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2002 VOLVO S80
2.9L I6•FWD•AUTOMATIC•gas•B6294S
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor501Torque3163Fluid7DTC859Battery1Maintenance0Recalls5
P0601high severityPowertrain

Internal Control Module Memory Check Sum Error

on 2002 Volvo S80 2.9L I6 · FWD

What this code means

The PCM has detected a memory checksum error during self-test.

Symptoms

  • Check Engine Light
  • Erratic engine behavior
  • Possible no-start
  • Multiple system faults

Common causes

  • PCM internal failure
  • PCM programming corruption
  • Voltage spike damage
  • Water intrusion into PCM

Diagnostic steps

  1. Attempt PCM reprogramming/reflash
  2. Check for water damage to PCM
  3. Test PCM power and ground circuits
  4. Check for TSBs regarding PCM update

Repair notes

Reprogram PCM first. If error persists, replace PCM.

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