P0108 - MAP Pressure Circuit High Input

Trouble Code - P0108 - OBD-II Technical Description

Manifold Absolute / Barometric Pressure Loop High Input

The manifold absolute pressure sensor, also known as the MAP sensor, is capable of measuring the negative air pressure in the engine manifold. Typically, this sensor has three wires: a 5 volt reference wire that connects directly to the PCM, a signal wire that informs the PCM of the MAP sensor voltage reading, and a wire to ground.

If the MAP sensor shows inconsistencies in the results it returns to the car ECU, most likely a P0108 OBDII DTC will be found.

What does code P0108 mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles. Although general, specific repair steps may differ depending on the brand / model.

The MAP (Manifold Absolute Pressure) sensor measures the negative air pressure in the engine manifold. This is usually a three wire sensor: a ground wire, a 5V reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading when it changes.

The higher the vacuum in the motor, the lower the voltage value. The voltage should be in the range of about 1 volt (idle) to about 5 volts (WOT).

If the PCM sees that the voltage reading from the MAP sensor is greater than 5 volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, P0108 A malfunction code will be set.

Symptoms of code P0108

Symptoms of a P0108 trouble code may include:

• The MIL (Malfunction Indicator Lamp) will likely illuminate
• The engine may not work well
• The engine may not run at all
• Fuel consumption can be reduced
• Exhaust black smoke
• The engine is not working properly.
• The engine doesn't run at all.
• Significant reduction in fuel consumption.
• The constant presence of black smoke in the exhaust.
• Engine hesitation.

Causes

Possible reasons for the P0108 code:

• Bad MAP sensor
• Leakage in vacuum line to MAP sensor
• Vacuum leak in the engine
• Shorting the signal wire to the PCM
• Short circuit on voltage reference wire from PCM
• Open in the ground circuit on the MAP
• A worn out engine causes a low vacuum

Possible solutions

A good way to diagnose if the MAP sensor is at fault is to compare the MAP KOEO (key on engine off) reading on the scan tool to the barometric pressure reading. They must be the same because they both measure atmospheric pressure.

If the MAP reading is greater than 0.5 V of the BARO reading, then replacing the MAP sensor will most likely fix the problem. Otherwise, start the engine and observe the MAP reading at idle speed. Typically it should be around 1.5V (depending on height).

but. If so, the problem is most likely temporary. Check all vacuum hoses for damage and replace if necessary. You can also try wiggle test the harness and connector to reproduce the problem. b. If the scan tool MAP reading is greater than 4.5 volts, check the actual engine vacuum with the engine running. If it is less than 15 or 16 inches Hg. code. Correct engine vacuum problem and recheck. c. But if the actual vacuum value in the engine is 16 inches Hg. Art. Or more, turn off the MAP sensor. The scan tool MAP reading should indicate no voltage. Ensure that the ground from the PCM is not damaged and that the MAP sensor connector and terminals are tight. If communication is OK, replace the card sensor. d. However, if the scan tool displays a voltage value with KOEO and the MAP sensor disabled, it could indicate a short in the harness to the MAP sensor. Switch off the ignition. On the PCM, disconnect the connector and remove the MAP signal wire from the connector. Reconnect the PCM connector and see if the MAP scan tool displays voltage at KOEO. If this still happens, replace the PCM. If not, check the voltage on the signal wire you just disconnected from the PCM. If there is voltage on the signal wire, locate and repair the short in the harness.

Other MAP sensor codes: P0105 - P0106 ​​- P0107 - P0109

How to Fix P0108 Engine Code in 2 Minutes [1 DIY Method / Only $11.6]

Code P0108 Nissan

P0108 OBD2 Error Code Description for Nissan

High pressure input in the barometric/absolute manifold. This malfunction is located precisely in the MAP sensor, the abbreviation of which, translated from Spanish, means "Absolute pressure in the manifold."

This sensor is usually 3-wire:

• Ground wire.
• Reference wire 5 volts
• Signal cable.

The moment the PCM notices that the MAP sensor voltage reading is greater than 5 volts or simply not within the default settings, the Nissan code P0108 is set.

What does a P0108 Nissan DTC mean?

This fault basically indicates that the MAP sensor reading is completely out of range due to voltage being too high. This will affect the entire fuel system, where, if not taken urgently, it can cause severe engine damage.

