AutoCodes – GMC – P1321 GMC

P1321 GMC Code - Electronic Ignition System Fault Line

Quick Answer

P1321 GMC indicates Electronic Ignition System Fault Line. Common causes include Faulty Ignition Coil, Ignition Coil harness is open or shorted, Ignition Coil circuit poor electrical connection. 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: P1321 GMC indicates Electronic Ignition System Fault Line.
Common causes: Common causes include Faulty Ignition Coil, Ignition Coil harness is open or shorted, Ignition Coil circuit poor electrical connection.
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.

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Code Popularity 6,543

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1321 GMC Description

OBDII Code P1321 GMC - Electronic Ignition System Fault Line - AutoCodes.com — P1321 GMC Code - Electronic Ignition System Fault Line

What does this mean?

What are the Possible Causes of the DTC P1321 GMC?

Faulty Ignition Coil
Ignition Coil harness is open or shorted
Ignition Coil circuit poor electrical connection

How to Fix the DTC P1321 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1321 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1321 GMC code?

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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.