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2022 CHEVROLET BOLT EUV
65 kWh Single Motor FWD•FWD•AUTOMATIC•ev
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor314Torque3680Fluid5DTC1608Battery1Maintenance0Recalls4
P0439low severityPowertrain

Catalyst Heater Control Circuit (Bank 2)

on 2022 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD

What this code means

There is a fault in the catalyst heater control circuit on bank 2. The heater helps the converter reach operating temperature quickly for emissions.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Higher emissions on cold start

Common causes

  • Faulty catalyst heater element
  • Wiring or connector damage
  • Blown fuse or relay
  • Bad PCM

Diagnostic steps

  1. Retrieve code and freeze frame
  2. Inspect heater circuit wiring and fuse
  3. Test heater element resistance
  4. Repair circuit or replace component
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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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