maruti suzuki P0108

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P0108 Maruti Suzuki – Manifold Absolute Pressure (MAP) / Barometric Pressure Circuit High Input

What Does P0108 Mean?

P0108 – Manifold Absolute Pressure (MAP) / Barometric Pressure Circuit High Input is a generic OBD-II diagnostic trouble code that indicates the Engine Control Module (ECM) has detected an unusually high voltage signal from the MAP sensor or Barometric Pressure Sensor circuit.

The MAP sensor measures the pressure inside the intake manifold and sends this information to the ECM. The ECM uses this data to calculate engine load, fuel injection timing, ignition timing, and air-fuel mixture adjustments.

When the MAP sensor voltage exceeds the manufacturer's specified range, the ECM stores DTC P0108 and illuminates the Check Engine Light.

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What is a MAP Sensor?

The Manifold Absolute Pressure (MAP) Sensor measures the amount of vacuum or pressure inside the intake manifold.

The ECM uses this information to:

• Calculate engine load

• Control fuel injection

• Adjust ignition timing

• Improve fuel economy

• Reduce emissions

• Monitor engine performance

A faulty MAP sensor can cause serious drivability problems.

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Maruti Suzuki Vehicles Commonly Affected

P0108 may occur on various Maruti Suzuki models, including:

• Maruti Suzuki Swift

• Maruti Suzuki Swift Dzire

• Maruti Suzuki Wagon R

• Maruti Suzuki Alto

• Maruti Suzuki Alto K10

• Maruti Suzuki Celerio

• Maruti Suzuki Baleno

• Maruti Suzuki Ertiga

• Maruti Suzuki S-Presso

• Maruti Suzuki Ciaz

• Maruti Suzuki Eeco

• Maruti Suzuki Brezza

• Maruti Suzuki XL6

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Symptoms of P0108

When P0108 is present, drivers may experience:

• Check Engine Light ON

• Rough idle

• Hard starting

• Engine hesitation

• Reduced engine power

• Poor acceleration

• Excessive fuel consumption

• Engine stalling

• Black exhaust smoke

• Poor throttle response

• Engine running rich

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Common Causes of P0108

1. Faulty MAP Sensor

A failed MAP sensor is the most common cause of P0108.

2. Damaged Sensor Wiring

Open circuits, short circuits, or damaged wires can create abnormal voltage readings.

3. Short to Power

A voltage short in the MAP sensor circuit may cause the ECM to receive an excessively high signal.

4. Poor Ground Connection

A weak or missing ground can affect sensor operation.

5. Loose or Corroded Connector

Corroded terminals can cause unstable voltage signals.

6. Vacuum Hose Problems

Disconnected, damaged, or blocked vacuum hoses may affect MAP sensor readings.

7. Faulty ECM

Although uncommon, a defective Engine Control Module can trigger P0108.

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How to Diagnose P0108

Step 1 – Scan for Diagnostic Trouble Codes

Use an OBD-II scanner to confirm P0108 and check for related sensor codes.

Step 2 – Inspect MAP Sensor

Check the sensor for:

• Physical damage

• Oil contamination

• Carbon buildup

• Loose mounting

Step 3 – Inspect Wiring Harness

Check for:

• Open circuits

• Short circuits

• Damaged insulation

• Corrosion

Step 4 – Verify Sensor Voltage

Using a multimeter:

• Check 5V reference supply

• Verify ground circuit

• Monitor MAP sensor signal voltage

Step 5 – Check Vacuum Supply

Inspect vacuum hoses and intake manifold connections.

Step 6 – Monitor Live Data

Using a professional scanner, monitor:

• MAP sensor voltage

• Engine load

• Intake pressure

• Throttle position

• Engine RPM

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How Do I Fix Code P0108?

The repair depends on the cause of the fault. Common fixes include:

Clean or Replace the MAP Sensor

If the sensor is contaminated or faulty, cleaning or replacement may solve the problem.

Repair Damaged Wiring

Repair any:

• Broken wires

• Short circuits

• Corroded terminals

Repair Vacuum Leaks

Replace damaged vacuum hoses and intake connections.

Repair Ground Circuits

Ensure the MAP sensor has a solid ground connection.

Replace Faulty Connectors

Loose or damaged connectors should be repaired or replaced.

ECM Diagnosis

If all other components test correctly, further ECM diagnosis may be required.

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Live Data Testing

A professional scan tool can display MAP sensor values in real time.

Normal readings should:

• Change smoothly with throttle movement

• Respond to engine load changes

• Match engine operating conditions

A constant high voltage signal usually indicates:

• Faulty MAP sensor

• Wiring short to voltage

• ECM input fault

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Estimated Repair Costs

Repair Type	Estimated Cost
Diagnostic Scan	$20 – $100
MAP Sensor Cleaning	$10 – $30
Wiring Repair	$20 – $200
Vacuum Hose Replacement	$10 – $100
MAP Sensor Replacement	$50 – $300
ECM Programming	$100 – $500

Repair costs vary depending on vehicle model and location.

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Can You Drive with P0108?

The vehicle may continue to run with a P0108 code, but performance and fuel economy will usually be affected.

Possible consequences include:

• Poor engine performance

• Increased fuel consumption

• Engine stalling

• Rough idle

• Excessive emissions

• Catalytic converter damage

Prompt diagnosis and repair are recommended.

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Prevention Tips

To reduce the risk of P0108:

• Inspect vacuum hoses regularly

• Keep electrical connectors clean

• Repair wiring damage immediately

• Replace faulty sensors promptly

• Perform regular engine maintenance

• Use quality replacement parts

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Conclusion

P0108 – Manifold Absolute Pressure (MAP) / Barometric Pressure Circuit High Input is a common fault code found on Maruti Suzuki vehicles such as the Swift, Wagon R, Alto, Baleno, Ertiga, and Ciaz. The code indicates that the ECM is receiving an abnormally high voltage signal from the MAP sensor circuit.

Common causes include a faulty MAP sensor, wiring faults, poor grounds, vacuum leaks, or ECM issues. Proper diagnosis using a multimeter and live scan data can quickly identify the root cause and restore normal engine performance.

 P0108 Maruti  manifold absolute pressure/barometric pressure circuit high input

How do I fix code P0108   ,Maruti Suzuki 

Cars, Swift , Alto, Wagon r/  And more Maruti Cars 

 

How do you fix this Eror Fault code,

We will see in this article how to fix this fault code

Whenever you drive the car and you get the check engine light shows inside the culstar meter.

Whenever the error code shows in your car, the first inside the car the check light shows inside the meter. There is a problem in getting pickup in the car and So whenever the cluster shows this light inside the meter, first of all you should scan and if it is showing error code in scanning

.P0108 You should check this sensor wire of the sensor, mostly this sensor wire is cut.And if this wire is ok then you should check voltage in sensor wire and also check socket properly. Is the socket broken or not?Then there could be a problem with the sensor.And if the voltage is not coming inside the wire, then the problem of ECM also comes in this

 Case.Most of the sensors of Maruti vehicles have this location as you can see in the image.And the fault code it is showing is this sensor's location. P0108

 

 Manifold absolute pressure, sensor

 location maruti wagon r

 Maruti  manifold absolute pressure/barometric pressure circuit high input P0108