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I have a 2009 Buick enclave, chk engine light is on. P0420…

I have a 2009...

I have a 2009 Buick enclave, chk engine light is on. P0420 code came back from a diagnostic. Replaced the fuel pump. Now having issues with the gas gage..I will fill the tank completely but the gauge reads that the car is empty. Gauge keeps fluctuating as I drive, from full to Empty. Now, I can't drive it without it sputtering to a stop, reading Power reduced to engine. Would a bad fuel pump, cat converter, or O2 sensor make my car shut down and sputter to a stop like that?

Mechanic's Assistant: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?

I don't know.

Mechanic's Assistant: Are you fixing your Enclave yourself? What have you tried so far?

Mechanic.

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Answered in 9 minutes by:
3/17/2018
Eric
Eric, Automotive Repair Shop Manager
Category: Buick
Satisfied Customers: 34,027
Experience: 20+ yrs. experience as repair shop manager and technician.
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HI,

While a bad fuel pump can cause the engine to sputter to a stop and cause issues with the gas gage, it will not set a P0420.

A bad O2 sensor, while it can set the P0420 code, will not cause it to sputter to a stop

A restricted converter will both set the P0420 code and cause it to sputter to a stop.

However it will not cause gas gauge reading issues.

So you have two separate issues - a bad converter and either the fuel level sensor on the fuel pump is defective out of the pump, loose connector at the pump or faulty gage. It the gas gage issue did not start until replacing the fuel pump, then it is either a defective unit out of the box or loose connector.

If you had a shop replace the pump, you need to return to them to have it checked and either correct loose connector or if connector ok, replace the pump under warranty

And for the P0420 code, you will need the converter replaced

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Customer reply replied 1 month ago
The mechanic that is working on my car said that if the cat converter needs replacing and that that is the reason why my car is stopping, then he wouldn't have been able to drive my car at least 30 miles this morning. He feels like it isn't the cat converter that is causing my car to stop every now and then and say REDUCED POWER TO ENGINE. He says we wouldn't be able to drive the car at all if the cat converter was the issue. What is making my car sto, saying REDUCED POWER TO ENGINE?

HI,

Ok, you did not mention that it could be driven that long before the reduced power message came on and it sputtered to a stop.

Most likely the new fuel pump is defective out of the box.

I would replace it, erase the code and if the code returns but no sputtering to a stop and no reduced power message, replace the downstream O2 sensor

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Eric
Eric, Automotive Repair Shop Manager
Category: Buick
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