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P1320 Buick Code - IC Module 4X Reference Circuit Intermittent No Pulses

Quick Answer

The P1320 diagnostic trouble code (DTC) for Buick vehicles specifically refers to an issue with the IC Module 4X Reference Circuit Intermittent No Pulses. Common causes include Faulty IC module, Wiring or connection issues in the 4X reference circuit, Defective crankshaft position sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1320 Buick indicates IC Module 4X Reference Circuit Intermittent No Pulses.
Common causes
Common causes include Faulty IC module, Wiring or connection issues in the 4X reference circuit, Defective crankshaft position sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1320 Buick Description

The P1320 diagnostic trouble code (DTC) for Buick vehicles specifically refers to an issue with the IC Module 4X Reference Circuit Intermittent No Pulses. This code indicates that the ignition control (IC) module is not receiving the expected input pulses from the 4X reference circuit intermittently. The IC module plays a crucial role in controlling the ignition system, timing, and overall engine performance. When this circuit is not functioning correctly, it can lead to misfires, poor engine performance, and potential long-term damage if left unresolved.

OBDII Code P1320 Buick - IC Module 4X Reference Circuit Intermittent No Pulses
P1320 Buick Code - IC Module 4X Reference Circuit Intermittent No Pulses

Common Causes of P1320 Buick

  1. Faulty IC module
  2. Wiring or connection issues in the 4X reference circuit
  3. Defective crankshaft position sensor
  4. Engine control module (ECM) malfunction
  5. Poor electrical grounding

Symptoms of P1320 Buick

  1. Engine misfires
  2. Rough idling
  3. Loss of power
  4. Engine stalling
  5. Check engine light illuminated

How to Fix P1320 Buick

  1. Diagnose the issue with a scan tool to confirm the P1320 code and pinpoint the exact cause.
  2. Inspect the wiring and connections in the 4X reference circuit for any damage or loose connections.
  3. Test the crankshaft position sensor to ensure it is functioning correctly.
  4. Replace the IC module if it is found to be faulty.
  5. Clear the trouble code, reset the ECM, and perform a road test to ensure the issue has been resolved.

Cost to Fix P1320 Buick

The typical repair costs for addressing a P1320 code on a Buick vehicle can vary depending on the specific cause of the issue. In general, replacing the IC module or addressing wiring and connection issues can range from $200 to $500 in parts and labor. Additional costs may apply if other components need to be replaced or if further diagnostics are required.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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