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P1200 2014 GMC Sierra Code - Fuel Level Sensor 1 Signal Message Counter Incorrect

Quick Answer

The P1200 diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Fuel Level Sensor 1 Signal Message Counter being incorrect. Common causes include Faulty fuel level sensor, Wiring issues or electrical connection problems, Corrosion or damage to the sensor. 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
P1200 2014 GMC Sierra indicates Fuel Level Sensor 1 Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel level sensor, Wiring issues or electrical connection problems, Corrosion or damage to the sensor.
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 15, 2024
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Code P1200 2014 GMC Sierra Description

The P1200 diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Fuel Level Sensor 1 Signal Message Counter being incorrect. The fuel level sensor is responsible for measuring the amount of fuel in the tank and sending this information to the vehicle's computer system. The signal message counter being incorrect suggests that there is a discrepancy in the data being transmitted by the sensor, which can lead to inaccurate fuel level readings on the dashboard. This can result in issues such as incorrect fuel level readings, fuel gauge fluctuations, and potentially even stalling if the vehicle runs out of fuel unexpectedly.

OBDII Code P1200 2014 GMC Sierra - Fuel Level Sensor 1 Signal Message Counter Incorrect
P1200 2014 GMC Sierra Code - Fuel Level Sensor 1 Signal Message Counter Incorrect

Common Causes of P1200 2014 GMC Sierra

  1. Faulty fuel level sensor
  2. Wiring issues or electrical connection problems
  3. Corrosion or damage to the sensor
  4. Issues with the vehicle's computer system
  5. Fuel contamination affecting sensor readings

Symptoms of P1200 2014 GMC Sierra

  1. Inaccurate fuel level readings on the dashboard
  2. Fluctuating fuel gauge
  3. Engine stalling due to running out of fuel unexpectedly
  4. Poor fuel efficiency
  5. Check Engine Light illuminated

How to Fix P1200 2014 GMC Sierra

  1. Diagnose the issue by using a scan tool to read the trouble code and inspect the fuel level sensor and related components.
  2. Replace the faulty fuel level sensor if it is determined to be the cause of the incorrect signal message counter.
  3. Check and repair any wiring issues or electrical connections related to the sensor.
  4. Clear the trouble code from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying issues with the vehicle's computer system.

Cost to Fix P1200 2014 GMC Sierra

The typical repair costs for addressing a P1200 code related to the Fuel Level Sensor 1 Signal Message Counter can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty fuel level sensor can range from $100 to $300, including parts and labor. Additional costs may apply if wiring repairs or computer system diagnostics are required. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

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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 P1200 2014 GMC Sierra Code

1. What does the OBDII code P1200 mean on a 2014 GMC Sierra?

The P1200 code indicates that the Fuel Level Sensor 1 Signal Message Counter is incorrect, meaning the fuel level data being sent to the vehicle's computer is invalid or inconsistent.

2. What are common symptoms of the P1200 code in a 2014 GMC Sierra?

Symptoms may include inaccurate or fluctuating fuel level readings, a check engine light, or issues with the fuel gauge not working correctly.

3. What causes the P1200 code in a 2014 GMC Sierra?

Common causes include a faulty fuel level sensor, wiring issues, a poor electrical connection, or a malfunction in the fuel pump module or instrument cluster.

4. Can a bad fuel pump cause the P1200 code to appear?

Yes, a faulty fuel pump module that includes the fuel level sending unit can cause inaccurate signal messages, triggering the P1200 code.

5. How is the P1200 code diagnosed on a 2014 GMC Sierra?

A mechanic will use a scan tool to verify the code, inspect the fuel level sensor wiring and connections, and test the sensor's output signal for inconsistencies.

6. Can I drive with a P1200 code on my 2014 GMC Sierra?

While it may still be drivable, a P1200 code can result in inaccurate fuel level readings, which could lead to running out of fuel unexpectedly.

7. How do you fix the P1200 code on a 2014 GMC Sierra?

Repairs may involve replacing the fuel level sensor, repairing damaged wiring, or reprogramming the vehicle's computer if necessary.

8. Is replacing the fuel level sensor the only solution for the P1200 code?

No, the issue could also stem from wiring problems, electrical connections, or a malfunctioning fuel pump module, so proper diagnosis is essential.

9. How much does it cost to fix the P1200 code on a 2014 GMC Sierra?

The cost varies depending on the root cause, but replacing the fuel level sensor can range from $200 to $600, including parts and labor.

10. Will clearing the P1200 code with a scan tool fix the issue permanently?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

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