P0108 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 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 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?
- 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?
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 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 Makes
- P0108 Acura — Manifold Absolute Pressure Sensor Circuit High Voltage
- P0108 Audi — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 BMW — Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
- P0108 Buick — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Cadillac — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Chevrolet — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Chrysler — Manifold Absolute Pressure Sensor Circuit High
- P0108 Dodge — Manifold Absolute Pressure Sensor Circuit High
- P0108 Ford — Manifold Absolute Pressure/Barometric Pressure Sensor High Input
- P0108 GMC — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Honda — Manifold Absolute Pressure Sensor Circuit High Voltage
- P0108 Hyundai — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Isuzu — Manifold Absolute Pressure Sensor High Voltage
- P0108 Jaguar — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Jeep — Manifold Absolute Pressure Sensor Circuit High
- P0108 KIA — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Lincoln — Manifold Absolute Pressure/Barometric Pressure Sensor High Input
- P0108 Mazda — Manifold Absolute Pressure Sensor Circuit High Input
- P0108 Mercedes-Benz — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Mercury — Manifold Absolute Pressure/Barometric Pressure Sensor High Input
- P0108 MINI — Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
- P0108 Mitsubishi — Manifold Absolute Pressure Circuit High Input
- P0108 Pontiac — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 RAM — Manifold Absolute Pressure Sensor Circuit High
- P0108 Saturn — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Subaru — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- P0108 Volkswagen — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Frequently Asked Questions about P0108 Code
1. What does OBDII code P0108 mean?
Code P0108 indicates that the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (Baro) sensor in your vehicle is sending a higher voltage signal than expected to the engine control module (ECM), suggesting an issue with the sensor or its circuit.
2. What are the common symptoms of code P0108?
Symptoms may include a rough idle, engine stalling, engine misfires, decreased fuel economy, and the engine may run either too lean or too rich. The Check Engine Light will also illuminate.
3. What could cause the OBDII code P0108 to appear?
Possible causes include a faulty MAP sensor, wiring issues (such as shorts or open circuits), or problems with the ECM itself. Other potential causes are vacuum leaks or a faulty electrical connector at the MAP sensor.
4. How can I troubleshoot and fix the P0108 code?
Start by visually inspecting the MAP sensor and its connections for any signs of damage or disconnections. Check the sensor’s voltage output with a multimeter. If the voltage is too high compared to specifications, replacing the MAP sensor might resolve the issue. Also, ensure there are no vacuum leaks and that the wiring and connectors are intact and secure.
5. Can I drive my car with the P0108 code showing?
While you may be able to drive with the P0108 code, it is not recommended. The engine may run inefficiently, leading to increased fuel consumption and potential damage to the engine over time. It's best to address the issue as soon as possible.
6. What tools do I need to diagnose the P0108 code?
You will need a digital multimeter to measure the voltage output of the MAP sensor and an OBDII scanner to read the code and monitor live data. A vacuum gauge might also be useful for checking for any vacuum leaks around the sensor and intake manifold.
7. How does the MAP sensor affect engine performance?
The MAP sensor provides essential data regarding the air pressure in the intake manifold, which helps the ECM calculate the optimal air-fuel mixture and manage the ignition timing. A malfunctioning MAP sensor can disrupt these calculations, leading to poor engine performance.
8. What is the difference between the MAP sensor and the barometric pressure sensor?
Both sensors measure pressure, but the MAP sensor specifically measures the pressure inside the intake manifold relative to the outside air pressure, which varies with engine load. The barometric pressure sensor, on the other hand, measures the atmospheric pressure and is used to adjust the base fuel calculations under varying weather conditions.
9. Could a dirty air filter cause the P0108 code?
While a dirty air filter itself doesn’t directly cause a P0108 code, it can lead to an incorrect reading if it severely restricts air flow to the engine, potentially affecting the vacuum levels and the MAP sensor's readings indirectly. It's good practice to check and replace the air filter if necessary during diagnosis.
1. What does the OBDII code P0108 indicate?
The code P0108 indicates that the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure Sensor (BARO) in your vehicle is sending a higher voltage signal than expected to the Engine Control Module (ECM), suggesting an issue with the sensor or its circuit.
2. What are common symptoms of code P0108?
Common symptoms include rough idling, engine stalling, difficulty starting the engine, and decreased fuel economy. The engine may also run rich, and the check engine light will be illuminated.
3. What could cause the P0108 code to appear?
Potential causes include a faulty MAP sensor, wiring issues like shorts or disconnections in the MAP sensor circuit, or a problem with the ECM itself.
4. How can I fix the P0108 code?
Repairs can involve replacing the MAP sensor, repairing or replacing damaged wires or connectors in the MAP sensor circuit, or in rare cases, replacing or reprogramming the ECM.
5. Is it safe to drive with the P0108 code?
While you might be able to drive with this code active, it is not recommended as the engine might perform unpredictably, potentially leading to stalling or difficulty in handling the vehicle safely.
6. How is the P0108 code diagnosed?
Diagnosis typically involves using an OBDII scanner to confirm the code, visually inspecting the MAP sensor and associated wiring, and testing the sensor’s output with a multimeter. A professional mechanic may also check the ECM’s software and connections.
7. Can a bad MAP sensor affect vehicle performance?
Yes, a malfunctioning MAP sensor can significantly affect engine performance since it provides crucial data for air-fuel mixture calculations, affecting the efficiency and stability of engine operation.
8. What tools are needed to diagnose the P0108 code?
Tools needed may include an OBDII scan tool, a digital multimeter, and basic hand tools for accessing and testing the sensor and wiring.
9. How often do MAP sensors fail, leading to the P0108 code?
MAP sensors can fail due to normal wear and tear, especially in older vehicles. Their lifespan can also be shortened by engine contaminants and exposure to extreme temperatures or vibrations.
Discuss the causes and fixes for P0108 OBDII Code
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i have 2006 suzuki grand vitara code p2227 , p0108 , p2229 , p1108. cleared codes and just start engine and comes right back. idles great drives smooth but feels like its working hard (A LOT OF THROTTLE FOR REACTION )
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