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2017 CHEVROLET SILVERADO 1500
5.3L V8 EcoTec3 L83•RWD•AUTOMATIC•gas
6 active safety recalls on this vehicle — view recalls
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Repairs421Labor498Torque4352Fluid8DTC2010Battery1Maintenance0Recalls6
P2097moderate severityPowertrain

Post Catalyst Fuel Trim System Too Rich (Bank 1)

on 2017 Chevrolet Silverado 1500 5.3L V8 EcoTec3 L83 · RWD

What this code means

The downstream oxygen sensor detects the exhaust running too rich after the catalytic converter. This often stems from excess fuel or a faulty sensor reading.

Symptoms

  • Check engine light on
  • Black smoke or fuel smell
  • Poor fuel economy

Common causes

  • Leaking or stuck-open fuel injector
  • High fuel pressure
  • Faulty downstream oxygen sensor
  • Contaminated or failing catalytic converter

Diagnostic steps

  1. Scan and review fuel trim values
  2. Check fuel pressure against spec
  3. Inspect injectors for leakage
  4. Test downstream O2 sensor response
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