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2000 CHEVROLET IMPALA
3.8L V6•FWD•AUTOMATIC•gas
10 active safety recalls on this vehicle — view recalls
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Repairs0Labor493Torque4212Fluid7DTC1003Battery1Maintenance0Recalls10
P1370moderate severityPowertrain

IC Module 4X Reference Circuit Too Many Pulses

on 2000 Chevrolet Impala 3.8L V6 · FWD

What this code means

The PCM detected too many pulses from the 4X reference signal in the ignition control circuit. This can be caused by electrical noise or a failing component.

Symptoms

  • Check Engine Light
  • Engine misfires
  • Timing issues
  • Rough running

Common causes

  • Damaged crankshaft reluctor wheel (extra material)
  • Electrical noise in 4X circuit
  • Faulty ignition control module
  • Wiring interference

Diagnostic steps

  1. Scope 4X reference signal for extra pulses
  2. Inspect crankshaft reluctor wheel
  3. Check wiring for electromagnetic interference
  4. Test IC module

Repair notes

Inspect reluctor wheel for damage. Shield wiring from interference sources. Replace IC module if faulty.

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