P0689, p0335

addukes82

Original poster
Member
May 13, 2023
8
Utah
2006 trailblazer SS. Rear wheel drive.

Quick back story. Truck was stolen and recovered out of Cali. They took the cats. Was recovered by a gentleman in Az that owns a yard. He replaced the cats and new exhaust. I bought it from him and now it's in Utah.

Truck throws 2 codes. P0689 for PCM relay I believe and a p0335 for a crank shaft position sensor. Truck looks and sounds amazing, fires right up Everytime.. I get the crankshaft position code, possibly change that. But I'm lost on the p0689. Seen something about a bad fusebox connection, will pull the box apart to check it out.

Anyone have any insight? Info or help. I've been scratching my head on where to start.
 

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Mooseman

Moderator
Dec 4, 2011
25,671
Ottawa, ON
It could be a bad or missing relay or fuse or the fuse box may have a broken trace. Could also be the ignition switch if it's not sending proper power. Check the relay slots for power and grounds according to the schematics.
 

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