2006 Chevy Cobalt P0030 and Fuel Leak Help Please - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 12 (permalink) Old 06-14-2013, 02:59 PM Thread Starter
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Thumbs down 2006 Chevy Cobalt P0030 and Fuel Leak Help Please

Hello everyone

I just purchased 2006 pontiac pursuit with a 2.2l engine, it is exactly
The same car as the cobalt except for a few cosmatic differences

I purchased it with cel light when i read the codes i got the following

P0135
P0030

I managed to solve the p0135 by replacing the o2 sensor in bank 1
However i still cant figure out what p0030 is any help would be greatly appreciated

Also today i have noticed a fuel puddle under the rear passenger side tire i looked underneath the car and i see the fuel filter is some what rusty could that be the cause or is it the fuel lines?

Thanks for all your input in advance
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post #2 of 12 (permalink) Old 06-14-2013, 03:11 PM
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---------- Post added at 06:11 PM ---------- Previous post was at 06:10 PM ----------

And welcome
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post #3 of 12 (permalink) Old 06-14-2013, 03:40 PM
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Did you clear the codes?

Something to read...

DTC P0030
Circuit Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by the ignition 1 voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the powertrain control module (PCM).

The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM monitors the voltage on the HO2S heater low control circuit for heater fault diagnosis. If the PCM detects that the HO2S heater low control circuit voltage is not within a specified range, DTC P0030 sets for HO2S 1.
DTC Descriptors
This diagnostic procedure supports the following DTCs:

• DTC P0030 HO2S Heater Control Circuit Sensor 1

Conditions for Running the DTC
• The Ignition 1 Signal parameter is between 11-18 volts.
• The engine speed is more than 450 RPM.
• DTC P0030 run continuously when the above conditions are met.

Conditions for Setting the DTC
• The PCM detects that the affected HO2S heater low control circuit voltage is not within a specified range.
• DTC P0030 sets within 3 seconds when the above condition is met.
Action Taken When the DTC Sets
• The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
• The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

---------- Post added at 07:40 PM ---------- Previous post was at 07:39 PM ----------

For the fuel leak just follow the trail to it's highest point.

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Last edited by Coby7; 06-14-2013 at 03:44 PM.
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post #4 of 12 (permalink) Old 06-14-2013, 03:58 PM Thread Starter
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Thanks for the info coby 7 i must say am very confused
And still dont know how to proceed to fix the issue can please shed some light on me?
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post #5 of 12 (permalink) Old 06-14-2013, 04:28 PM
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P0135 is a oxygen sensor related to b1s1 or b1s2 (bank 1, sensor). It refers to the one before catalytic converter. Your o2 sensor malfunctioned at one point and is continuous from there on. It has to toggle up and down between lean and rich once your computer has reached closed loop. Unfortunately its not toggling enough or is slow on the ball. You will more than likely have to replace that oxygen sensor and clear the code after the new one is in. That will take care of that issue

Far as the p0030 issue code, seems like the PCM is not receiving the proper voltage from the 02 signal in order to reach its full engine operating temperature of 600 degrees. It may result with other issues to get to that desirable temp. For instance, your engine coolant temp sensor may be wack or default of -40 Fahrenheit in which it needs to be either replaced or the wires are faulty from the sensor to the computer (PCM). This may not be the cause, but its where I would start diagnosing.

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post #6 of 12 (permalink) Old 06-14-2013, 05:16 PM
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Quote:
Originally Posted by Eclipse98 View Post
Thanks for the info coby 7 i must say am very confused
And still dont know how to proceed to fix the issue can please shed some light on me?
The Cobalt is a bit sensative when it comes to HO2 sensors, eventhough aftermarket are cheaper and said to be equivalent to OEM specs, a lot of them fall short of the mark. If you cleared the codes and it comes back chances are the replacement HO2 is faulty, not up to spec or you have a bad wire between sensor and PCM.

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Last edited by Coby7; 06-14-2013 at 05:18 PM.
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post #7 of 12 (permalink) Old 06-14-2013, 05:43 PM Thread Starter
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Originally Posted by 5t3alth View Post
P0135 is a oxygen sensor related to b1s1 or b1s2 (bank 1, sensor). It refers to the one before catalytic converter. Your o2 sensor malfunctioned at one point and is continuous from there on. It has to toggle up and down between lean and rich once your computer has reached closed loop. Unfortunately its not toggling enough or is slow on the ball. You will more than likely have to replace that oxygen sensor and clear the code after the new one is in. That will take care of that issue

Far as the p0030 issue code, seems like the PCM is not receiving the proper voltage from the 02 signal in order to reach its full engine operating temperature of 600 degrees. It may result with other issues to get to that desirable temp. For instance, your engine coolant temp sensor may be wack or default of -40 Fahrenheit in which it needs to be either replaced or the wires are faulty from the sensor to the computer (PCM). This may not be the cause, but its where I would start diagnosing.
Thanks for all the info, coby 7, i guess they should call you cobypeida :P

I will focus on fixing the fuel leak first and i have a feeling its the fuel filter since i seen some rust on it and seems to be leaking from the area where the 2 pieces are welded together, so hopefully it will be a cheap fix however if not i will have to diagnose the fuel lines.

As far as the P0030 code, i must say its a doozy and still not sure where to begin, i will have to read more about it and see what i come up with, i will update you guys if anything new develops.

regards

Nim
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post #8 of 12 (permalink) Old 06-14-2013, 07:50 PM
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The fuel pump lines at the top of the pump are no good, they crack.
That's what I'd check for your leak, it is a known issue to GM.

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post #9 of 12 (permalink) Old 06-14-2013, 08:49 PM Thread Starter
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Quote:
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The fuel pump lines at the top of the pump are no good, they crack.
That's what I'd check for your leak, it is a known issue to GM.
Thanks for the info any ida if its a cheap fix
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post #10 of 12 (permalink) Old 06-15-2013, 10:52 AM
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I would not encourage a "Band-Aid" type of fix. It will end up coming back later on. Far as your p0030 code, you can run some dmm test leads at the sensor that's causing the issue and find the pcm's connector pin number and measure that too, should read the same. If its not, then you have either an open in the circuit (signal low), high resistance (too little of voltage readings), or a short to ground (high voltage).

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