AutoCodes – GMC – P1222 GMC

P1222 GMC Code - Injector Control Circuit 1 Intermittent

Quick Answer

With the engine running, then the Powertrain Control Module (PCM) detects the wrong voltage potential on one of the injector drive circuits for under 500 ms. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P1222 GMC indicates Injector Control Circuit 1 Intermittent.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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 4,498

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 Jul 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1222 GMC Description

With the engine running, then the Powertrain Control Module (PCM) detects the wrong voltage potential on one of the injector drive circuits for under 500 ms. Also the P0200 code will set if a fault in a component or circuit is detected.

OBDII Code P1222 GMC - Injector Control Circuit 1 Intermittent - AutoCodes.com — P1222 GMC Code - Injector Control Circuit 1 Intermittent

What does this mean?

What are the Possible Causes of the DTC P1222 GMC?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection

How to Fix the DTC P1222 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 P1222 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 P1222 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.