EGR Throttle Control Circuit High Voltage
The P2142 code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the Exhaust Gas Recirculation (EGR) throttle control circuit. This circuit controls the EGR throttle actuator, which regulates exhaust gas flow into the intake manifold. A high voltage reading typically suggests a short to power, a faulty actuator, or an open circuit. This can lead to improper EGR operation, affecting engine performance and emissions.
01. Most Common Causes
- Short to power in the EGR throttle control circuit
- Faulty EGR throttle actuator
- Damaged wiring or connectors
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Rough idle or stalling
- Increased emissions
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the EGR throttle actuator wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the EGR throttle actuator circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts to power or ground in the circuit.
Step 5: If wiring is intact, test the actuator resistance and operation; replace if faulty.
Step 6: Clear the code and test drive to see if it returns.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced engine performance and increased emissions. You may experience stalling or hesitation, which can be dangerous.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing the EGR throttle actuator can cost $100-$300 including parts and labor.