P0268 GMC Code - Cylinder 3 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 3, Faulty Fuel Injector 3, Plugged Fuel Injector 3. 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
- P0268 GMC indicates Cylinder 3 Injector Control Circuit High Voltage.
- Common causes
- Common causes include Dirty Fuel Injector 3, Faulty Fuel Injector 3, Plugged Fuel Injector 3.
- 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.
Code P0268 GMC Description
What are the Possible Causes of the DTC P0268 GMC?
- Dirty Fuel Injector 3
- Faulty Fuel Injector 3
- Plugged Fuel Injector 3
- Fuel Injector #3 harness is open or shorted
- Fuel Injector #3 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0268 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0268 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.
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Information for Specific GMC Models
- P0268 2014 GMC Sierra — Cylinder 3 Injector Control Circuit High Voltage
- P0268 2015 GMC Sierra — Cylinder 3 Injector Control Circuit High Voltage
- P0268 2016 GMC Sierra — Cylinder 3 Injector Control Circuit High Voltage
- P0268 2017 GMC Sierra — Cylinder 3 Injector Control Circuit High Voltage
- P0268 2018 GMC Sierra — Cylinder 3 Injector Control Circuit High Voltage
Frequently Asked Questions about P0268 GMC Code
What does the OBDII code P0268 mean for a GMC vehicle?
P0268 indicates that the voltage in the control circuit for cylinder 3's fuel injector is higher than expected, suggesting an electrical issue.
What are the common symptoms of code P0268 on a GMC?
Symptoms may include poor engine performance, rough idling, misfires, reduced fuel efficiency, and the check engine light turning on.
What causes the P0268 code to appear in GMC vehicles?
Common causes include a faulty fuel injector, wiring issues like shorts or damaged insulation, or a malfunctioning engine control module (ECM).
Can a dirty fuel injector cause code P0268?
No, a dirty injector typically causes fuel flow issues, not high voltage. This code usually points to an electrical problem in the injector circuit.
How can I diagnose code P0268 on my GMC?
Start by inspecting the wiring and connectors for cylinder 3's injector. Use a multimeter to check for high voltage, and test the injector for proper operation.
Is it safe to drive a GMC with code P0268?
Driving with this code is not recommended as it can lead to engine misfires, increased emissions, and potential damage to other components.
How do I fix code P0268 on a GMC vehicle?
Repairs may involve replacing the injector, repairing or replacing damaged wiring, or reprogramming or replacing the ECM if necessary.
Can a bad ECM cause the P0268 code on a GMC?
Yes, a malfunctioning ECM can send incorrect voltage signals to the injector, triggering the P0268 code.
How much does it cost to repair code P0268 in a GMC?
Repair costs vary but may range from $100 to $500, depending on whether the injector, wiring, or ECM needs replacement.
What tools are needed to troubleshoot code P0268 on a GMC?
You’ll need an OBDII scanner, multimeter, and possibly specialized tools to test or replace the injector.
Discuss the causes and fixes for P0268 GMC OBDII Code
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