P0603 code
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Senior User
Joined: Sep 2008
Posts: 312
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From: Huntsville, Tx
P0603 code
Last night i was on may way home as i neared my road i let the truck coast to about 40mph, stepped on the throttle and nothing the truck didnt accelerate or do much of anything, tried it again and it sounded like the engine wanted to rev up but nothing, no power or anything, yet she stayed running at idle. yet the idle sounded kinda rough almost like air go in the system. Anyhow coasted in my drive way switched tanks and and let it idle while i looked under the hood, put in back in gear and i had power again and moved around, and shut it down for the night. Took it out this morning and drove it and it ran just fine, like nothing ever happened. brought it back and used my superchips to read codes and got a P0603, also i switched the tanks back as well(thought i might have gad bad fuel) and the same ran fine. Can anyone help me figure out what would set the code and why my truck acted so weird? Sorry for the long post. (programmer is set to tow-safe, and the 14.7k mod was not on when this all happened,if that helps)
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Joined: Aug 2006
Posts: 10,764
Likes: 39
This is just a WAG ,,I have heard of this after a down grade ,,You suprised the PCM ,I may not have recognized the IVS off,or wasn't expecting it .
May need to test the TPS itself for a flat spot
IIRC 603 is the batteries Or the PCM were unhooked
May need to test the TPS itself for a flat spot
IIRC 603 is the batteries Or the PCM were unhooked
