P0108 2018 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
1. What does the OBDII code P0108 mean on a 2018 Chevrolet Silverado?
P0108 indicates that the Manifold Absolute Pressure (MAP) sensor is reporting a voltage signal that is too high, suggesting an abnormally high pressure reading.
2. What are common symptoms of the P0108 code in a 2018 Chevrolet Silverado?
Symptoms may include rough idling, poor fuel economy, lack of engine power, black exhaust smoke, engine stalling, or the check engine light being illuminated.
3. What causes the P0108 code to appear in a 2018 Chevrolet Silverado?
Common causes include a faulty MAP sensor, issues with the sensor wiring or connectors, a vacuum leak, a clogged or dirty air filter, or a malfunctioning powertrain control module (PCM).
4. Can a dirty air filter trigger the P0108 code in my 2018 Chevrolet Silverado?
Yes, a dirty or clogged air filter can cause inaccurate pressure readings, potentially triggering the P0108 code.
5. How do I diagnose the P0108 code in a 2018 Chevrolet Silverado?
Start by using a scan tool to confirm the code. Then inspect the MAP sensor, wiring, and connectors for damage or corrosion. Check for vacuum leaks and test the sensor using a multimeter to verify voltage output.
6. Can I drive my 2018 Chevrolet Silverado with the P0108 code?
Driving with a P0108 code is not recommended, as it can lead to poor engine performance, increased emissions, and potential damage to other components.
7. How do I fix the P0108 code in a 2018 Chevrolet Silverado?
Repairs may include replacing the MAP sensor, repairing damaged wiring, cleaning or replacing the air filter, fixing vacuum leaks, or reprogramming the PCM if necessary.
8. How much does it cost to fix the P0108 code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the issue, but replacing a MAP sensor typically costs between $100 and $300, including parts and labor.
9. How do I prevent the P0108 code from returning in my 2018 Chevrolet Silverado?
Regular maintenance, such as replacing the air filter, inspecting vacuum lines, and ensuring sensor wiring is intact, can help prevent the P0108 code from recurring.
10. Can a bad MAP sensor cause other issues in my 2018 Chevrolet Silverado?
Yes, a faulty MAP sensor can lead to incorrect air-fuel mixture calculations, resulting in engine misfires, poor acceleration, and increased emissions.
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