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P1100 2015 GMC Sierra Code - Fuel Level Sensor 2 Signal Message Counter Incorrect

Quick Answer

The P1100 code for a 2015 GMC Sierra indicates that there is an issue with the Fuel Level Sensor 2 Signal Message Counter being incorrect. Common causes include Faulty fuel level sensor, Wiring issues in the sensor circuit, Malfunctioning ECM. 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 2015 GMC Sierra indicates Fuel Level Sensor 2 Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel level sensor, Wiring issues in the sensor circuit, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 21, 2024
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Code P1100 2015 GMC Sierra Description

The P1100 code for a 2015 GMC Sierra indicates that there is an issue with the Fuel Level Sensor 2 Signal Message Counter being incorrect. This sensor is responsible for monitoring the fuel level in the vehicle's tank and sending this information to the engine control module (ECM). When the signal message counter is incorrect, it means that the ECM is not receiving accurate data from the fuel level sensor, which can lead to various performance issues.

OBDII Code P1100 2015 GMC Sierra - Fuel Level Sensor 2 Signal Message Counter Incorrect
P1100 2015 GMC Sierra Code - Fuel Level Sensor 2 Signal Message Counter Incorrect

Common Causes of P1100 2015 GMC Sierra

  1. Faulty fuel level sensor
  2. Wiring issues in the sensor circuit
  3. Malfunctioning ECM
  4. Software glitch in ECM programming

Symptoms of P1100 2015 GMC Sierra

  1. Inaccurate fuel gauge readings
  2. Engine running too rich or too lean
  3. Poor fuel economy
  4. Rough idling
  5. Engine stalling

How to Fix P1100 2015 GMC Sierra

  1. Diagnose the issue by using a scan tool to read the code and inspect the fuel level sensor and its wiring.
  2. Replace the faulty fuel level sensor if necessary.
  3. Repair any damaged wiring in the sensor circuit.
  4. Check and reprogram the ECM if a software glitch is suspected.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1100 2015 GMC Sierra

The typical repair costs for addressing a P1100 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty fuel level sensor can range from $100 to $300, including parts and labor. However, if the problem is related to wiring issues or a malfunctioning ECM, the costs may be higher.

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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 P1100 2015 GMC Sierra Code

1. What does the P1100 code mean on a 2015 GMC Sierra?

The P1100 code indicates that the Fuel Level Sensor 2 signal message counter is incorrect, meaning there is an issue with the communication or data from the secondary fuel level sensor.

2. What are common symptoms of a P1100 code?

Symptoms may include erratic or inaccurate fuel gauge readings, a check engine light, or difficulties monitoring the fuel level accurately.

3. What causes the P1100 code to appear?

Common causes include a faulty secondary fuel level sensor, wiring or connector issues, a malfunctioning fuel pump module, or software communication errors.

4. Can a loose connection trigger the P1100 code?

Yes, a loose or corroded connection in the wiring harness or connectors associated with the secondary fuel level sensor can trigger this code.

5. How do I diagnose the P1100 code?

Diagnosis involves checking the wiring and connectors for damage or corrosion, testing the secondary fuel level sensor, and verifying the fuel pump module operation with a scan tool.

6. Can I drive with the P1100 code on my 2015 GMC Sierra?

While the vehicle may still be drivable, an inaccurate fuel gauge can lead to running out of fuel unexpectedly, which can be dangerous.

7. How do you fix the P1100 code?

Repairs may include replacing the secondary fuel level sensor, repairing damaged wiring or connectors, or updating the vehicle's software if a communication issue is identified.

8. Is the P1100 code related to the fuel pump?

Yes, since the secondary fuel level sensor is often integrated into the fuel pump module, issues with the fuel pump module can sometimes cause this code.

9. How much does it cost to fix a P1100 code?

The cost depends on the exact issue, but replacing the fuel level sensor or repairing wiring typically ranges from $150 to $500, including parts and labor.

10. Can a faulty PCM cause the P1100 code?

While rare, a malfunctioning Powertrain Control Module (PCM) could potentially cause communication issues that trigger the P1100 code.

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