99 passlock and knock sensor issues

[rbadenjr]

I am working on a 99 4wd 5.7 Tahoe
about a month ago replaced the ecm for a ac compressor always running issue which fixed that

Now I am getting a security passlock codes
b2947
b2958
b2960
most of the time it will start. once in a while security light will come on but will run sometimes it starts and stalls
check all the wires in the column nothing looks worn or broken

Also getting a
po325 knock sensor code
have changed the knock sensor double checked the wire and torque of the sensor
code comes up as soon as the diagnostic scan runs. almost like the sensor isn't even there
road testing there are no misfires in data collection and no audible knocks

If anyone has had any of these issues please share your fix or story with me

Thank you
Randy Baden Jr

[j cAT]

Originally Posted by rbadenjr

I am working on a 99 4wd 5.7 Tahoe
about a month ago replaced the ecm for a ac compressor always running issue which fixed that

Now I am getting a security passlock codes
b2947
b2958
b2960
most of the time it will start. once in a while security light will come on but will run sometimes it starts and stalls
check all the wires in the column nothing looks worn or broken

Also getting a
po325 knock sensor code
have changed the knock sensor double checked the wire and torque of the sensor
code comes up as soon as the diagnostic scan runs. almost like the sensor isn't even there
road testing there are no misfires in data collection and no audible knocks

If anyone has had any of these issues please share your fix or story with me

Thank you
Randy Baden Jr

the pass lock should be bypassed. this is a big failure item on these models. expensive to repair so bypass is done.

the KS issue may be from bad wiring .325 code open circuit or very low output . PCM maybe damaged also if it got wet .

send some of the rain up my way we need several inches to get back to normal ...

[brcidd]

I bypassed my 99 yukon with a GMATTI module that is designed to be used in remote starter applications, I just wired it so it is always active, and not just during a remote start request- cost me $14 off the Bay