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2002 TOYOTA HIGHLANDER
2.4L I4•AWD•AUTOMATIC•gas•2AZ-FE
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor485Torque3340Fluid10DTC1720Battery1Maintenance0Recalls2
P0603moderate severityPowertrain

Internal Control Module Keep Alive Memory (KAM) Error

on 2002 Toyota Highlander 2.4L I4 · AWD

What this code means

The PCM detected a fault with its Keep Alive Memory, which stores learned values and adaptations. This is usually caused by loss of battery voltage or an internal module fault.

Symptoms

  • Check engine light on
  • Loss of learned idle/fuel trims
  • Rough running after battery disconnect

Common causes

  • Weak or disconnected battery
  • Corroded battery/ground connections
  • Faulty PCM internal memory
  • Poor wiring to constant power circuit

Diagnostic steps

  1. Check battery voltage and connections
  2. Inspect PCM constant power and ground circuits
  3. Clear code and retest for return
  4. Reflash or replace PCM if fault persists
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