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P1633 – Battery Voltage Too Low (Keep Alive Memory)

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Symptoms

  • Clock resets
  • Rough idle

Causes

  • Weak battery
  • Bad ground
  • Wiring issue

Diagnosis

  • Measure voltage
  • Inspect grounds
  • Check wiring

Repair

  • Replace battery
  • Repair wiring
  • Improve grounding
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