Question about 2003 Cadillac CTS

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Loss of engine power and T/C light comes on CTS 2003

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My 2003 cts runs but has no power at gas peddle

Posted on Aug 19, 2013

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Posted on Jan 02, 2017

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SOURCE: my engine light is on in my 2003 Cadillac CTS

You can also check the codes by pressing F1 and F6 on you radio at the same time (while the key is in the on position)

Posted on Jan 13, 2010

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SOURCE: 2003 Cadillac CTS won't start after disconnecting battery

Don't do that again! You will need to re-boot the on board computer system by entering a code. Call your nearest Cadillac dealer.

Posted on Dec 13, 2011

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How do you install camshaft and lifters in 2003 Cadillac CTS 3.2 Liter V6 Engine?

Too big a job for an answer here. Best to buy a service manual if you want to try to do the job yourself

Oct 15, 2014 | 2003 Cadillac CTS

1 Answer

2003 Cadillac cts service idle control reduce engine power

I have 03 cts and service idol control shows when I start the car sometimes and sometimes comes on while driving. I had everything cleaned and everything was good for a week then the engine light would go on and off, I think I may need a new sensor for the idol control or replace it. My question is if I keep driving it will it effect anything else ?

Sep 18, 2012 | Cadillac Cars & Trucks

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When i put gas in my 2003 cts its hard to start,and i can hear a noise coming from the the gas tank area

I see 2 things to test and not knowing what sound it makes, I make these recommendations.

First, when you open the gascap, your sealed system is no longer sealed. This means the vacuum must be restored to reseal the system. You have a venting system which can be checked with a smoke test machine.

This usually makes a Code or lights a check-engine light, but I imagine since the car is not running but only cranking the light may not go on. The noise you hear may be valving closing to create a vacuum. But since this is interferring with the starting, the integrity of the system should be checked.

The fuelpump and fuelpump pressure regulator should be checked. Your fuel should not leave the engine high and dry for several reasons. The system should maintain line pressure even overnight. The fuelpump should be capable of repressurizng the system within seconds, so hard starts should not occur from this. Loss of the vacuum seal on the gascap should not cause the fuel to drain from the lines and the pressure regulator should provide a one-way valve to prevent loss of pressure.

I work primarily on Ford products and unless GM has some sort of prevention system for starting with no fuel, there should be no reason to have these problems.

I would like to know how this ends up when you find out.
There are really

Mar 30, 2012 | 2003 Cadillac CTS

1 Answer

2003 Cadillac CTS won't start after disconnecting battery

Don't do that again! You will need to re-boot the on board computer system by entering a code. Call your nearest Cadillac dealer.

Nov 28, 2011 | 2003 Cadillac CTS

1 Answer

" Is there a combination of instrument panel

Press F1 and F6 on the radio at the same time and hold down. When you release, all the lights will come on, then a prompt to "clear code" - push the select button (round knob to the right of the radio). This will clear the code. If the engine light does not turn off, unhook battery cables, clean them, then re attach. This has happened to my CTS a few times.

Oct 16, 2011 | 2003 Cadillac CTS

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I have 55,688 miles on my 2003 CTS. The low oil pressure/stop engin warning light comes on after I have been driving for 20 minutes or so only when car is idling at stop signs. The oil registers full and...

I was just wondering what happened with your engine??? Because mine is doing the same exact thing, and i am kinda scared.
thank you, email me if u get this at

Oct 20, 2010 | 2003 Cadillac CTS

1 Answer

Check engine light comes on and car starts to downshift hard

Please take the car for a scan to reveal any problem/ error codes causing this.

Good luck,

Jul 15, 2009 | 2003 Cadillac CTS

1 Answer

My 2003 cts keeps turing off as soon as the car engine gets warm

Thi could be a crank sensor/ cam sensor problem. It could be a grounding problem or a variety of problems. Did the check engine light come on? If so, then get a scan done to identify the exact cause of the problem.

Dec 24, 2008 | 2003 Cadillac CTS

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