Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Diagnostic Trouble Code (DTC): P1108 - Barometric Pressure (BARO) Sensor - Circuit/Voltage High

Diagnostic Trouble Code (DTC): P1108 - Barometric Pressure (BARO) Sensor - Circuit/Voltage High

Check Engine Light

P1108 code definition

The P1108 code is a manufacturer-specific powertrain code related to fuel and air metering. In this case it means that the engine control module (ECM) has detected a fault with the barometric pressure (BARO) sensor signalling a higher than normal voltage signal. It may also be due to a fault with the Manifold Absolute Pressure (MAP) sensor.

As the P1108 code is manufacturer specific, the following manufacturers may have specifics regarding their specific makes including, but not limited to Acura, General Motors, Honda, Isuzu, Jaguar, and Saab.

Codes related to the P1108 include:

What the P1108 code means

A code P1108 will be stored when the Manifold Absolute Pressure (MAP) or BARO sensor sends the ECM a higher than normal voltage signal. The MAP sensor is used to read the incoming air charge to an engine. When the BARO sensor reports a voltage higher than predetermined manufacturer parameters, a code can be stored.

What causes the P1108 code?

Several problems may cause a P1108 code including:

What are the symptoms of the P1108 code?

Symptoms of a P1108 code may include:

  • Check engine or warning light may illuminate
  • Vehicle may hesitate during acceleration
  • Vehicle may idle roughly or “stumble” during acceleration
  • Decrease in fuel economy

How does a mechanic diagnose the P1108 code?

A mechanic may use several methods to diagnose a P1108 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P1108 trouble code
  • Visually check for damaged, corroded, open, or shorted electrical wiring and related connectors
  • Diagnose any engine misfire codes, manifold air pressure (MAP) codes, or mass airflow codes
  • Check to see if the issue is in the mass airflow system circuitry
  • Determine if there is a problem with unmetered air entering the engine
  • Check if there is insufficient air supply to the engine
  • Check if the fuel conditions are correct (not too rich or too lean)
  • Determine if there is a clogged filter element
  • Check for a damaged or defective air inlet pipe
  • Check for a clogged catalytic converter
  • Check for any possible vacuum leaks
  • Check for power and ground signals to the MAP or BARO sensors
  • Test sensors against manufacturer's recommendations
  • Test all circuits for continuity and resistance
  • Inspect hot wire of the mass air flow for signs of damage

Common mistakes when diagnosing the P1108 code

At times, it is possible to believe the MAP or BARO sensors are the culprit of a P1108 code, however before replacing these more expensive components, it is recommended to seek the assistance of a professional to fully diagnose wiring and electrical circuitry for possible damage and repair prior to sensor replacement.

How serious is the P1108 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P1108 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P1108 code?

Several repairs can fix a P1108 trouble code and include:

  • Repair any damaged, corroded, open, or shorted electrical wiring and related connectors
  • Fully repair any engine misfire codes, manifold air pressure (MAP) codes, or mass airflow codes
  • Repair any MAF system circuitry issues
  • Repair unmetered air coming into the engine or an insufficient air supply
  • Repair or replace clogged air filter
  • Repair or replace damaged or defective air inlet pipe
  • Clear any clogged catalytic converter(s)
  • Repair any vacuum leaks or replace damaged or defective hoses
  • Replace damaged or defective MAP sensor
  • Replace damaged or defective BARO sensor
  • Repair or replace damaged or defective circuitry
  • Clean debris from mass air flow hot wire
  • Replace damaged or defective ECM
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Need help with a P1108 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: P1743

This code is for a transmission overdrive solenoid problem. The overdrive solenoid would need to be tested to see if it has the proper resistance of 10 to 20 ohms. If it is okay then the harness will need to...

Q: Check Engine Light was on with a gas smell. I took it to the dealer.

I would ask what codes they found and how they determined the fuel pump was the cause. They likely diagnosed the pump by measuring fuel pressure. You didn't say what kind of Hyundai you have, but generally, fuel pressure should...

Q: KOEO test code 332

Hello there, A few different things can cause insufficient EGR flow. The most likely are: a stuck closed EGR valve a failed EGR valve solenoid faulty oxygen sensor low fuel pressure exhaust leak These can also...