unfortunately no ! Your best bet take it to the dealer . The
P0420 always ends up being the catalytic converter ! P2104 isn't throttle air control .
P2112 - Throttle Actuator Control (TAC) System - Stuck Closed.
Description:
This powertrain control module (PCM) fault status indicates the throttle plate is at a lower angle than commanded.
Possible Causes:
- Binding throttle body, stuck closed.
- Damaged PCM.
Diagnostic Aids:
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to DV1
P2104 - Throttle Actuator Control (TAC) System - Forced Idle
Description:
The TAC system is in the failure mode effects management (FMEM) mode of forced idle.
Possible Causes:
- Open or short in multiple accelerator pedal position (APP) sensor circuits.
- Damaged APP sensor.
- Damaged powertrain control module (PCM).
Diagnostic Aids:
This DTC is an informational DTC and can be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first.
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to QE1
P0506 - Idle Air Control (IAC) System RPM Lower Than Expected
For Vehicles With Electronic Throttle Control (ETC)
Description:
This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM.
Possible Causes:
- Air intake restriction.
- Exhaust restriction.
- Engine mechanical fault.
- Damaged electronic throttle body (ETB).
- Damaged PCM.
Diagnostic Aids:
This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air restrictions and damage. If no concerns are present, clear the DTC and retest.
For All Others
Description:
This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM.
Possible Causes:
- IAC circuit open.
- Air inlet is plugged.
- B+ or VPWR to IAC solenoid open.
- Damaged or incorrect IAC valve.
- IAC valve stuck closed.
- VPWR to IAC solenoid open.
- IAC circuit shorted to PWR.
Diagnostic Aids:
Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve.
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
Vehicles With Electronic Throttle Control (ETC)
Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
All others
GO to KE1