What are the symptoms of P0488?

Common symptoms include: Rough running; Regen problems; Reduced power.

What causes a P0488 code?

The most common causes are: Carboned intake throttle valve; Throttle actuator fault; Wiring issue.

How do you fix P0488?

Clean the intake throttle body/valve; Command the throttle and watch position; Replace the actuator if needed. Worth diagnosing soon — left alone, the underlying issue can grow into a bigger, costlier problem.

OBD-II Code Lookup

P0488Watch

EGR Throttle Position Control Range/Performance

Emissions system

The intake/EGR throttle valve (used to drive EGR flow and aid regen) isn't reaching its commanded position — typically carbon on the throttle plate.

Worth diagnosing soon — left alone, the underlying issue can grow into a bigger, costlier problem.

Common symptoms

Rough running
Regen problems
Reduced power

Common causes

Carboned intake throttle valve
Throttle actuator fault
Wiring issue

How it's diagnosed & fixed

Clean the intake throttle body/valve
Command the throttle and watch position
Replace the actuator if needed

Got P0488? Get it diagnosed.

A real technician can interpret P0488 in the context of your truck and symptoms — and tell you what's actually wrong before you buy parts.

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Related Emissions codes

P0401EGR Flow Insufficient Detected P0402EGR Flow Excessive Detected P0404EGR Control Circuit Range/Performance P0420Catalyst System Efficiency Below Threshold (Bank 1)

Reference only. A trouble code names a symptom, not the failed part — always confirm with a live diagnosis before repairs. See our Knowledge Base for deeper guides.