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P0108 2018 Chevrolet Silverado Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Quick Answer

The P0108 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit having a high input signal. Common causes include Faulty MAP sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leak in the intake manifold. 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 MAP sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leak in the intake manifold.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0108 2018 Chevrolet Silverado Description

The P0108 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit having a high input signal. The MAP sensor measures the pressure inside the intake manifold, providing crucial data to the engine control module (ECM) for calculating air/fuel mixture and ignition timing. The BARO sensor, on the other hand, measures the atmospheric pressure outside the vehicle, which is used by the ECM for altitude compensation.

OBDII Code P0108 2018 Chevrolet Silverado - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0108 2018 Chevrolet Silverado Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Common Causes of P0108 2018 Chevrolet Silverado

  1. Faulty MAP sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Vacuum leak in the intake manifold
  4. Malfunctioning ECM
  5. Incorrect sensor readings due to environmental factors (e.g., extreme temperatures)

Symptoms of P0108 2018 Chevrolet Silverado

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Hesitation or lack of power during acceleration
  4. Illumination of the check engine light
  5. Engine knocking or pinging under load

How to Fix P0108 2018 Chevrolet Silverado

  1. Begin by using a scan tool to verify the P0108 code and check for any other related codes.
  2. Inspect the MAP sensor and BARO sensor wiring and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  3. Check for vacuum leaks in the intake manifold by using a smoke machine or a can of carburetor cleaner. Repair any leaks found.
  4. Test the MAP sensor and BARO sensor using a multimeter to ensure they are functioning within specifications. Replace any faulty sensors.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0108 2018 Chevrolet Silverado

The typical repair costs for addressing a P0108 code on a 2018 Chevrolet Silverado can range from $100 to $300, depending on the specific cause of the issue and the cost of replacement parts. This estimate includes the cost of a new MAP sensor, labor for diagnosis and repair, and any additional parts or materials needed. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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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