Exhaust Gas Recirculation Throttle Position Control Circuit
The P0487 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Throttle Position Control Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Rough idle
- Reduced engine performance
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Faulty EGR throttle position sensor Very High
- Carbon deposits restricting EGR throttle movement High
- Wiring issue in EGR throttle control circuit Moderate
- Failed EGR throttle actuator motor Moderate
Step-by-Step Diagnostic Procedure
-
Monitor EGR throttle position sensor voltage with a scan tool during commanded EGR operation
-
Inspect EGR throttle for free movement; check for carbon binding
-
Check wiring between ECM and EGR throttle position sensor for opens or shorts
-
Test EGR throttle actuator motor by applying voltage directly and observing movement
Frequently Asked Questions
What is the EGR throttle?
The EGR throttle is a separate throttle valve in the EGR system that controls the amount of exhaust gas recirculated back into the intake manifold. It works alongside the main EGR valve on some diesel and advanced gasoline engines.
Is P0487 common on diesel trucks?
Yes. P0487 is particularly common on diesel engines that use complex EGR systems with dedicated throttle valves. Carbon buildup from exhaust soot is a frequent cause on these vehicles.
Can I delete the EGR system to fix P0487?
Removing or disabling the EGR system is illegal under federal law in the United States and most other countries. It will also cause the vehicle to fail emissions testing. Repair or replace the faulty components instead.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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