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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15690
Experience:  15 years GM master tech
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I have a 2004 chev suburban and I am gettingtwo codes CO240

Customer Question

Hi. I have a 2004 chev suburban and I am gettingtwo codes CO240 and P2135 the engine light comes on and says reduced engine stability system disabled
JA: Thanks. Can you give me any more details about your issue?
Customer: vibrates and eventually shuts off while I am driving, already changed throttle body/sensor
JA: OK got it. Last thing — Chevy Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 9 months ago.
Category: Chevy
Expert:  Gary replied 9 months ago.

I am sorry your having this problem

did changing the sensors in the throttle body help at all ?

Customer: replied 9 months ago.
no it did not help. it is still doing it
Expert:  Gary replied 9 months ago.

if you clear the code how soon before they reset ?

Customer: replied 9 months ago.
it resets and the engine light goes back off then 5 minutes later it comes back on
Expert:  Gary replied 9 months ago.

do you have a multi meter on hand ?

Customer: replied 9 months ago.
no
Expert:  Gary replied 9 months ago.

hands down the biggest issue causing this code is the throttle body connector itself with the wires internally in the connector have bad crimps on them the best action is to replace the connector with a new one

if by chance it still sets this code and the wiring visually is good between the throttle body and the TAC module you need to replace the complete throttle body

those are the 3 things that cause this code

if you have any questions please ask as i do not get credit for my work until you rate us here at Justanswer

Customer: replied 9 months ago.
all these have been replaced already.. what about the EBCM code it gives?
Customer: replied 9 months ago.
it gives both of those codes
Expert:  Gary replied 9 months ago.

this has a brand new connector on it ?

Customer: replied 9 months ago.
yep and a throttle body and sensors
Expert:  Gary replied 9 months ago.

ok with that code set to find the problem we need to do some tests with a multi meter

Customer: replied 9 months ago.
ok
Expert:  Gary replied 9 months ago.

then we can do a few volt tests