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AutoCodes – GMC – P0262 GMC

P0262 GMC Code - Cylinder 1 Injector Control Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. Common causes include Dirty Fuel Injector 1, Faulty Fuel Injector 1, Plugged Fuel Injector 1. 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
P0262 GMC indicates Cylinder 1 Injector Control Circuit High Voltage.
Common causes
Common causes include Dirty Fuel Injector 1, Faulty Fuel Injector 1, Plugged Fuel Injector 1.
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 436
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 23, 2024
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Code P0262 GMC Description

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector control circuit is shorted to voltage for greater than 2 s.
OBDII Code P0262 GMC - Cylinder 1 Injector Control Circuit High Voltage - AutoCodes.com
P0262 GMC Code - Cylinder 1 Injector Control Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P0262 GMC?

  • Dirty Fuel Injector 1
  • Faulty Fuel Injector 1
  • Plugged Fuel Injector 1
  • Fuel Injector #1 harness is open or shorted
  • Fuel Injector #1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0262 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 does this mean?

Code Tech Notes

A clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0262 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 P0262 GMC code?

Need more information on how to fix the P0262 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0262 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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.

Frequently Asked Questions about P0262 GMC Code

1. What does the OBDII code P0262 mean for a GMC vehicle?

P0262 indicates that the Engine Control Module (ECM) has detected a high voltage condition in the injector control circuit for cylinder 1.

2. What are the common symptoms of a P0262 code?

Symptoms may include rough idling, misfiring in cylinder 1, reduced engine performance, poor fuel economy, and an illuminated Check Engine Light.

3. What causes the P0262 code in a GMC vehicle?

Common causes include a shorted fuel injector, damaged wiring or connectors in the injector circuit, a faulty injector driver in the ECM, or excessive fuel pressure.

4. Can I drive my GMC with a P0262 code?

Driving with a P0262 code is not recommended as it may lead to engine misfires, reduced performance, and potential long-term damage to the engine or catalytic converter.

5. How is the P0262 code diagnosed?

A technician will inspect the injector wiring and connectors for damage, test the cylinder 1 fuel injector with a multimeter, and check the ECM for proper functioning.

6. How do you fix a P0262 code on a GMC?

Fixes may include repairing or replacing damaged wiring, cleaning or replacing the cylinder 1 fuel injector, or, in rare cases, replacing the ECM if the injector driver is faulty.

7. Can a dirty fuel injector cause the P0262 code?

While a dirty injector typically causes flow issues rather than high voltage, it’s possible that internal electrical faults in the injector could trigger this code.

8. What tools are needed to diagnose and repair a P0262 code?

Tools may include an OBDII scanner, a multimeter to test electrical circuits, and, if necessary, specialized tools to remove and replace the fuel injector.

9. How much does it cost to fix a P0262 code in a GMC?

Repair costs vary depending on the root cause but can range from $100 for wiring repairs to $300-$700 or more for injector replacement or ECM repair.

10. Can a weak battery cause the P0262 code?

A weak battery is unlikely to cause this specific code, but electrical issues elsewhere in the system could contribute to injector circuit problems.

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