P0487 - EGR Throttle Control Circuit Open
The P0487 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the Exhaust Gas Recirculation (EGR) throttle control circuit. This circuit controls the EGR throttle actuator, which regulates the flow of exhaust gases back into the intake manifold to reduce NOx emissions. An open circuit means there is a break in the electrical path, preventing the actuator from functioning properly. This can lead to increased emissions, reduced engine performance, and potential drivability issues.
01. Most Common Causes
- Faulty EGR throttle actuator
- Open or shorted wiring in the EGR throttle control circuit
- Corroded or loose electrical connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or stalling
- Reduced engine power
- Increased fuel consumption
- Failed emissions test
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 and its wiring harness for damage, corrosion, or loose connections.
Step 3: Test the EGR throttle actuator circuit using a multimeter to check for continuity and proper voltage.
Step 4: If the circuit is open, repair or replace the damaged wiring or connector.
Step 5: If wiring is intact, test the EGR throttle actuator itself; replace if faulty.
Step 6: Clear the code and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause reduced engine performance, stalling, and increased emissions. You may be able to drive short distances to a repair shop, but it's best to address the issue promptly.
How much does it cost to fix?▼
The cost to fix P0487 typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. Replacing an EGR throttle actuator can cost $100-$300, while wiring repairs are usually less expensive.