Q: My 2009 Cadillac CTS won't start

asked by on

2009 cadillac cts 3.6. Problem I'm having is I can't start the car, or even get a click. My battery is good, lights are on. Dash on, signals work. When I checked the starter relay socket I have very low voltage. I can jump the car with wires going from starter relay socket into ground. I think something shorted out. I checked the wires to fuse box, all are good nothing frayed or burnt. When I put my test light in the socket I get a clicking sound near the engine, I can't see where it's comming from but it sounds like it's in the housing right on left side of intake manifold where the big hose goes into the intake. Trying to take the cover off its hard and im scared of making this worse. So my question is really why do I have low current in the starter relay socket. The relay is good. I changed it anyway. Can you guide me? Thank you.

My car has 60000 miles.
My car has an automatic transmission.

I’m a bit concerned about your description of using a jumper wire to ground at the starter relay. Either you can make the starter motor turn from here, which you could if you jumper the correct terminals with power, or you used a jumper wire and something shorted out. Which one of these is the case is not exactly clear. If you did short something out, this becomes more complicated.

Your Cadillac relies on the ECM (engine control module) and the BCM (body control module) to start your car. For this reason, you will need a scanner that can access data from your car. These modules communicate via data lines that only a computer can make sense of. Also, there are four separate wires going into the starter relay. Each one needs to be treated differently and this can only be determined with a wiring diagram. If you don’t have access to these two items, I recommend having a certified technician inspect the starting problem in person in order to get this properly diagnosed and repaired.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My 2009 Cadillac CTS won't start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Remote start quit working, check engine light came on...why?

Hi Kat. Thanks for the question tonight. Anytime a check engine light is illuminated, it means the onboard computer (ECU) has detected a fault from a sensor that impacts the operation of the vehicle. It then stores a code in...

Q: ECM might need to be reprogrammed.

The message "start disabled" is telling me that the car is not allowing the car to start due to a security system fault. There are 2 likely causes for your issue. The first is a faulty transponder in your key....

Q: Had a P0200 (open injector circuit) code thrown earlier in the day but continued to drive with no issues.Also the check engine lig

If you are losing power to electrical system when you turn key on and try to start it then you may have a bad alternator not recharging the battery. Have the battery and charging system tested if you can get...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.