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Home/DTC Codes/GMC/Envoy/2002-2009 4.2L I6/P1320
P1320

IC Module 4X Reference Circuit Intermittent No Pulses

2002-2009 GMC Envoy 4.2L I6 🇨🇦

High SeverityPowertrain

Description

The PCM detected intermittent loss of the 4X reference signal from the ignition control module. The 4X reference provides crankshaft position timing information for spark delivery.

Symptoms

  • Check Engine Light
  • Intermittent misfires
  • Engine stalling
  • No start (intermittent)
  • Rough running

Common Causes

  • Faulty crankshaft position sensor
  • Damaged 4X reference signal wiring
  • Ignition control module failure
  • Loose distributor (older engines)
  • Corroded connector

Diagnostic Steps

  1. Scope 4X reference signal
  2. Test crankshaft position sensor
  3. Inspect wiring for damage
  4. Check IC module connections
  5. Test distributor pickup (if equipped)

Repair Notes

Check crankshaft position sensor and wiring. Replace IC module if signal is intermittent at module.

Related Codes

P0335Crankshaft Position Sensor A CircuitP0336Crankshaft Position Sensor A Circuit Range/PerformanceP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor REFP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor CircuitP1335Crankshaft Position Sensor IFI MalfunctionP1335No Crankshaft Position Sensor SignalP1335No Crankshaft Position Sensor SignalP1335Crankshaft Position Sensor REFP1335Crankshaft Position Sensor CircuitP1335No Crankshaft Position Sensor SignalP1335Crankshaft Position Sensor CircuitP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many PulsesP1370IC Module 4X Reference Circuit Too Many Pulses

Other Powertrain Codes

P1320 on Other Vehicles

GMC Acadia

2017-2024 2.5L I4

GMC Acadia

2017-2024 3.6L V6

GMC Canyon

2004-2012 2.8L I4

GMC Canyon

2004-2012 3.5L I5

GMC Canyon

2007-2012 2.9L I4

GMC Canyon

2007-2012 3.7L I5

GMC Canyon

2015-2022 3.6L V6

GMC Canyon

2023-2024 2.7L I4 Turbo

Common Questions

What does code P1320 mean on a 2002-2009 GMC Envoy?

P1320 stands for "IC Module 4X Reference Circuit Intermittent No Pulses". The PCM detected intermittent loss of the 4X reference signal from the ignition control module. The 4X reference provides crankshaft position timing information for spark delivery.

What are the symptoms of P1320 on a GMC Envoy?

Common symptoms of P1320 include: Check Engine Light, Intermittent misfires, Engine stalling, No start (intermittent), Rough running.

What causes P1320 on a 2002-2009 GMC Envoy?

Common causes of P1320 include: Faulty crankshaft position sensor, Damaged 4X reference signal wiring, Ignition control module failure, Loose distributor (older engines), Corroded connector.

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