P0108 GMC 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 GMC 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 GMC 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 GMC?
- 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 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 P0108 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.
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Information for Specific GMC Models
- P0108 2014 GMC Sierra — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 2015 GMC Sierra — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 2016 GMC Sierra — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 2017 GMC Sierra — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 2018 GMC Sierra — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Frequently Asked Questions about P0108 GMC Code
1. What does the OBDII code P0108 mean on a GMC vehicle?
P0108 indicates that the Manifold Absolute Pressure (MAP) sensor is reporting a voltage signal that is too high, suggesting high pressure in the intake manifold.
2. What are the common symptoms of a P0108 code in a GMC?
Symptoms may include poor fuel economy, rough idling, engine stalling, lack of power, or the Check Engine Light being illuminated.
3. What causes the P0108 code to appear on a GMC?
Common causes include a faulty MAP sensor, a damaged or corroded MAP sensor connector, vacuum leaks, or issues with the vehicle's Engine Control Module (ECM).
4. Can a dirty throttle body trigger a P0108 code on a GMC?
Yes, a dirty or malfunctioning throttle body can affect manifold pressure readings and potentially trigger a P0108 code.
5. How do I diagnose a P0108 code on a GMC?
To diagnose, inspect the MAP sensor and its wiring for damage, check for vacuum leaks, test the sensor with a multimeter, and verify proper operation using a scan tool.
6. Can I drive my GMC with a P0108 code?
Driving with a P0108 code is not recommended as it may cause poor engine performance, increased fuel consumption, and potential damage to other components.
7. How do I fix a P0108 code on my GMC?
Repairs may include replacing the MAP sensor, cleaning the throttle body, repairing damaged wiring or connectors, or addressing any vacuum leaks.
8. Is a P0108 code specific to GMC vehicles?
No, P0108 is a generic OBDII code applicable to all OBDII-equipped vehicles, but the symptoms and fixes may vary slightly depending on the make and model.
9. Can a bad MAP sensor cause engine stalling in a GMC?
Yes, a faulty MAP sensor can send incorrect data to the ECM, leading to improper air-fuel mixture and engine stalling.
10. How much does it cost to repair a P0108 code on a GMC?
The cost depends on the issue, but replacing a MAP sensor typically costs $50-$200, plus labor if done by a mechanic. Additional repairs like fixing wiring or vacuum leaks may increase the cost.
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