Error code

OBD2 P0488

OBD2P0488
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Exhaust Gas Recirculation Throttle Position Control Range/Performance.

Severity

moderateCan drive, but rough idle may occur.

Summary

P0488 indicates an issue with the exhaust gas recirculation (EGR) system's throttle position control range or performance, specifically related to discrepancies between the actual and desired EGR valve positions.

Symptoms

  • No symptoms may be present
  • Rough idle or engine stall at idle if the EGR valve is stuck open

Common Causes

  • Clogged EGR passages
  • Defective EGR valve
  • Faulty EGR sensor or sensor hoses
  • Open or shorted EGR or TPS circuits/connectors
  • Misadjusted throttle position sensor (TPS)

Diagnosis

  1. Inspect and test EGR system efficiency using a diagnostic scanner and hand-held vacuum pump.
  2. Check TPS signal voltage with a digital volt/ohmmeter (DVOM).

Fixes

  • Clean or replace clogged EGR passages
  • Replace defective EGR valve

FAQ

What should I do if the P0488 code is accompanied by other TPS codes?

Test the throttle position sensor (TPS) signal voltage and replace it if faulty.

How can I test the EGR valve for functionality?

Use a hand-held vacuum pump to apply vacuum to the EGR valve while observing engine response.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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