Video #2 - 2003 Chevrolet Tahoe - "Service Brake System" and Loses Power

[@thebandittransam9191]

I posted a video of what I’m experiencing. I had changed my water pump and rad after it blew and all of a sudden I started having abs and brake light come on. When my headlights are on and I hit the brake, my hazards with illuminate. And sometimes when I’m just out driving, the theft light comes on and some of my gauges shut off with the battery light on as if I just put the truck to ON position. All of it will happen while driving around

[@fabulousfinds7714]

Update: This problem was caused by a wiring problem. The repair was completed by my local Chevrolet dealership's service department, so I can't tell you how to make the repair, but this is what was written on my service receipt: "G104 improperly located on back of engine block. Relocated G104 to back of cylinder head and cleaned grounds. Traced wiring and found loose connection causing poor connectivity, putting strain, and causing heat build up. Corrected wiring issue and test drove. Concern resolved." I have not experienced any more problems with this vehicle since having the repair completed in March 2020. The source of this problem was very difficult for the technicians to locate. The vehicle was showing the P1518 error code, so before they found the burned out ground, the service department replaced a rear wheel speed sensor ($260.00) and the TAC module ($640.00), which may or may not have been causing the problem. If you are someone with the knowledge and equipment to check for a wiring short, I recommend you do this first. The sensor and TAC module may or may not have needed replacing. Good luck with your troubleshooting, and if you manage to fix your problem, please add information to the comments so you can help out someone else!

[@shawngregory6637]

May I ask how much it was to repair this

[@fabulousfinds7714]

@@shawngregory6637 The dealership only charged me for the original repair involving replacing the TAC module ($640) and rear wheel speed sensor ($260). After having these repairs made, I got the Tahoe back from the dealership, and the same problem with the P1518 error code happened, and it lost power. When I took it back to the dealership, they did not charge me anything at all the second time and found and corrected the wiring problem. The following is printed on my receipt: "G104 improperly located on back of engine block. Relocated G104 to back of cylinder head and cleaned grounds. Traced wiring and found loose connection causing poor connectivity, putting strain, and causing heat build up. Corrected wiring issue and test drove. Concern resolved." I am guessing that just repairing the wiring problem--which I believe was the sole source of the error code and losing power--would have been a relatively inexpensive repair, like in the $200 range, at most. It seems like this is just a really hard problem for most mechanics to solve. Good luck with your vehicle!

[@fernandodiaz7164]

So what was the problem

[@fabulousfinds7714]

@@fernandodiaz7164 This problem was caused by a wiring problem. The repair was completed by my local Chevrolet dealership's service department, so I can't tell you how to make the repair, but this is what was written on my service receipt: "G104 improperly located on back of engine block. Relocated G104 to back of cylinder head and cleaned grounds. Traced wiring and found loose connection causing poor connectivity, putting strain, and causing heat build up. Corrected wiring issue and test drove. Concern resolved." I have not experienced any more problems with this vehicle since having the repair completed in March 2020. The source of this problem was very difficult for the technicians to locate. The vehicle was showing the P1518 error code, so before they found the burned out ground, the service department replaced a rear wheel speed sensor ($260.00) and the TAC module ($640.00), which may or may not have been causing the problem. If you are someone with the knowledge and equipment to check for a wiring short, I recommend you do this first. The sensor and TAC module may or may not have needed replacing. Good luck with your troubleshooting, and if you manage to fix your problem, please add information to the comments so you can help out someone else!

[@bryangonzalez29]

Usually this happens because abs sensor wire needs replaced cheap fix under 50 $ it would really help also if you had a snap on scanner that way you lift the car up and rotate each tire and the scanner would tell you if your abs sensor working

[@MegaHowtoMan]

Bad ground? New battery terminals fixed mine.

[@homegrownluv8106]

Not transmission light.

[@DrKushLove]

We have replaced the master cylinder booster and vac pump with abs module still same problem ?? Any help please ?

