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: Key stuck in ignition of a 2006 Cadillac CTS

Make sure your shifter is fully engaged in PARK. If it is not, the key will not come out. If the vehicle is in park, the problem could be the ignition switch. I would enlist the help of a trained...

Q: Hard startup immediately after fill up with gas. Then starts quickly each time until next fill up.

The most common cause of hard start after fill up is going to be the excessive gas fumes during refueling the vehicle will flood the engine causing the hard or no start. The excessive fumes will normally be stored in...

Q: Q: car won't start

Hello there, many faults will prevent your 1995 Dodge Neon from starting. I am unsure of your meaning of the air valve. Common causes of a no start condition are the battery, starter, fuel pump, ignition switch, battery cables, fuel...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.