2011 equinox stalling

[charlie5000]

I have a 2011 Equinox with 101,000 miles on it. None of the mechanics I go to can seem to find the problem. The engine stalls constantly, and sometimes it hesitates like it's not getting gas. I have permanent code p0506 and p0420, and more initial codes. I've replaced the high pressure fuel pump, and the timing system was done, which cost me over 2000 dollars. There's also a misfire that won't go away. Anyone had a similar problem

 

[Hey Vern!]

That is surprising considering the codes. Both could cause your issue.

P0506 is an OBD-II trouble code meaning the Idle Air Control (IAC) System's RPM is lower than expected, often causing rough idling or stalling, especially when shifting or at low speeds, as the Powertrain Control Module (PCM) detects the engine speed dropping below its programmed limit. Common causes include a dirty throttle body, carbon buildup in the IAC valve, vacuum leaks, or faulty sensors (like the Throttle Position Sensor), with solutions often involving cleaning or replacing these components to restore proper idle.

A P0420 code means the catalytic converter on "Bank 1" is not working efficiently, based on signals from the oxygen sensors. While it most often points to a faulty catalytic converter, other potential causes include exhaust leaks, bad oxygen sensors, or engine problems like misfires or fuel mixture issues. The check engine light will illuminate, and the vehicle may experience poor fuel economy or a rotten egg smell from the exhaust

 

[2025 Red Equinox]

I have a 2011 Equinox with 101,000 miles on it. None of the mechanics I go to can seem to find the problem. The engine stalls constantly, and sometimes it hesitates like it's not getting gas. I have permanent code p0506 and p0420, and more initial codes. I've replaced the high pressure fuel pump, and the timing system was done, which cost me over 2000 dollars. There's also a misfire that won't go away. Anyone had a similar problem

You did not list the vehicle engine type.

With the P0420 - I’d bet replacing the oxygen sensors would eliminate the problem.

 

[Colin Lister]

I have a 2011 Equinox with 101,000 miles on it. None of the mechanics I go to can seem to find the problem. The engine stalls constantly, and sometimes it hesitates like it's not getting gas. I have permanent code p0506 and p0420, and more initial codes. I've replaced the high pressure fuel pump, and the timing system was done, which cost me over 2000 dollars. There's also a misfire that won't go away. Anyone had a similar problem

My 2018 diesel engine stopped a few times when driving off after starting. Then would crank over but not start. It was not the fuel pump but the fuel pump circuit board module. Got that replaced and it goes better than ever.