Exhaust Gas Recirculation Throttle Position Control Range/Performance
The P0488 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Throttle Position Control Range/Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- EGR system not functioning correctly
- Rough idle conditions
- Increased NOx emissions
Probable Causes (Ranked by Likelihood)
- EGR throttle stuck or binding from carbon deposits Very High
- EGR throttle actuator wearing out High
- EGR throttle position sensor out of calibration Moderate
- Exhaust back-pressure affecting EGR throttle operation Low
Frequently Asked Questions
What does range/performance mean for P0488?
Range/performance means the EGR throttle is operating but not achieving the expected position within the expected time. The ECM commands a position and the actual position deviates beyond the acceptable tolerance.
How do I clean the EGR throttle?
Remove the EGR throttle assembly and soak it in EGR-safe carbon cleaner. Use a soft brush to remove deposits. Do not use abrasive tools that could damage the throttle bore or plate. Reassemble and perform a throttle relearn procedure.
Can P0488 cause engine damage?
P0488 itself will not cause engine damage, but improper EGR operation can lead to increased combustion temperatures and higher NOx emissions. Over time, this can contribute to premature catalytic converter degradation.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Command the EGR throttle through its full range and monitor actual vs commanded position
-
Remove and inspect the EGR throttle for carbon buildup and mechanical binding
-
Check EGR throttle position sensor output across the full range of motion for dead spots or erratic readings
-
Verify exhaust back-pressure is within specification as excessive pressure can affect throttle operation
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P0488 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Commonly Affected Vehicles
- 2011-2020 Ford F-350 6.7L Powerstroke
- 2010-2019 Ram 3500 6.7L Cummins
- 2012-2020 GMC Sierra 6.6L Duramax
- 2014-2020 Chevrolet Colorado 2.8L Diesel
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.