Hard Starting
Thread Starter
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Freshman User
Joined: Dec 2006
Posts: 28
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From: Wyoming is my home
Hard Starting
My truck has been hard to start lately so I checked for codes and two came up
P0603 and P1211 does anyone know what these codes are. My truck is a 99 F-350 Dually 4X4 with a automatic. Thanks for your info
P0603 and P1211 does anyone know what these codes are. My truck is a 99 F-350 Dually 4X4 with a automatic. Thanks for your info
Thread Starter
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Freshman User
Joined: Dec 2006
Posts: 28
Likes: 0
From: Wyoming is my home
Yes,
This is everthing I have done to it: Superchip, AFE stage 2 air intake, Bullydog 4" turbo back, Bullydog Outlook, ATS Five Star TC. I haven't had any problems but after a long trip pulling my trailer it doesn't want to start as easily any more. So I hooked up my superchips and did a diagnostic test and it came up with those two codes P0603 and P1211. Any ideas?
This is everthing I have done to it: Superchip, AFE stage 2 air intake, Bullydog 4" turbo back, Bullydog Outlook, ATS Five Star TC. I haven't had any problems but after a long trip pulling my trailer it doesn't want to start as easily any more. So I hooked up my superchips and did a diagnostic test and it came up with those two codes P0603 and P1211. Any ideas?
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
603 is generally caused by the chip/tuner and the 1211 most of the time when a chip/tuner is involved is not a problem, it just the HPOP cant produce the pressure the tuner is calling for.
Is the hard start only when the truck is hot and cranked shortly after it is shut down
Is the hard start only when the truck is hot and cranked shortly after it is shut down
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Is it only hard to start when the engine is cold, or all the time????? Cold hard starts are simply a glow plug system issue. Test your relay and/or glow plugs.
0603 is caused by the tuner. Ignore it.
1211 is more than likely caused by the tuner when you are hard accelerating. It happens to a lot of us and it doesn't hurt anything. The code basically stands for "high oil pressure higher/lower than desired" and trips after 7 seconds of lower or higher than called for pressure. Many HPOP's have a hard time supplying oil that a higher hp tuner or chip calls for, and you set the code at WOT runs.
If you are having problems starting even when the engine is warm, then you need to find out if the 1211 code is the issue. To check and make sure, clear the 1211 code and make sure your tuner is on a lower hp setting. First check the oil in the HPOP by popping off the cap at the top of the reservoir. The oil level should be within a 1/2 inch from the top. If it's ok, then put the plug back in. Next, crank up and drive NORMALLY, no WOT runs at all. Return home and scan for codes again. If it pops up again, then you may have IPR or ICP issues which is causing your hard start. If not, then you have fuel issues.
0603 is caused by the tuner. Ignore it.
1211 is more than likely caused by the tuner when you are hard accelerating. It happens to a lot of us and it doesn't hurt anything. The code basically stands for "high oil pressure higher/lower than desired" and trips after 7 seconds of lower or higher than called for pressure. Many HPOP's have a hard time supplying oil that a higher hp tuner or chip calls for, and you set the code at WOT runs.
If you are having problems starting even when the engine is warm, then you need to find out if the 1211 code is the issue. To check and make sure, clear the 1211 code and make sure your tuner is on a lower hp setting. First check the oil in the HPOP by popping off the cap at the top of the reservoir. The oil level should be within a 1/2 inch from the top. If it's ok, then put the plug back in. Next, crank up and drive NORMALLY, no WOT runs at all. Return home and scan for codes again. If it pops up again, then you may have IPR or ICP issues which is causing your hard start. If not, then you have fuel issues.
