20 Most Recent 2003 Cadillac CTS Questions & Answers

The pcv valve is at the rear of the engine on the passenger side down behind the valve covers. It's a $200.+ item that I could only find through NAPA. Other places show it but no go. It's an aluminum part nothing like the old pcv valves. It has 4 bolts that fastens it to the block.
It is a royal pain to change.
There are hoses running from it up to the plastic pieces on top of the plenum running forward. Those parts get clogged too.
I'm changing mine now and hope it cures the quart of oil every 200 mi. This is what I have read is the problem.

2003 Cadillac... | Answered on Jan 12, 2020

check the main DC power wires, for any damages...
else the there is a internal problem with the radio

2003 Cadillac... | Answered on Sep 29, 2019

Here is a diagram of the firing order.

2003 Cadillac... | Answered on Sep 01, 2019

the first thing is to make sure battery is good, if the computers in car dont have the right voltage the act crazy, they do things like the problem your having,the computer cant operate correctly with half or 3/4s power.start with battery and connection at battery. good luck,

2003 Cadillac... | Answered on Jul 04, 2019

On this website you find fuse box diagram and description for Cadillac CTS (2003 and 2005)


2003 Cadillac... | Answered on Apr 24, 2019

I have a similar problem with a 2003 cadillac cts. The water drips from the bottom area of the glove compartment. If you would stick your hand under and feel around, there is a removable panel ( two small bolts and one star screw) there , you will fell the sponge on the other side of the panel is wet. I removed this panel and ran the air conditioner and place a large mirror on the floor and shine a flash light up but did not see any water dripping.
The Driver side has a similar panel, I removed that also but saw nothing, not even the canister. But the out side pipes from the AC show the canister leads in the hood under ther driver side.
Any way I looked under the car and found the drain hose. It is located under the driver seat area. I tried fishing a coat hanger through it and it went a long way up. If you look on the side panel where the parking brake is located you will see this hose going to the top of the hood. You will need to depress the parking brake for a better view. I tried the Ac bot no condensation water came throug.
I late found a similiar hose on the passenger side. I tried to push the wire in but did not get too far.
One of these hoses drain the Sun ( moon) roof.
I then took a cap from a silicone tune ( u know the screw on tip that you cut at 45 degrees) That I inserted into the tube under car, then I insert a small funnel into the silicone cap , next with my garden ready and flowing , I force water up through the AC drain hose. Dont do too long, 5 to 7 secs is good. You will see the water come through the other drain hose. It is best to have some onlookers. Note some water might flow up to the moon roof drain and into the car so place some towel on the seat.
That works for me.
Thanks all
and good luck

2003 Cadillac... | Answered on Apr 08, 2019

Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.

2003 Cadillac... | Answered on Jan 31, 2019

Most likely needs a wheel balance.

2003 Cadillac... | Answered on Sep 08, 2018

If it's 4 cylinder it's 1342, if it was ok and now wont start has immobilizer got stuck??

2003 Cadillac... | Answered on Mar 04, 2018

you have a low voltage problem. either a bad battery or a brake in a wire somewhere. My sister had the same problem in her car. Had it to the gm dealer 3 times they couldnt figure it out. I put a new battery in, new wire from batter to starter, and a new altenater and wires to it. just by dumb luck i noticed the (+) wire from the bat to the fuse box under the hood was broke at the fuse box. Put new wire on it and 2.5 years later no problems.

2003 Cadillac... | Answered on Feb 12, 2018

Don't know how you read these codes but their is no H in back .
Factory service repair info.
DTC B3832 or B3833
Express Up operation of the front door power windows is monitored and controlled by the front door modules, the window sensors, and the 4 connecting circuits. Each front door window motor has a window sensor mounted to it. The driver door module (DDM) and the passenger front door module (PFDM) each supply battery positive voltage and ground to power their respective window sensors. Each door module communicates with its sensor via a power window high speed serial data circuit, and a power window low speed serial data circuit. The window sensor detects differences in the window motors electrical pulses to determine if there is an obstruction to the travel of the window glass. The door modules use the information generated by the sensors to disable the Express Up movement of a window, or reverse the direction of travel, in the event that a passenger, or other obstacle, has become trapped in it.
The power window low speed serial data circuit is a unique 2-way serial data link between the door module and its sensor. The actual position of the window glass, in relationship to the distance traveled by the window, is communicated via this circuit, as well as state-of-health messages and the direction in which the window is traveling.

DTC B3832 may be set and the Express Up function disabled if the vehicle or the door module has recently lost power for any reason. You should first attempt to re-initialize the Express Up function. Refer to Window Motor Programming - Express Function .
If DTC B3832 is accompanied by DTC U1714, utilize the DTC U1714 or U1716 diagnostic table before using this table. Refer to DTC U1714 or U1716 .

DTC B1420
Battery positive voltage is supplied at all times to the seat adjuster switch and the memory seat module (MSM) through the same circuit. The MSM uses this battery voltage input to determine if battery positive voltage is applied to the seat adjuster switch.
DTC B1825, B1850, B1860, B2355, B2365, or B2375
Circuit Description
The position sensor that sets this DTC is attached to the seat directional motor. It receives a 5 volt reference and low reference from the memory seat module (MSM). The sensor sends a voltage signal that varies with the movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the appropriate Sensor parameter in the Memory Seat Module Sensor data list.
Does the scan tool indicate that the Sensor parameter is within the specified range?
0.25-4.75 V

Sure you can move the seat back . Connector # 3 at the MSM ,pin's S & N - lite green & tan wires . Give a ground to one an B+ to the other ,if it moves in wrong direction switch the wiring around ..

2003 Cadillac... | Answered on Jan 28, 2018

I have no clue what any warranty has to do with any light coming on when you first start your Cadillac. I cannot help you with your problem unless I know which light is coming on. Then, even if I knew which light was coming on, it would probably require scanning the onboard computer system in you vehicle to find out why the light is on. What would you like for me to do for you?

2003 Cadillac... | Answered on Jan 21, 2018

Have your dealer or a qualified Cadillac mechanic check the anti-theft system and your key. Your ECM may need to be re-flashed, but have a diagnostic scan performed to determine possible solutions.

2003 Cadillac... | Answered on Jan 19, 2018

Recommend taking your car to dealer or a mechanic who can perform diagnostic scan. Then report back with trouble codes for possible solutions.

2003 Cadillac... | Answered on Jan 19, 2018

Heat sensor on the Engine more than likely. If it gets stuck the car thinks it's still hot and won't let it re-start until it completely resets.

2003 Cadillac... | Answered on Jan 16, 2018

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