My enginge feels like its kicking hard into gears sometimes more than others. and then my ETC engine fail safe mode came on and car was losing power. what is this from?

On GM vehicles starting back in mid 2000's , maybe even before that. They started using inputs to the body control module from the ignition switch, from there the BCM controls all vehicle systems .
Power Mode Description and Operation
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory.
To determine the correct power mode the BCM uses:
?€¢
The state of these signals

?€¢
The sequence of switch closures received by the BCM

?€¢
The status of the engine run flag

The chart indicates the power modes detected and transmitted by the BCM:

Correct Ignition Switch Inputs
Ignition Key Position

Power Mode Parameter

Engine Running

Sampled Ignition Signal State

Accessory

Ignition 1

Ignition 0
OFF
Off-Awake or RAP
No
Inactive
Off
Off
UNLOCK
Unlock or RAP Unlock
No
Inactive
Off
On
ACC
Accessory
No
Active
Off
On
ON
Run
No
Active
On
On
START
Crank
No
Inactive
On
On
ON
Run
Yes
Active
On
On
Fail-safe Operation
Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.
Serial Data Messages The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
You would need a scan tool that can read data from the BCM . What may be the problem is a lose connector , these pin's at connectors are tiny and doesn't take much for one to become lose.

Is the Transmission give you this problem, check this real quick jack up both front wheel and spin by hand. The wheel shoul spin in different direction as soon as you spin, if you spin one wheel and the other wheel don't spin right a way, and catch up later on then is the problem

sounds about right for what i think it is ,now remove the EGR valve and make a gasket from a coca cola can and do not cut the middle out ,so it blocks it off completely then try it as i am almost positive this is your problem .

I understand all you said

Without the vehicle and a fresh
diagnostic approach, I personally
don't think any internet ideas will help

You still have misfires, that are spiking the PCM &
TACM on the throttle body and putting it
into ETC Fail Safe.

Sounds like your catalytic converters may be plugged up. You can do a quick check by loosening the exhaust pipes from the manifolds and see how it performs.

Hello! Fail safe mode is when the vehicle's computer detects a serious problem an allows you to "limp" off the road or highway safely.

Fail safe mode on a Jaguar is mainly caused by a dirty and gummed up throttle body. The throttle body on your auto has a protective coating, so you can not use just any cleaner. It requires a throttle body cleaner that states "safe to use with a protective coating". The butterfly valve in the throttle body will actually "stick out". This causes fail safe mode to kick in reducing the amount of power your engine can produce.

Also check the plugs on your ECM (computer) and make sure they are all seated properly.


Guru...............saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

on the older style blazers the fan clutches did fail and would often be misdiagnosed as shifting problems as the clutch engaged and disengaged.... also a hard 1-2 shift can be due to your vehicle storing a transmission fault code in the ecm... some transmission fault codes will put the transmission into a fail safe or limp mode in which it engages high line pressure .... this can cause your hard 1-2 shift and will feel normal most of the time other than that. high mileage on the transmission fluid may also require it to be flushed and have the filter kit replaced

The engine gray smoke is from excessive fuel burning to give the engine power. I am assuming the vehcle is an automatic transmission. Sound like I would have the transmission check for a lock up torque convetor. The transmission maybe taking off in second gear and starting out in a fail safe mode. I suggest taking to the dealer or tranmission shop.

Could Be that your TCM is losing power. I would check to see if the TCM is firmly attached to the passenger side fender wall. If not it could be losing the ground.

need more info? is car missfiring or has been missfiring? does it happen when cold? or hot? and how much fuel does car have in it? does it happen when less fuel or more fuel or know diffrent? cant help