The P2142: Exhaust Gas Recirculation (EGR) Throttle Control Circuit ‘A’ High refers to a high voltage condition in the EGR throttle control circuit ‘A’. This issue can result from a faulty EGR throttle control, wiring problems, or electrical faults, affecting the EGR system’s performance and emissions control.
P2142 – Quick Overview
Code | Information |
---|---|
Meaning | P2142: Exhaust Gas Recirculation Throttle Control Circuit ‘A’ High |
Is it serious? | Yes, it can cause EGR system malfunction, leading to increased emissions and drivability problems. |
Possible causes | – High voltage in the EGR throttle control circuit ‘A’ – Faulty EGR throttle control – Wiring issues |
How to diagnose? | – Measure voltage in the EGR throttle control circuit ‘A’ – Test the EGR throttle control – Inspect wiring and connections |
P2142 Meaning
The P2142 code indicates that the EGR throttle control circuit ‘A’ is experiencing higher-than-expected voltage. The EGR throttle control is essential for regulating the flow of exhaust gases into the engine. A high voltage can disrupt the EGR system’s operation, potentially leading to improper combustion, poor fuel efficiency, and increased emissions.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check for additional related codes, which could provide more context about the fault in the EGR system. | OBD-II Scanner |
Measure Voltage in Circuit ‘A’ | Use a multimeter to measure the voltage in the EGR throttle control circuit ‘A’. Compare the readings with the manufacturer’s specifications to determine if the voltage is too high. | Multimeter |
Test the EGR Throttle Control | Use a diagnostic tool to test the EGR throttle control for proper operation. Verify that it is functioning within the specified voltage range. Replace if faulty. | Diagnostic Tool |
Inspect Wiring and Connections | Visually inspect the wiring and connectors leading to the EGR throttle control ‘A’ for signs of damage, loose connections, or corrosion. Repair or replace as necessary. | Flashlight, Multimeter |
Check for Shorts or Open Circuits | Perform continuity tests on the wiring to check for any shorts or open circuits that could be causing high voltage in the circuit. | Multimeter, Wiring Diagram |
Clear the Code and Test Drive | After performing repairs or adjustments, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner |
Recheck for Codes | After the test drive, re-scan the vehicle to ensure that the P2142 code has not returned. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)