is step-11 states to set ignition Off.
Step-6 insures the ignition if Off. Previous steps may have it On.
Thanks Andy for providing all this technical info we don't have access to!
This is step-11 states to set ignition Off.
Step-6 insures the ignition if Off. Previous steps may have it On.
Thanks Andy for providing all this technical info we don't have access to!
Thread Starter
Intermediate
Joined: Jan 2025
Posts: 33
Likes: 50
From: Costa Mesa, CA
Thank you, Bill this is the info I can greatly use when bringing in the vehicle to the dealer tomorrow. And thank you, Andy also for your info also. No scan tool here. Looks like it’s best to have it towed to the dealer and not chance driving it there. Dang it.
Last edited by 1953C8; Feb 1, 2026 at 11:17 AM.
Thread Starter
Intermediate
Joined: Jan 2025
Posts: 33
Likes: 50
From: Costa Mesa, CA
What are the chances??? Was talking to my wife about the above info using a scan tool which I don’t have and she then proceeds to go upstairs and bring one down to me! Sh said it was for my birthday next Monday but maybe you can us it today! Haha. Will give it a try shortly, a Creador Elite G.
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Andy, would you agree that step-10 infers that the ignition is on, not running, need to run scan tool?
This is step-11 states to set ignition Off.
Step-6 insures the ignition if Off. Previous steps may have it On.
Thanks Andy for providing all this technical info we don't have access to!
This is step-11 states to set ignition Off.
Step-6 insures the ignition if Off. Previous steps may have it On.
Thanks Andy for providing all this technical info we don't have access to!
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Racer
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From: Central Texas
Attached is what my service manual (Chilton's) says for this DTC, as well as the procedure it states to follow if the code continues to reappear.
It instructs to replace the valvebody though, not the clutch assembly.
It instructs to replace the valvebody though, not the clutch assembly.
Thread Starter
Intermediate
Joined: Jan 2025
Posts: 33
Likes: 50
From: Costa Mesa, CA
once I get back to California I will head to the dealer for a little discussion. Hard to deal with this 3000 miles away right now.
Race Director
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Does your Chilton's manual have a clutch replacement or clutch component replacement procedure in it? I think the clutch related repair procedures, and availability of the parts necessary to do so is relatively recent development - may within the last year or so. The GM on line manuals are updated as needed fro all model years - I don't know how the Chilton's manual works.
Race Director
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Here the version I have:
Racer
Joined: Dec 2025
Posts: 486
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From: Central Texas
Does your Chilton's manual have a clutch replacement or clutch component replacement procedure in it? I think the clutch related repair procedures, and availability of the parts necessary to do so is relatively recent development - may within the last year or so. The GM on line manuals are updated as needed fro all model years - I don't know how the Chilton's manual works.
Here are all the R&R procedures available in the Chiltons for the trans:
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Folks have speculated about the reason internal repairs were not originally included in the diagnostic procedures. One thought being that GM/Tremec wanted the transmissions back for analysis. With repair procedures and parts being dribbled out as they determined the failure conditions and possible repairs. But its clear (and I suppose obvious) that parts availability is major factor as well. They have to be able to supply internal transmission components needed for the repairs.
https://gm-techlink.com/?p=20396