The most common symptoms of the P0108 Nissan error

• The control lamp of the engine always burns on a combination of devices of the car.
• High fuel consumption due to poor combustion.
• Black smoke from the exhaust pipe.
• Has instability during startup and handling.

Solutions for DTC Code P0108 OBDII Nissan

• Having a Nissan model manual handy will help you with questions and details that you can only get then.
• For a quick diagnosis and to eliminate the guesswork, you can compare the MAP sensor readings to barometric pressure. If the MAP sensor reads more than 0,5 volts higher, the MAP sensor needs to be replaced.
• Another way to find out the cause of the problem is to unplug the sensor and see if it is still getting voltage readings. In this case, the fault is in the sensor wiring system, where a short circuit can occur. Start repairing and replacing cables.

Common Causes of a P0108 Nissan DTC

• Engine vacuum leak.
• The third MAP sensor leading to the PCM is sometimes shorted.
• Damaged MAP sensor.
• Leak in the vacuum supply line to the absolute pressure sensor.
• MAP sensor ground wire may be shorted.

Code P0108 Toyota

Description of code P0108 OBD2 Toyota

This defect only applies to turbocharged and naturally aspirated engines, although symptoms and damage tend to be greater with a turbocharged engine.

The MAP sensor always measures negative air pressure in the engine. The higher the internal vacuum of the motor, the lower the voltage reading should be. The error occurs when the PCM has detected a malfunction in the sensor.

What does Toyota DTC P0108 mean?

Is this DTC really dangerous? A malfunctioning MAP sensor requires immediate attention. This code can cause progressively milder symptoms that directly affect engine performance.

The most common symptoms of the P0108 Toyota error

• On Toyota models, the P0108 code is preceded by a Check Engine trip on the vehicle's instrument cluster.
• The car will not run at idle.
• Poor fuel consumption.
• You will notice that fuel consumption will increase dramatically.
• Uneven acceleration.

Solutions for DTC Code P0108 OBDII Toyota

• To check the codes, you can scan then reset the codes and take another walk test in combination with a real-time scanner.
• If code P0108 is stored, check the MAP sensor voltage which is 5 volts internally, 0,5 volts at idle and 5 volts maximum at the ECU.
• Disconnect and install the electrical connector to ensure the new connection to the sensor is in the correct range. If the problem is in the sensor, then it must be replaced.
• Make sure the wiring is good or has a bad connection.

Common Causes of a P0108 Toyota DTC

• The most common cause is a bad MAP sensor.
• The input voltage from the MAP sensor to the ECU is greater than 5 volts.
• Wiring may be faulty or poorly connected.
• Bad ground connection.
• Vacuum leak.

Code P0108 Chevrolet

Description of code P0108 OBD2 Chevrolet

The engine control module (ECM) always uses the MAP sensor to measure and control fuel delivery for optimum combustion.

This sensor is responsible for measuring pressure changes, thus adapting the output voltage to the pressure in the engine. Within a few seconds of an unexpected change in MAP sensor voltage, DTC P0108 will set.

What does DTC P0108 Chevrolet mean?

We must know that this DTC is a generic code, so it can appear in any vehicle, whether it is a Chevrolet vehicle or another make or model.

The P0108 code indicates a MAP sensor failure, a malfunction that must be resolved quickly in order to enable several mandatory components.

The most common symptoms of error P0108 Chevrolet

• Illumination service engine light or also known as engine light.
• Strong buildup of the engine at start-up and when driving on the highway.
• The engine runs ok.
• Bad gasoline and black smoke from the exhaust pipe, a product of raw gasoline passing through the injectors.

Solutions for DTC Code P0108 OBDII Chevrolet

Since this is a generic code, you can try the solutions provided by brands like Toyota or Nissan mentioned earlier.

Common Causes of a P0108 Chevrolet DTC

• Damaged MAP sensor.
• Short circuit, incorrect connection or deterioration of one of the 3 wires of the MAP sensor.
• Engine with a vacuum leak.
• An old engine maintaining a low vacuum.
• Leak between vacuum line and MAP sensor.

Code P0108 Ford

Ford P0108 OBD2 code description

The description of the Ford P0108 code is the same as the brands mentioned above such as Toyota or Chevrolet as it is a generic code.

What does the P0108 Ford trouble code mean?

