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2001 GMC SAVANA
4.3L V6•RWD•gas•L35
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Repairs0Labor505Torque139Fluid8DTC1764Battery1Maintenance0Recalls0
P1173moderate severityPowertrain

System Lean Bank 1

on 2001 GMC Savana 4.3L V6 · RWD

What this code means

The fuel control system detects an overly lean condition on bank 1. This is a GM-specific code related to generic P0171 lean fault.

Symptoms

  • Check engine light on
  • Hesitation on acceleration
  • Rough idle

Common causes

  • Vacuum or intake leak
  • Weak fuel delivery
  • Dirty MAF sensor
  • Faulty O2 sensor

Diagnostic steps

  1. Scan and record fuel trim data
  2. Check for intake and vacuum leaks
  3. Test fuel pressure
  4. Inspect MAF and O2 sensors
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