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 in the wiring or connector.
1. Most Common Causes
- Short to power in EGR throttle control circuit
- Faulty EGR throttle actuator
- Open or shorted wiring/connectors
- Failed ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine performance
- Rough idle or stalling
- Increased emissions
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm code P2142.
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 for high voltage using a multimeter (compare to manufacturer specs).
Step 4: If wiring is OK, test the actuator resistance and operation; replace if out of spec.
Step 5: Clear code and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential stalling. Seek repair soon.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for diagnostic and minor wiring repairs, or up to $300 if the EGR throttle actuator needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.