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2018 CHEVROLET SILVERADO 1500
5.3L V8 EcoTec3 L83•RWD•AUTOMATIC•gas
7 active safety recalls on this vehicle — view recalls
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Repairs421Labor498Torque4352Fluid8DTC1708Battery1Maintenance0Recalls7
P0490moderate severityPowertrain

EGR Control Circuit High

on 2018 Chevrolet Silverado 1500 5.3L V8 EcoTec3 L83 · RWD

What this code means

The PCM has detected a high voltage condition in the EGR control circuit. This may indicate an open circuit or wiring fault affecting EGR operation.

Symptoms

  • Check engine light on
  • Rough idle
  • Increased emissions

Common causes

  • Open circuit in wiring
  • Faulty EGR valve
  • Corroded connector
  • Faulty PCM

Diagnostic steps

  1. Scan for stored codes
  2. Check EGR control circuit voltage
  3. Inspect wiring for opens
  4. Test EGR valve operation
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