Crank but no start, codes P0204, P0300, P0304 and P0401

Hi,

First, three of the 4 codes you listed are most likely the result of the P0204. See attached pic for injector description. That would have caused the P0300 and 304. The P0401 is normally an exhaust gas re-circulation code (EGR), but that code isn't shown for this vehicle, so I'm not sure on that one yet.

Now, here is what I need you to do. First check fuses 39 and 40 in the under hood fuse box. I attached a pic and highlighted the fuses. These fuses are responsible for the ignition coils.

Also, take a quick look at all fuses in the same box. There are ignition fuses that may have failed.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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Let me know what you disconnected and dried. If you are not sure of the component's name, if possible, take a pic and upload it for me to see.

I will watch for your reply.

Joe

Hi,

In addition to the fuses, is there power available to them? And was it 30 or 39 you checked? Also, if there is power to them and it still won't start, we need to check to see if there is spark and fuel to the engine. Ignition spark is my first suspect as being a problem and not fuel.

Here is a link that shows how it's done:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

I need you to check that for me. Let me know the results.

Joe

If you have spark, then it must not be getting fuel. Try one more thing for me. See if it starts for a couple seconds if you use starting fluid.

Also, when you say cylinder 4 had the strongest spark, how was it different?

As far as testing for power at the fuses, all you need is a basic test light. They are very inexpensive and easy to use.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Let me know.

Joe

See if it starts with starting fluid. If it does for a couple seconds and then stalls, it is a fuel related issue. And interestingly, the fuses you checked should have power when the key is in the run position. The idea that you got spark indicates it does.

Let me know what happens with the starting fluid.

Take care,
Joe

Okay. Chances are it isn't the pump, but rather something electrical. Check the following fuse. See attached pics. Pic 1 indicates the fuse purpose, pic 2 shows what it powers, pic 3 shows location in the fuse box under the hood.

Let me know what you find.
Joe

Check it for power. Something has most likely failed due to shorting from the water. It is hard to believe the pump failed. Not saying it isn't possible, but really odd. There is a fuse box in the trunk. I need you to check fuse 37 as well. See picture 1.

Sorry to be driving you crazy with fuses, but I really feel something got wet and shorted.

Joe

Chances are it is a power issue, but it could be something different. Can you hear the fuel pump prime when you first turn the key on? I'm starting to question if the pump is on but there is no fuel injection pulse. If you can, follow this link and see if there is an injector pulse.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

If you find there is a pulse, then lets check the pump. Even if you hear it, check for pressure. Here is a link showing how that is done. You will need a fuel pressure gauge, but most parts stores will lend it to you.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the manufacturer's specs for pressure:

2013 Cadillac ATS Sedan RWD L4-2.5L
Pressure, Vacuum and Temperature
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Specifications Pressure, Vacuum and Temperature
PRESSURE, VACUUM AND TEMPERATURE
The Fuel Pump Enable may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.

DO NOT perform the Fuel System Diagnosis if the engine coolant temperature is above 60°C (150°F). High fuel pressure readings may result due to hot soak fuel boiling. With the engine OFF, the fuel pressure may increase beyond the pressure relief regulator valve's setting point of 690 kPa (100 psi) ± 5 percent.

Ignition ON, engine OFF, command the Fuel Pump Enable ON several times with a scan tool.

Fuel Pressure Sensor parameter .................... 345-650 kPa (50-94 psi)
with the fuel pump running.

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Here are the directions for connecting a gauge to your vehicle. The attached pics correlate with these directions.

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2013 Cadillac ATS Sedan RWD L4-2.5L
Fuel Pressure Gauge Installation and Removal
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics Fuel Pressure Gauge Installation and Removal
FUEL PRESSURE GAUGE INSTALLATION AND REMOVAL
Fuel Pressure Gauge Installation and Removal

Special Tools

* CH-47831 - Fuel Line Disconnect Tool

* J 34730-1A - Fuel Pressure Gauge

* J 42982 - Fuel Pressure Gauge Adapter

Installation Procedure

Warning

Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.

Warning

Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gauge. Place the towel in an approved container when the connection of the fuel pressure gauge is complete.

Caution:
Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

* The fuel pipe connections

* The hose connections

* The areas surrounding the connections

1. Relieve the fuel pressure. Refer to Fuel Pressure Relief See: Fuel Pressure Release > Procedures > Fuel Pressure Relief.

2. Disconnect the quick connect coupling of the fuel feed hose from the fuel feed pipe of the fuel rail. Use a shop towel in order to catch any remaining fuel that may leak.

3. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement See: Intake Manifold > Removal and Replacement > Intake Manifold Cover Replacement.

4. Install the J 42982 - adapter between the fuel feed pipe of the fuel rail and of the fuel feed hose.

pic 1

Caution: Refer to Fastener Caution See: Vehicle > Technician Safety Information > Fastener Caution.

5. Install the J 34730-1A - gauge to the J 42982 - adapter, and tighten securely.

6. Turn ON the ignition in order to pressurize the fuel system.

7. Turn OFF the ignition.

8. Check for any fuel leaks.

Removal Procedure

pic 2

1. Relieve the fuel pressure. Refer to the Fuel Pressure Relief See: Fuel Pressure Release > Procedures > Fuel Pressure Relief.

2. Remove the J 34730-1A - gauge from the J 42982 - adapter.

3. Using the CH-47831 - tool, disconnect the quick connect coupling of the J 42982 - adapter from the fuel feed pipe of the fuel rail. Use a shop towel in order to catch any remaining fuel that may leak.

4. Disconnect the quick connect coupling of the fuel feed hose (3) from the J 42982 - adapter, and remove the adapter. Use a shop towel in order to catch any remaining fuel that may leak.

5. Connect the quick-connect fitting of the fuel feed hose (3) to the fuel feed pipe of the fuel rail.

6. Turn ON the ignition in order to pressurize the fuel system.

7. Turn OFF the ignition.

8. Check for any fuel leaks.

9. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement See: Intake Manifold > Removal and Replacement > Intake Manifold Cover Replacement.

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Let me know what you find or if you have other questions.

Take care,
Joe

Wow, that is crazy. I can't believe they told you the engine was bad. Ugh! Let me know what they find or if you need help with anything.

Take care,
Joe

Let me know. Here is a link that shows how to check for an injector pulse. See if it is something you feel comfortable doing. Did you tell them it starts with starting fluid?

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Joe