P1003 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P1003 GMC?
- 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 GMC?
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 GMC 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.
Need more information about the P1003 GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P1003 2014 GMC Sierra — Fuel Composition Signals Message Counter Incorrect
- P1003 2015 GMC Sierra — Fuel Composition Signals Message Counter Incorrect
- P1003 2016 GMC Sierra — Fuel Composition Signals Message Counter Incorrect
- P1003 2017 GMC Sierra — Fuel Composition Signals Message Counter Incorrect
- P1003 2018 GMC Sierra — Fuel Composition Signals Message Counter Incorrect
Frequently Asked Questions about P1003 GMC Code
1. What are the common symptoms of OBDII code P1003 GMC (Fuel Composition Signals Message Counter Incorrect)?
- Common symptoms include illuminated check engine light, poor engine performance, and potential fuel efficiency issues.
2. What can cause the OBDII code P1003 GMC to be triggered?
- This code can be triggered by issues with the fuel composition sensor, wiring problems, or faulty connections in the fuel system.
3. How can I diagnose the cause of OBDII code P1003 GMC?
- Diagnosis typically involves using a scan tool to read the code, checking the fuel composition sensor and related components for faults, and inspecting the wiring for any damage.
4. Can a bad fuel composition sensor cause code P1003 GMC?
- Yes, a malfunctioning fuel composition sensor can lead to the triggering of this code due to inaccurate readings being sent to the engine control module.
5. What are some repair tips for addressing OBDII code P1003 GMC?
- Repair tips include checking and cleaning the fuel composition sensor, inspecting and repairing any damaged wiring, and resetting the code to see if it returns.
6. Is it safe to continue driving with OBDII code P1003 GMC active?
- It is generally not recommended to continue driving with this code active, as it can negatively impact engine performance and fuel efficiency.
7. Can a DIY enthusiast fix OBDII code P1003 GMC at home?
- Depending on the root cause, some DIY enthusiasts may be able to address this code at home by following repair guides and using basic tools.
8. How much does it cost to repair OBDII code P1003 GMC at a mechanic or dealership?
- Repair costs can vary depending on the specific issue, but they may range from $100 to $500 or more, including parts and labor.
9. Will resetting the OBDII code P1003 GMC make it go away permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.
10. How important is it to address OBDII code P1003 GMC promptly?
- It is important to address this code promptly to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.
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