[@fabulousfinds7714]

My Tahoe's issue was caused by a wiring problem with the G104. This is what the service tech wrote on my ticket: "G104 improperly located on back of engine block. Relocated G104 to back of cylinder head and cleaned grounds. Traced wiring and found loose connection causing poor connectivity, putting strain, and causing heat build up. Corrected wiring issue and test drove. Concern resolved." I wish I could offer you more help. Maybe someone else who has had the same problem can give you some suggestions. Anyone who can help--Please respond to Nickolas Bennett. This is much an infuriating problem!!

[@amgreen1894]

My issue is similar to my 2003 tahoe when it rained service brake system warning then the car started to jerk off on shifting all through the gears

[@mikehensley3486]

did you ever figure out what was causing problem?

[@hassanalkhalifah9259]

Same problem right now with my gmc sierra, changed the speed sensors and nothing have changed. Please any help?

[@omarbermejo3294]

​@hassanalkhalifah9259 ground wire abd your wheel barring can be in bad condition

[@wtfobiden]

Ground connections that are corroded are the devil for electronics

[@77gladius]

Quick question dod the power door locks also engage during this issue?

[@fabulousfinds7714]

Yes, the doors would lock and unlock; the interior lights would come on; and the chime would ding a few times (as it does if you start driving without completely closing the rear access hatch.)

[@fabulousfinds7714]

Also, if you may want to watch the first video I posted showing how the ABS and emergency brake lights would come on when I hit a bump. Here is the link: kzbin.info/www/bejne/jmXMf6Ctd5ifo9U My Tahoe was experiencing all of these different types of problems before the dealer's service department finally fixed the wiring problem with the G104's being improperly located, as I described in the comments I posted some time ago.

[@fabulousfinds7714]

Just found this video: kzbin.info/www/bejne/gWS7gKSbfZd7eaM This man had the same problem PLUS he shows how he repaired it!

[@77gladius]

Fabulous FF thank you so much! It has been a nightmare, you have helped me immensely! Thank you.

[@alecwebb1834]

Check all your ground wires ASAP

[@rickgee4195]

Bad ground strap wire… my suv was doing the same thing

[@dariusdunn9631]

Wheel bearing needs replacing and brake fluid filled to level

[@omarbermejo3294]

This problem is due to ground wire and also my valeros where bad and that fixed my problem there is a ground wire right below your front tire , driver side

[@Tesla_USA]

Check the ground for your battery.

[@hectorelfather4788]

Can You fix it? Got the same problem

[@curtisgunn3477]

Mee tooo

[@peterzavala6451]

Lmao Anyone found the solution? Same problem

[@randylee2549]

It can be 1 of 3 grounds Notorious and common

[@fabulousfinds7714]

@@randylee2549 This is printed on my receipt: "G104 improperly located on back of engine block. Relocated G104 to back of cylinder head and cleaned grounds. Traced wiring and found loose connection causing poor connectivity, putting strain, and causing heat build up."

[@randylee2549]

@@fabulousfinds7714 ahh thats 1 of those 3 behind the engine to the firewall. Must be all good now 😁

[@joelmartinez7366]

Was it the alternator?

[@fabulousfinds7714]

The problem was due to a loose wiring connection explained in the "update" I posted to this video. Since the service department made the repair, I don't know how to tell you to make the repair.

[@AriesRox2012]

0:02 0:55

[@frankm8533]

Mine all came on after I bleed the brakes on passenger side won't go off no problems before Junk GM

[@michaelwilson0889]

Same issue. Did u ever figure it out?

[@frankm8533]

@@michaelwilson0889 Nope never could figure it out. I sold the truck it was nothing but problems I got tired of fixing something every month

[@martinordonez6760]

😳y apoco ya se reparo.

[@Colima2012]

Check the brake fluid is low this is why

[@da1deylust]

Serpentine belt maybe about to break

[@gixer75]

Alternator