Exhaust Gas Recirculation Throttle Control Circuit High
What does P2142 mean?
The P2142 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Throttle Control Circuit High. This is a moderate severity code.
Common Symptoms
- Engine performance reduced
- Higher than normal emissions
- Possible rough idle
- EGR system not functioning properly
- Check engine light on
Probable Causes (Ranked by Likelihood)
- EGR throttle control valve circuit open or shorted to voltage Very High
- Disconnected EGR throttle control valve connector High
- Faulty EGR throttle control valve (open coil) Moderate
- Wiring damage causing open circuit Moderate
- PCM EGR driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Verify EGR throttle control valve connector is properly connected
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Measure EGR control circuit voltage -- should not be stuck at battery voltage or 5V
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Test EGR valve coil resistance -- compare to manufacturer specification
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Check wiring for open circuits between PCM and EGR valve
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Replace EGR throttle control valve if coil is open or resistance is out of spec
Frequently Asked Questions
Can I drive with code P2142?
Yes, but with potentially reduced performance and higher emissions. The EGR system will not function correctly, which may cause the vehicle to fail emissions testing. Schedule a repair at your convenience.
What does circuit high mean for the EGR throttle?
Circuit high means the PCM detects higher than expected voltage on the EGR throttle control circuit. This usually indicates an open coil in the valve, a disconnected connector, or an open wire in the control circuit.
Can carbon buildup cause this code?
Excessive carbon buildup can jam the EGR throttle valve, which may cause the motor to overheat and eventually burn out its coil winding. While carbon does not directly cause the electrical fault, it can lead to conditions that cause the valve to fail.