IC Module 4X Reference Circuit Intermittent No Pulses
2004-2007 Buick Rainier 4.2L I6
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
- Scope 4X reference signal
- Test crankshaft position sensor
- Inspect wiring for damage
- Check IC module connections
- Test distributor pickup (if equipped)
Repair Notes
Check crankshaft position sensor and wiring. Replace IC module if signal is intermittent at module.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1320 on Other Vehicles
Common Questions
What does code P1320 mean on a 2004-2007 Buick Rainier?
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 Buick Rainier?
Common symptoms of P1320 include: Check Engine Light, Intermittent misfires, Engine stalling, No start (intermittent), Rough running.
What causes P1320 on a 2004-2007 Buick Rainier?
Common causes of P1320 include: Faulty crankshaft position sensor, Damaged 4X reference signal wiring, Ignition control module failure, Loose distributor (older engines), Corroded connector.