AutoCodes – GMC – P1262 GMC

P1262 GMC Code - Cylinder 2,3,5 and 8 High Voltage Circuit Fault

Quick Answer

The Fuel Injection Control Module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. Common causes include Faulty Fuel Injection Control Module (FICM), Fuel Injection Control Module (FICM) harness is open or shorted, Fuel Injection Control Module (FICM) 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: P1262 GMC indicates Cylinder 2,3,5 and 8 High Voltage Circuit Fault.
Common causes: Common causes include Faulty Fuel Injection Control Module (FICM), Fuel Injection Control Module (FICM) harness is open or shorted, Fuel Injection Control Module (FICM) 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 608

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 Mar 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1262 GMC Description

The Fuel Injection Control Module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, all of the fuel injectors on the affected ignition voltage circuit will be disabled. If a circuit condition is detected on a fuel injector circuit for cylinders 2, 3, 5, or 8, Diagnostic Trouble Code (DTC)s P0202, P0203, P0205, P0208 will set, along with DTC P1262.

OBDII Code P1262 GMC - Cylinder 2,3,5 and 8 High Voltage Circuit Fault - AutoCodes.com — P1262 GMC Code - Cylinder 2,3,5 and 8 High Voltage Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P1262 GMC?

Faulty Fuel Injection Control Module (FICM)
Fuel Injection Control Module (FICM) harness is open or shorted
Fuel Injection Control Module (FICM) circuit poor electrical connection

How to Fix the DTC P1262 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 P1262 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 P1262 GMC code?

Need more information on how to fix the P1262 GMC code? Get Access to Factory Service Manuals

Need Help with the 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.

Frequently Asked Questions about P1262 GMC Code

1. What are the common symptoms of OBDII code P1262 GMC (Cylinder 2,3,5 and 8 High Voltage Circuit Fault)?

- Common symptoms include rough idling, misfiring, loss of power, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P1262 GMC?

- The code P1262 GMC is typically caused by issues such as faulty ignition coils, damaged spark plugs, wiring problems, or a failing powertrain control module (PCM).

3. How can I diagnose the Cylinder 2,3,5 and 8 High Voltage Circuit Fault?

- Diagnosis involves using a scan tool to read the OBDII code, checking the ignition coils, inspecting the spark plugs, and testing the wiring for any faults or damages.

4. Can I continue driving with OBDII code P1262 GMC present?

- It is not recommended to continue driving with this code present, as it can lead to further engine damage and decreased performance.

5. How can I repair OBDII code P1262 GMC?

- Repair options include replacing faulty ignition coils, installing new spark plugs, repairing damaged wiring, or replacing the PCM if necessary.

6. Are there any DIY tips for fixing the Cylinder 2,3,5 and 8 High Voltage Circuit Fault?

- DIY enthusiasts can attempt to replace the ignition coils and spark plugs themselves, following the vehicle's repair manual for guidance.

7. How much does it typically cost to repair OBDII code P1262 GMC?

- The cost of repair can vary depending on the extent of the issue and the parts needed, but it can range from $200 to $800 at a repair shop.

8. What should I do if OBDII code P1262 GMC keeps coming back after repairs?

- If the code persists after repairs, further diagnosis may be needed to identify any underlying issues that were not initially addressed.

9. Can a mechanic reset the Check Engine Light after fixing the Cylinder 2,3,5 and 8 High Voltage Circuit Fault?

- Yes, a mechanic can reset the Check Engine Light using a scan tool once the underlying issue triggering the code has been resolved.

10. How often should I check for OBDII code P1262 GMC in my GMC vehicle?

- It is advisable to regularly monitor your vehicle for any signs of engine trouble, such as rough idling or loss of power, and promptly address any detected issues to prevent the code from recurring.