P1003 2017 GMC Sierra Code - Fuel Composition Signals Message Counter Incorrect
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Fuel Composition Sensor, Fuel Composition Sensor harness is open or shorted, Fuel Composition Sensor 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
- P1003 2017 GMC Sierra indicates Fuel Composition Signals Message Counter Incorrect.
- Common causes
- Common causes include Faulty Fuel Composition Sensor, Fuel Composition Sensor harness is open or shorted, Fuel Composition Sensor 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 P1003 2017 GMC Sierra Description
What are the Possible Causes of the DTC P1003 2017 GMC Sierra?
- Faulty Fuel Composition Sensor
- Fuel Composition Sensor harness is open or shorted
- Fuel Composition Sensor circuit poor electrical connection
How to Fix the DTC P1003 2017 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 P1003 2017 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 P1003 2017 GMC Sierra Code
1. What does the P1003 code mean on a 2017 GMC Sierra?
The P1003 code indicates an issue with the fuel composition signal message counter, meaning the ECM is not receiving accurate or expected data from the fuel composition sensor.
2. What are the symptoms of a P1003 code on a GMC Sierra?
Common symptoms include poor fuel economy, rough idling, reduced engine performance, and potentially an illuminated Check Engine Light.
3. What causes the P1003 code to appear?
The most common causes include a malfunctioning fuel composition sensor, damaged wiring or connectors, or a fault in the ECM.
4. Can a dirty fuel system cause the P1003 code?
No, the code is related to signal issues from the fuel composition sensor and not directly caused by a dirty fuel system.
5. How do you diagnose the P1003 code?
Diagnosis involves checking the fuel composition sensor, inspecting wiring and connectors for damage or corrosion, and using a scan tool to verify the sensor's data stream.
6. Can I drive my GMC Sierra with the P1003 code?
While the truck may still run, driving with this code can lead to poor performance and increased fuel consumption. It's best to address the issue promptly.
7. How is the P1003 code fixed?
Repairs typically involve replacing a faulty fuel composition sensor, repairing damaged wiring, or updating/reprogramming the ECM if necessary.
8. Is the P1003 code specific to flex-fuel vehicles?
Yes, this code is more common in flex-fuel vehicles, as they rely on the fuel composition sensor to adjust for different fuel types.
9. How much does it cost to fix the P1003 code on a GMC Sierra?
Repair costs vary, but replacing a fuel composition sensor typically costs between $150 and $400, including parts and labor.
10. Can a faulty ECM cause the P1003 code?
Yes, in rare cases, a faulty ECM may fail to process signals correctly, leading to this code. However, this is less common than sensor or wiring issues.
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