P0108 The manifold pressure (MAP) sensor is sending a voltage that stays too high for the engine load

MAP / barometric pressure sensor circuit high input

Monitor

The sources describe reduced power, hard starting and rough idle and a GM bulletin ties it to reduced engine power, but none rates the code as dangerous, so you can usually drive while you book a check.

It gets more serious if:

  • Inspect soon: Inspect soon if the engine stalls, hesitates badly or loses power. A GM bulletin ties P0108 on a disconnected MAP sensor to reduced engine power.

Source: how we rate severity

P0108 in short

P0108 means the manifold pressure (MAP) sensor is sending a signal that stays too high for the engine load. A faulty sensor, wiring that shorts to voltage, or a disconnected sensor connector are common causes, and some Chrysler, Dodge and Jeep models have a software update. It is usually drivable, but stalling needs a check.

The MAP sensor tells the computer how much air pressure is in the intake. The computer uses it to work out engine load and fuel. When the signal sits higher than the computer expects for the throttle position, it sets P0108.

The sensor itself, its wiring or its plug are the first places to look. A GM bulletin for the 2006 Topkick and Kodiak traced P0107 and P0108 to a MAP sensor connector that had come off, and several Chrysler bulletins cover the code with a computer update.

Air leaks, a clogged air filter or converter, a faulty throttle position sensor or high charging voltage can also push the reading off, according to TroubleCodes.net.

Most likely causes

  1. MAP sensor

    Common general cause
    Why it ranks here
    TroubleCodes.net lists a defective MAP or barometric sensor first for P0108.
    What would change this
    Rises if the reading does not change with throttle or vacuum and the wiring tests good. Falls if the sensor reads correctly when tested.

  2. Wiring short to voltage or a loose MAP sensor connector

    Supported by vehicle data
    Why it ranks here
    TroubleCodes.net lists wiring shorts to positive voltage and damaged connectors, and a GM bulletin found the MAP sensor connector disconnected on 2006 Topkick and Kodiak trucks.
    What would change this
    Rises if the connector is loose or the harness is damaged. Falls if the connector is tight and the harness tests good.

  3. Engine computer software (some Chrysler, Dodge and Jeep models)

    Supported by vehicle data
    Why it ranks here
    FCA flashes 18-033-12 (2011 Journey), 18-031-12 (2011-2012 Charger, Challenger, 300C) and 18-014-13 (2011 Durango and Grand Cherokee) reprogram the computer when P0108 is set, and say the update corrects it.
    What would change this
    Rises on these vehicles if the computer is not at the latest software. Falls if it is current.
    How to test the engine control module (ecm / pcm)

  4. Vacuum leak, clogged air filter or clogged converter

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net says to begin with the air filter, vacuum hoses and catalytic converter. They rank lower because the sensor and wiring are the more direct causes.
    What would change this
    Rises if a leak or restriction is found. Falls if the intake and exhaust are clear.
    How to test the vacuum hoses and intake leaks

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Check that the MAP sensor connector is fully seated and the harness is undamaged, and read the sensor value with the key on and engine off.

    Low riskTool: scan tool with live data

  2. Ask a dealer whether your VIN has a computer update for P0108. Several 2011-2013 Chrysler, Dodge and Jeep models do.

    Low risk

  3. Test the MAP sensor against the maker specification and inspect the air filter, vacuum hoses and exhaust for restriction or leaks.

    Use cautionTool: multimeter

    Warning:Probe only the sensor circuits as the service manual says. Back-probing the wrong wire can damage the computer.

Symptoms

  • Check engine light
  • Rough idle or hesitation on acceleration
  • Hard starting or worse fuel economy
  • Stalling or reduced engine power Gets more serious: stop and have it checked.

Compare with: Rough idle with the check engine light on

How to fix

  1. With the engine off, check that the MAP sensor connector is fully pushed on and the wires are not damaged.

  2. Ask a dealer whether your VIN has an open computer update for P0108.

Parts and cost context

  • Vacuum hoses and intake leaks:Check hoses and the air filter first; they are cheap. A MAP sensor is a small part, but wiring and connector faults are common. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Dodge

  • 2011 · Journey

    Supported by vehicle data

    FCA flash 18-033-12 reprograms the powertrain computer for P0108. Whether it is still current is not verified.

  • 2011–2012 · Charger

    Supported by vehicle data

    FCA flash 18-031-12 reprograms the computer for P0108 on the Charger and Challenger. Whether it is still current is not verified.

  • 2011 · Durango

    Supported by vehicle data

    FCA flash 18-014-13 reprograms the computer for P0108. Whether it is still current is not verified.

  • 18-033-12Status unverified

    MIL illumination P0108 (MAP sensor circuit high)

    2011journey · NHTSA 10128929

    Selectively erases and reprograms the powertrain computer; says the update corrects P0108.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 18-031-12Status unverified

    MIL illumination P0108

    2011–2012charger, challenger · NHTSA 10128942

    Selectively erases and reprograms the powertrain computer for P0108. The summary also covers the Chrysler 300C.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 18-014-13Status unverified

    MIL illumination P0108

    2011durango · NHTSA 10128996

    Selectively erases and reprograms the powertrain computer for P0108. The summary also covers the 2011 Jeep Grand Cherokee.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0113The intake air temperature signal is stuck at a reading colder than any real air could be

    Same system Possible — needs testing

    P0113 is an intake air temperature sensor high-input fault, another air-metering sensor code that can set with a wiring or computer problem.

  • P0102The airflow sensor's signal is lower than the engine computer will accept

    Same system Possible — needs testing

    P0102 is a low MAF signal, another air-metering code; a clogged air filter or intake leak can affect both sensors.

All Air metering (MAF, MAP and intake air temperature) codes

P0108 questions

Is it safe to drive with P0108?

Usually, if the engine runs normally. Get it checked soon if it stalls, hesitates badly or loses power.

Should I replace the MAP sensor first?

Check the sensor connector and the wiring first. A loose connector caused the code on some GM trucks, and some Chrysler models need a software update instead.

Sources and review

  1. P0108 trouble code summary — TroubleCodes.net
  2. Bulletin 07-06-04-002 Reduced power with P0107 or P0108, MAP sensor disconnected — General Motors
  3. Flash 18-033-12 MIL illumination P0108 — FCA US
  4. Flash 18-031-12 MIL illumination P0108 — FCA US
  5. Flash 18-014-13 MIL illumination P0108 — FCA US
Last reviewed
Written by
Saurabh K.
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