Code P0108 indicates that this is a general transmission fault applicable to all vehicles with an OBD2 system. However, some concepts regarding repair and symptoms may logically vary from brand to brand.

The job of the MAP sensor is nothing more than to measure the vacuum in the engine manifold and work based on those measurements. The higher the vacuum in the motor, the lower the input voltage must be, and vice versa. If the PCM detects a higher voltage than previously set, DTC P0108 will set permanently.

The most common symptoms of the P0108 Ford error

• MIL or Check Engine light on the instrument cluster of your Ford.
• Engine failure is inevitable. Or maybe it suddenly stops working.
• Poor fuel consumption.
• Sometimes this code is very difficult to get started.
• The presence of black smoke and high fuel consumption.

Solutions for DTC Code P0108 OBDII Ford

• Check the actual vacuum reading with the engine running. If less than 15 inches. Hmm, this is due to bad engine vacuum caused by a worn engine. Then fix the vacuum problem and try again.
• If engine vacuum is not the problem, disconnect the MAP sensor from the scan tool and verify that the automotive scanner shows no voltage reading. If it still detects voltage, there is a short in the MAP sensor harness that you need to find and repair.
• For more possible solutions, you can refer to the solutions mentioned by Toyota and Nissan mentioned earlier.

Common Causes of a P0108 Ford DTC

The reasons for this code in Ford are very similar to the reasons for brands such as Toyota or Nissan.

Code P0108 Chrysler

Code Description P0108 OBD2 Chrysler

This annoying code is the product of a constant voltage input, well in excess of the correct range, to the Engine Control Unit (ECU) from the MAP sensor.

This MAP sensor will change resistance based on altitude and atmospheric connections. Each of the engine's sensors, such as the IAT and in some cases the MAF, will work in conjunction with the PCM to provide accurate data readings and adapt to the needs of the engine.

What does a P0108 Chrysler DTC mean?

The DTC will be detected and set as soon as the input voltage from the MAP sensor to the engine control module exceeds 5 volts for half a second or more.

The most common symptoms of a P0108 Chrysler error

You will find obvious engine problems in your Chrysler vehicle. From hesitation to gross idleness. In some more difficult cases, the engine will not start. Also, the check engine light, also known as the check engine light, is never missing.

Solutions for DTC Code P0108 OBDII Chrysler

We invite you to try the solutions mentioned in the Ford and Toyota brands, where you will find detailed solutions that you can implement in your Chrysler vehicle.

Common Causes of a P0108 Chrysler DTC

• The MAP sensor itself will be the first and foremost cause of this code, as it may be faulty.
• Poor electrical connection of the MAP sensor circuit.
• One of the 3 absolute pressure (MAP) sensor harnesses is shorted.
• Faulty powertrain control module or PCM.

Code P0108 Mitsubishi

Description of code P0108 OBD2 Mitsubishi

The description of DTC P0108 in Mitsubishi is the same as in brands like Chrysler or Toyota mentioned above.

What does Mitsubishi DTC P0108 mean?

The PCM returns this DTC to avoid more serious and complex problems as it is due to the dangerous operation of the MAP sensor supplying a power surge to the ECU.

The most common symptoms of the Mitsubishi P0108 error

• Code P0108 will cause excessive fuel consumption.
• There is nasty black smoke coming out of the exhaust pipe.
• Malfunction at idle.
• Sudden and uneven acceleration.
• Expensive startups and sudden shutdowns.

Solutions for DTC Code P0108 OBDII Mitsubishi

• Compare sensor readings with barometric pressure readings relative to barometric pressure. If the results differ by more than 0,5 volts, the problem is with the sensor itself and must be replaced.
• If not, rule out the MAP sensor and move to the engine where you will check the actual vacuum reading. The average engine has a pressure of at least 15 inches of mercury. If below, fix the problem.
• Check each wire and circuit of the MAP sensor, if necessary, replace or connect correctly.

Common Causes of a P0108 Mitsubishi DTC

The reasons for the appearance of the P0108 fault code in Mitsubishi cars compared to other brands are no different. You can find detailed information about brands like Chrysler or Nissan mentioned above.

Code P0108 Volkswagen

Code Description P0108 OBD2 VW

The ECM continuously sends voltage references to the MAP sensor as atmospheric pressure is also combined with the output voltage. If the pressure is low, a low voltage of 1 or 1,5 will go with it, and a high pressure will go with an output voltage of up to 4,8.

