Code Definition

P0488 — EGR throttle control short or open circuit 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0488

P0488 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0488 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0488 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Powertrain Control Module (PCM) sets this code when it detects an open or short circuit in the EGR throttle control circuit (Circuit 1). This circuit controls the EGR throttle valve, which regulates airflow to improve EGR efficiency. A failure in the circuit can lead to improper EGR operation, affecting engine performance and emissions.

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