P1235 GMC Code - Injector 5 Output Circuit
Quick Answer
The P1235 GMC code indicates a problem with the injector 5 output circuit in the vehicle's engine control module (ECM). Common causes include Faulty wiring or connectors, Short circuit in the injector 5 output circuit, Open circuit in the injector 5 output circuit. 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
- P1235 GMC indicates Injector 5 Output Circuit.
- Common causes
- Common causes include Faulty wiring or connectors, Short circuit in the injector 5 output circuit, Open circuit in the injector 5 output circuit.
- 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 P1235 GMC Description
The P1235 GMC code indicates a problem with the injector 5 output circuit in the vehicle's engine control module (ECM). The fuel injector is responsible for delivering fuel into the combustion chamber of the engine at the precise time and in the correct amount. When this code is triggered, it means that there is an issue with the electrical circuit that controls the operation of injector 5.
Common Causes of P1235 GMC
- Faulty wiring or connectors
- Short circuit in the injector 5 output circuit
- Open circuit in the injector 5 output circuit
- Corrosion in the connections
- Faulty injector or ECM
Symptoms of P1235 GMC
- Engine misfires
- Loss of power
- Rough idling
- Poor fuel efficiency
- Engine stalling or failing to start
How to Fix P1235 GMC
- Diagnose the issue by using a scan tool to identify the specific cause of the problem.
- Inspect the wiring and connectors for any signs of damage, corrosion, or loose connections.
- Test the injector 5 output circuit for continuity and voltage to determine if it is functioning properly.
- Replace any faulty wiring, connectors, or the injector itself if necessary.
- Clear the trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1235 GMC
The typical repair costs for addressing a P1235 GMC code can vary depending on the exact cause of the issue and the specific vehicle. On average, the parts and labor for this repair could range from $200 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local shops for a more accurate estimate.
Tech Notes for P1235 GMC
There is a factory service bulletin for the following models:
2004 GMC Sierra
2005 GMC Sierra
2004 GMC Topkick
2005 GMC Topkick
2004-2005 GMC Sierra, Topkick Factory Service Bulletin OBDII Code P1235
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