DTC P0108 is set when the PCM detects an input voltage above 5 volts for more than 0,5 seconds.

What does the P0108 VW DTC mean?

This generic code can apply to all turbocharged and naturally aspirated engines that have an OBD2 connection. So you can compare its meaning with that of brands like Nissan and Toyota and thus have a wide range of concepts related to the subject.

The most common symptoms of the P0108 VW error

• The first and most persistent symptom is the automatic activation of the Check Engine indicator.
• Engine stalled and stalled.
• Sometimes the engine won't even start.
• Black exhaust smoke.
• Abnormal consumption of fuel, gas or gasoline.

Solutions for DTC Code P0108 OBDII VW

As part of a large group of universal codes, you can try all the solutions presented in previously introduced brands such as Mitsubishi or Ford.

Common Causes of a P0108 VW DTC

• Faulty MAP sensor.
• Damaged PCM.
• A vacuum leak from the MAP sensor is a common cause of code P0108.
• Wiring problems caused by poor connections or shorts in your Volkswagen's wiring.
• Engine with low vacuum due to wear.

Code P0108 Hyundai

Code Description P0108 OBD2 Hyundai

The error code in Hyundai cars has the same type of description as the error code in cars of brands such as Volkswagen or Nissan, which we have already described.

What does the P0108 Hyundai DTC mean?

This code should cause an urgent need to visit a mechanic or have it repaired by us, P0108 refers to a problem in the MAP sensor circuit, a malfunction that can cause sudden and unintentional power outages, as well as great difficulty starting, creating uncertainty when pulling away. house.

The most common symptoms of the P0108 Hyundai error

The symptoms present in any Hyundai vehicle are completely similar to the brands mentioned above. You can turn to brands like VW or Toyota where you can expand on this topic.

Solutions for DTC Code P0108 OBDII Hyundai

Try solutions previously provided by brands such as Toyota or Nissan, or their solutions in the form of a shared code. There you will find a large repertoire of options that are sure to help you.

Common Causes of a P0108 Hyundai DTC

• The reason is always in the damaged sensor.
• The MAP sensor harness may be shorted, misplaced, or poorly connected.
• A bad PCM is also the cause of DTC P0108.
• The MAP sensor circuit may have poor electrical contact.
• Worn motor with low vacuum.

Code P0108 Dodge

Description of error P0108 OBD2 Dodge

Manifold absolute pressure (MAP) sensor - high input. This DTC is a code for vehicles equipped with OBD2 that directly affects the transmission, regardless of the make or model of the vehicle.

The manifold absolute pressure sensor, known by its acronym MAP, is responsible for continuously measuring the air pressure in the engine's manifold. And it has 3 wires, one of which is a signal wire that informs the PCM of every MAP voltage reading. If this wire sends a higher value than the PCM sets, a P0108 Dodge code is detected in less than a second.

What does a P0108 Dodge DTC mean?

Bearing in mind that this is a generic code, its terms and concepts from other brands such as Hyundai or Nissan fit perfectly, with slight differences in each brand's definitions.

The most common symptoms of the P0108 Dodge error

• The MIL or Check Engine light is on, indicating a malfunction.
• Obvious shortcomings in the engine, probably worth parting, or maybe not parting.
• Thick black smoke from the exhaust.
• The fuel consumption will be very abnormal.
• Sometimes the engine stalls while driving.

Solutions for DTC Code P0108 OBDII Dodge

We recommend that you try the solutions for the P0108 general trouble code and if they don't work, you can try the solutions provided by brands like Toyota or Mitsubishi.

Common Causes of a P0108 Dodge DTC

• The causes will be related to the intake manifold absolute pressure sensor, it is possible that this absolute pressure sensor is faulty.
• The MAP sensor electrical connection is too loose.
• Vacuum leak from engine or MAP sensor.
• Manifold absolute pressure sensor wires are incorrectly connected, misplaced, or shorted.
• Low engine pressure.
• The engine control module itself is faulty.

Important! Not all OBD2 codes used by one manufacturer are used by other brands and they may have different meanings.
The information provided here is for informational purposes only. We are not responsible for the actions you take with your vehicle. If you are in doubt about the repair of your car, contact the service center.

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