Welcome to Allpar. There are 2 different 2.4Ls offered. A PZEV & a LEV. Spark plug requirements are different (copper vs. platinum). The platinum plugs may cause misfires in a LEV application. Use OEM Champion or NGK.
The cat & the PCM software was changed for the U67 recall?
The 2.4L MultiAir/VVT is sensitive to engine oil viscosity. Thicker oil will slow the timing/valve control hydraulics and may set fault codes/cause driveability issues.
Multiple component failures at the same time do raise my suspicions that the problem is not with the components themselves. You are wise to investigate other explanations such as wiring, etc. See the 'Possible Causes'.
You have a VVT 'slow response' code that could be oil viscosity. There is an OCV (oil control valve) cleaning procedure that can be tried. See the YouTube video below.
Both camshafts (1 & 2) have open position actuator circuit (OCV) codes.
The fuel system rich code needs to verify the correct fuel pressure (about 58psi or 400kPa). Wrong O2 sensors are a Possible Cause also. Be sure to use OEM O2 sensors. Bosch or Universal can be problematic.
Check engine compartment wiring, connectors & grounds for being clean & tight. Corrosion can hide under ground screws & terminals.
Is the engine noisy? A mechanical assessment (compression/cam & crank timing) may be in order if it is suspected. PCM failure is rare, but should be left on the table.
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The cat & the PCM software was changed for the U67 recall?
The 2.4L MultiAir/VVT is sensitive to engine oil viscosity. Thicker oil will slow the timing/valve control hydraulics and may set fault codes/cause driveability issues.
Multiple component failures at the same time do raise my suspicions that the problem is not with the components themselves. You are wise to investigate other explanations such as wiring, etc. See the 'Possible Causes'.
You have a VVT 'slow response' code that could be oil viscosity. There is an OCV (oil control valve) cleaning procedure that can be tried. See the YouTube video below.
Both camshafts (1 & 2) have open position actuator circuit (OCV) codes.
The fuel system rich code needs to verify the correct fuel pressure (about 58psi or 400kPa). Wrong O2 sensors are a Possible Cause also. Be sure to use OEM O2 sensors. Bosch or Universal can be problematic.
Check engine compartment wiring, connectors & grounds for being clean & tight. Corrosion can hide under ground screws & terminals.
Is the engine noisy? A mechanical assessment (compression/cam & crank timing) may be in order if it is suspected. PCM failure is rare, but should be left on the table.
