LIMP mode
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Joined: Jan 2022
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LIMP mode
I have an 07 burb 1500 lxt. Almost 250k on it. Yesterday after running for almost an hour hour and half she did the Engine power is reduced. Turned off for about 3 minutes and was able to drive the 10 minutes home without further issue. This morning it ran for 30 minutes to take kids to school and did it again. Oil and transmission fluid levels are good. Spark plugs are good. Now I've also got a new "poof" noise at shut off. Any advice and/or suggestions??
CF Beginner
Joined: Nov 2022
Posts: 8
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My 03 Tahoe would go into limp mode for seemingly no reason and was giving me code P1518, TAC module. Ultimately, this problem was caused by a wiring problem with the grounds. 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 (my guess is that the ground was causing the problem from the beginning).
Thread Starter
CF Beginner
Joined: Jan 2022
Posts: 6
Likes: 0
My 03 Tahoe would go into limp mode for seemingly no reason and was giving me code P1518, TAC module. Ultimately, this problem was caused by a wiring problem with the grounds. 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 (my guess is that the ground was causing the problem from the beginning).
Thank you for sharing! I'm not so inclined but my boyfriend is and I do believe has the equipment to test wiring, I'll pass it along to him so he can check it out! Thank you again!
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