buick verano tcm malfunctioning

[devon]

 

[devon]

new battery , starter , and alternator first pictures is after i turn the lights off the voltage drops to 12.5 and the brake light on the gear shift selector disappears and the last picture is after i turn the bright lights on. don’t know what can be the problem i’ve tried everything

 

[MelsRegal]

Have you used a scan tool?

 

[devon]

Have you used a scan tool?

yes it only says lost communication with tcm

 

[MelsRegal]

yes it only says lost communication with tcm

What is the code?

 

[devon]

What is the code?

u0101

 

[MelsRegal]

Do you ever get voltage readings higher than 12.5?
Have you used a handheld voltmeter to test alternator output?

 

[devon]

Do you ever get voltage readings higher than 12.5?
Have you used a handheld voltmeter to test alternator output?

yes when i turn the bright lights on the voltage increases to 13.8 up to 14.1 , and yes i got it checked at autozone

 

[MelsRegal]

Who decided you needed a new battery, alternator and starter, you or a shop?

 

[devon]

Who decided you needed a new battery, alternator and starter, you or a shop?

the car stopped working after coming from the store, battery was completely dead and starter was making a loud noise when trying to start it. so we got a new battery and starter and the car started working again. thing is before the car stopped working and we changed the parts it did not have any problems with the tcm losing connection or headlights blowing out randomly. sometimes the backup camera and trunk button won’t work when the tcm acts up

 

[MelsRegal]

the car stopped working after coming from the store, battery was completely dead and starter was making a loud noise when trying to start it. so we got a new battery and starter and the car started working again. thing is before the car stopped working and we changed the parts it did not have any problems with the tcm losing connection or headlights blowing out randomly. sometimes the backup camera and trunk button won’t work when the tcm acts up

Why the alternator?
It appears something is not right with the parts or the installation of them caused an issue. Check the battery cables for corrosion possibly under the insulation.

 

[devon]

Why the alternator?
It appears something is not right with the parts or the installation of them caused an issue. Check the battery cables for corrosion possibly under the insulation.

we changed the alternator because the alternator was supposedly overcharging so i thought the voltage regulator went bad. voltage was at 15.5 after we put the new battery and starter in and stayed in the high range around 15.1

 

[devon]

Why the alternator?
It appears something is not right with the parts or the installation of them caused an issue. Check the battery cables for corrosion possibly under the insulation.

 

[devon]

checked the battery cable and it has some greenish discoloration on the copper wire under the insulation

 

[devon]

@MelsRegal also it’s a gap between the insulation and cable end , will that cause issues

 

[MelsRegal]

checked the battery cable and it has some greenish discoloration on the copper wire under the insulation

That's a bad cable