P1108 GMC Code - BARO to MAP Sensor Comparison Too High
Quick Answer
When the diagnostic trouble code P1108 appears on a GMC vehicle, it indicates that there is a discrepancy between the Barometric Pressure (BARO) sensor and the Manifold Absolute Pressure (MAP) sensor readings. Common causes include Faulty BARO sensor, Malfunctioning MAP sensor, Wiring or connector issues in the sensor circuit. 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
- P1108 GMC indicates BARO to MAP Sensor Comparison Too High.
- Common causes
- Common causes include Faulty BARO sensor, Malfunctioning MAP sensor, Wiring or connector issues in the sensor circuit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1108 GMC Description
When the diagnostic trouble code P1108 appears on a GMC vehicle, it indicates that there is a discrepancy between the Barometric Pressure (BARO) sensor and the Manifold Absolute Pressure (MAP) sensor readings. The BARO sensor measures the atmospheric pressure outside the engine, while the MAP sensor measures the pressure within the intake manifold. The Engine Control Module (ECM) uses data from both sensors to calculate the air density and adjust the fuel delivery accordingly.
Common Causes of P1108 GMC
- Faulty BARO sensor.
- Malfunctioning MAP sensor.
- Wiring or connector issues in the sensor circuit.
- Vacuum leaks in the intake system.
- ECM software issues.
Symptoms of P1108 GMC
- Check Engine Light is illuminated on the dashboard.
- Rough idle or stalling when the vehicle is at a stop.
- Decreased fuel efficiency.
- Hesitation or lack of power during acceleration.
- Engine may run rich or lean.
How to Fix P1108 GMC
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the trouble codes and freeze frame data.
- Inspect the BARO and MAP sensors, as well as the wiring and connectors for any visible damage or corrosion.
- Test the sensors using a multimeter to ensure they are functioning within specifications.
- Check for any vacuum leaks in the intake system and repair or replace any damaged components.
- Clear the trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1108 GMC
The typical repair costs for addressing the P1108 GMC trouble code can range from $200 to $500, depending on the specific cause of the issue and the necessary repairs. This estimate includes the cost of parts and labor. However, it is important to note that the actual costs may vary based on the location, vehicle make and model, and the rates charged by auto repair shops. It is advisable to consult with a professional mechanic to obtain a more accurate estimate for your specific situation.
When is the Code Detected?
Need more information about the P1108 GMC code?
Need more information on how to fix the P1108 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1108 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1108 GMC Code
No Frequently Asked Questions about P1108 GMC Code found.
Discuss the causes and fixes for P1108 GMC OBDII Code
Code P1108 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.