P1100 2018 GMC Sierra Code - Fuel Level Sensor 2 Signal Message Counter Incorrect
Quick Answer
The signal circuit is connected to the Fuel Pump Driver Control Module, and the Fuel Pump Driver Control Module communicates with the Engine Control Module (ECM) via serial data. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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
- P1100 2018 GMC Sierra indicates Fuel Level Sensor 2 Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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.
Code P1100 2018 GMC Sierra Description
What are the Possible Causes of the DTC P1100 2018 GMC Sierra?
- Faulty Fuel Pump Driver Control Module
- Fuel Pump Driver Control Module harness is open or shorted
- Fuel Pump Driver Control Module circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1100 2018 GMC Sierra?
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 P1100 2018 GMC Sierra 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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Frequently Asked Questions about P1100 2018 GMC Sierra Code
1. What does the OBDII code P1100 mean on a 2018 GMC Sierra?
The P1100 code indicates an issue with the Fuel Level Sensor 2 Signal Message Counter being incorrect, meaning the data sent by the secondary fuel level sensor is not being processed correctly by the vehicle’s computer.
2. What are the symptoms of code P1100 on a 2018 GMC Sierra?
Common symptoms include incorrect fuel level readings, an illuminated check engine light, reduced fuel efficiency, or erratic fuel gauge behavior.
3. What causes the P1100 code on a 2018 GMC Sierra?
Potential causes include a faulty fuel level sensor, damaged wiring or connectors, a malfunctioning fuel pump module, or a software issue in the vehicle’s control module.
4. Can I drive my 2018 GMC Sierra with a P1100 code?
While the vehicle may still be drivable, the incorrect fuel level readings could lead to running out of fuel unexpectedly, so it’s best to address the issue promptly.
5. How is the P1100 code diagnosed on a 2018 GMC Sierra?
A technician will use a scan tool to monitor the fuel level sensor data, inspect wiring and connectors for damage, and possibly perform continuity tests to determine the root cause.
6. How do you fix the P1100 code on a 2018 GMC Sierra?
Repairs may include replacing the faulty fuel level sensor, repairing or replacing damaged wiring or connectors, updating the control module software, or replacing the fuel pump module if necessary.
7. What is the fuel level sensor 2 on a 2018 GMC Sierra?
The fuel level sensor 2 is part of the fuel system that measures the amount of fuel in the secondary fuel tank or the secondary portion of a split fuel system, depending on the model configuration.
8. How much does it cost to fix the P1100 code on a 2018 GMC Sierra?
Repair costs vary depending on the issue but typically range from $150 to $500, including parts and labor, with more extensive repairs like fuel pump replacement costing more.
9. Can a P1100 code on a 2018 GMC Sierra be caused by a software issue?
Yes, outdated or corrupted software in the vehicle’s control module can sometimes cause this code, and a software update may be needed.
10. Is a P1100 code specific to GMC Sierra trucks?
No, the P1100 code can appear on other vehicles, but its definition and specifics may vary; on the 2018 GMC Sierra, it specifically refers to the Fuel Level Sensor 2 Signal Message Counter.
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