P0108 2018 GMC Sierra Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Quick Answer
The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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
- P0108 2018 GMC Sierra indicates Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
- Common causes
- Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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 P0108 2018 GMC Sierra Description
The MAP sensor wiring includes 3 circuits. The Engine Control Module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAP Sensor voltage is more than 4.50 V for greater than 13 ms.
What are the Possible Causes of the DTC P0108 2018 GMC Sierra?
- Faulty Manifold Absolute Pressure (MAP) Sensor
- Manifold Absolute Pressure Sensor harness is open or shorted
- Manifold Absolute Pressure Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0108 2018 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 P0108 2018 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 P0108 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P0108 in a 2018 GMC Sierra?
- Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and potential stalling of the vehicle.
2. What can cause the Manifold Absolute Pressure/Barometric Pressure Circuit High Input code in a 2018 GMC Sierra?
- The code P0108 can be triggered by issues such as a faulty MAP sensor, a vacuum leak in the intake system, or problems with the wiring or connectors related to the sensor.
3. How serious is the P0108 code in a 2018 GMC Sierra?
- While the vehicle may still be operable with the P0108 code, it is crucial to address the issue promptly to prevent potential engine damage and ensure optimal performance and fuel efficiency.
4. Can I continue driving my 2018 GMC Sierra with the P0108 code?
- It is generally not recommended to continue driving the vehicle with the P0108 code present, as it can lead to more severe problems and worsen fuel consumption over time.
5. How can I diagnose the cause of the P0108 code in my 2018 GMC Sierra?
- Diagnosing the P0108 code usually involves using an OBDII scanner to retrieve the code, inspecting the MAP sensor and related components, checking for vacuum leaks, and testing the wiring and connectors for any faults.
6. Is it possible to repair the P0108 code in a 2018 GMC Sierra myself?
- Depending on your level of automotive knowledge and experience, you may be able to address the P0108 code yourself by replacing the MAP sensor, fixing any vacuum leaks, or repairing damaged wiring or connectors.
7. How much does it typically cost to repair the P0108 code in a 2018 GMC Sierra?
- The cost of repairing the P0108 code can vary depending on the underlying cause, but it may range from around $100 to $300 for parts and labor if done at a professional auto repair shop.
8. Will resetting the OBDII code P0108 on my 2018 GMC Sierra make it go away permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P0108 code is not addressed, it is likely to reappear after driving a certain distance.
9. Can a dirty air filter cause the P0108 code in a 2018 GMC Sierra?
- While a dirty air filter can affect engine performance, it is not a common cause of the P0108 code. It is recommended to check the MAP sensor, vacuum lines, and related components first.
10. Will driving at high altitudes trigger the P0108 code in my 2018 GMC Sierra?
- Driving at high altitudes can sometimes trigger the P0108 code due to changes in barometric pressure, but if the code persists even at lower altitudes, it is likely caused by a different issue such as a faulty MAP sensor.
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