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2022 CHEVROLET TRAILBLAZER
1.3L I3 Turbo•AWD•AUTOMATIC•gas•turbo
1 active safety recall on this vehicle — view recalls
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Repairs0Labor478Torque1498Fluid9DTC2017Battery1Maintenance0Recalls1
P0407moderate severityPowertrain

Exhaust Gas Recirculation Sensor B Circuit Low

on 2022 Chevrolet TrailBlazer 1.3L I3 Turbo · AWD

What this code means

The PCM detects a low voltage signal from EGR sensor B. This can reduce EGR control accuracy and increase emissions.

Symptoms

  • Check engine light on
  • Rough idle
  • Increased NOx emissions

Common causes

  • Faulty EGR position sensor B
  • Short to ground in wiring
  • Corroded connector
  • Failed PCM input circuit

Diagnostic steps

  1. Scan and record freeze frame
  2. Backprobe EGR sensor B signal voltage
  3. Inspect wiring for short to ground
  4. Replace EGR sensor or repair harness
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