2004 Cadillac CTS - Page 6 - Answered Questions & Fixed issues

A failed brake light switch or brake light circuit fuse will cause BOTH problems. Start by verifying that the fuse is OK, then proceed with replacing the brake light switch if the fuse was not at issue.

The sender unit,which measures your fuel, is a resister attached to a float.(basically) the more fuel the less resistance,and the gauge reads a full tank .I believe this little unit has worn out.Unless you have an access hatch in the floor under the rear seat to access the unit the gas tank has to come out to replace.Contact your dealer for this information.This unit is incorporated into your fuel pump so this gets replaced as well. It can get pricey to deal with,so you might just want to keep the tank full all the time,given this is a ten year old car you have to be the best judge as to how much you want to spend on it .good luck

I would say most likely the ignition coils are bad The dealer made their money when they sold it to you They can fix it, but don't have very high standards for the techs or no supervision,something ! Almost half the people that come to this site can't get a vehicle even diagnosed at a dealer The technology is passing everyone by You have ignition coils on each cylinder They only last about 6 to 7 years & will go into failsafe if they misfire bad enough,that is called a Class A misfire,you won't pick those up in the shop with test equipment,maybe on a scope, but I doubt many mechanics use one or know how Have to just walk a new coil,road test or replace the coils, when you have those issues The main problem is vehicles are only driven Never tested during the year & no one knows that you have to do anything other than change the oil & wait for them to break down & that is what is happening I would change all the ignition coils 6 or 8, replace the front oxygen sensors & clean the maf sensor & replace the spark plugs every 3 years,those I would have done the week I bought it I hope you changed ALL the fluids, power steering,trans, brake & rear axle. Need to road test with a professional scan tool to look at all data & look at cylinder misfire count,fuel trim & see that the 8 monitors run clear,you need them okey, in order to go to inspection & pass

Sorry then you do not qualify for the recall.

Then it does not apply, recalls go by vin number on all makes and models, just because there is a recall that doesn't mean your particular car's VIN has the problem. Contact the dealer for a read out of all Recalls or call GM customer service with your make model and VIN code..

the first thing you need to do is get the vehicle scan as the check engine light is up meaning you vehicle is in limp mode

I have a 2004 cadillac cts. I'm getting ready to give it a tune up. Do the valve covers get filled with oil and there fore need to be replaced as well??

I got a 2004 cadillac cts with 130 thousand miles and I'm getting ready to give it a tune up. do the valve covres get filled with oil?? where as i would have to replace them too??

need unlock code or take to any GM dealer to unlock

P0300 = radom misfire could be any cylinder monitor engine misfire screen and see which cylinder is misfirering

Yep,should be 2 clamps I believe.

had the same thing happen to me. dealership told me it was a safety feature that when it runs out of gas it wont start again without clearing the code so they said. I hade mine towed to dealership and let them mess with it, cause I also put more gas in it and eventually drained my battery trying to start it.

egr valve faulty or vacuum leaks, idle air control valve faulty

check your codes first.

in reverse or forward gears??

Many of the master cylinders have connection for a brake light pressure switch. Some also active the brake lights by placing a switch directly under the brake pedal. You may need to build your own bracket.

that shouldnt be, put the fuse back and see if lights return . next go to front hubs you will see wires coming out of the hubs unplug and clean the contacts then plug in again abs will probley work . other wise onplug and black tape[ well ]the wires going up the frame so if a person changes hubs the abs can be easlie reactivated.

Normally the on-board computer just realigns itself to the new components. If you are asking how to reset the Check Engine light, that requires and OBD-ii scantool.

It sounds like you have a belt slip on the power steering pulley. The water acts like a lubricant and the belt slips at the wet area. You may need a new belt.

Please verify year make model. I cannot find Cadillac DTS in 2004.