Possible Causes of 2012 GMC Terrain Death Wobble When Starting Out While Flat Towing  

Question:

Expert Reply:

There are a few possible causes of what you have going on.

The owner's manual copy I looked at states that fuse # 16 is for the Antilock Brake System Module', and this fuse is mentioned in GM Tech Services Bulletin 17-NA-348 as needing to be pulled if you have a 4 cylinder model, instead of pulling # 32. Keep in mind, in a few vehicle, the ABS module fuse is in position # 15, so you'll want to look at the diagram of fuse positions on the lid of the fuse box. A fuse bypass, part # RM-76517 would prevent you from having to pull the fuse every time. You'll just hit a switch, rather than pulling out the fuse. Roadmaster also states that a # RM-156-25 charge line kit should be used to prevent the battery in your Terrain from going dead while flat towing.

There are other possible causes of the death wobble, it's possible that your tow bar arms haven't locked into place. On page six of the instructions, Roadmaster states that once everything is set up and you drive off to get under way, you should steer the tow vehicle to the left and right briefly to ensure that the arms of the tow bar lock. If this isn't done, it would certainly explain the wobble you've experienced. Also, if the tow bar isn't within 3 inches +/- of level, you'll have difficulty getting the bars to lock into place. If your tow bar is out of that range, you'll want to use the appropriate high/low adapter to place it within that range. I'll link you to our selection of adapters.

expert reply by: Mike L

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