Diagnostic Trouble Code (DTC): P1109 - BARO Sensor Circuit Out of Range High

Our certified mechanics come to you · Get a fair and transparent estimate upfront


Cost of diagnosing the Diagnostic code

Diagnostic is a diagnostic trouble code (DTC) for "Trouble Code (DTC) P1109 - BARO Sensor Circuit Out of Range High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE Diagnostic DIAGNOSTIC Get a fair and transparent estimate upfront

The P1109 code is a manufacturer-specific fault code. It means that the engine control module (ECM) has detected a signal voltage from the barometric (BARO) pressure sensor that is out of the predetermined range.

Because this is a manufacturer-specific code, each automaker may have a slightly different definition, steps for diagnosis, and repair information. Automakers with a P1109 trouble code include, but are not limited to Audi, Citroen/Peugeot, Daewoo, Fiat, Ford, General Motors, Lincoln, Mercury, Mini, Oldsmobile, Volkswagen, and Volvo.

Codes related to the P1109 include:

What the P1109 code means

For most automakers, a code P1109 will be stored when the wrong manifold air pressure (MAP) sensor voltage reading is detected for a preset amount of time, typically four seconds.

A vehicle’s MAP and BARO sensor work to provide the ECM with information related to the amount or degree of air pressure, or vacuum, that is in the intake manifold at a given point in time. The ECM will then use the data to help calculate the best fuel delivery strategy for the most efficient engine operation.

What causes the P1109 code?

Several problems may cause a P1109 code including:

  • Damaged or defective electrical wiring
  • Damaged or defective BARO pressure sensor
  • Damaged or defective MAP sensor
  • Damaged or defective mass airflow (MAF) sensor
  • Damaged or defective throttle position sensor
  • Clogged catalytic converter
  • Incorrect software installed in ECM
  • Damaged or defective ECM

What are the symptoms of the P1109 code?

Symptoms of a P1109 code may include:

  • Check engine or warning light may illuminate
  • Vehicle may idle roughly
  • Engine may hesitate during acceleration
  • Decreased fuel economy

How does a mechanic diagnose the P1109 code?

A mechanic may use several methods to diagnose a P1109 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P1109 trouble code
  • Visually inspect wiring and related electrical components for damage or corrosion
  • Check for problems with the mass airflow (MAF) sensor or trouble codes and diagnose
  • Check for any additional MAP trouble codes and diagnose
  • Check for engine misfire codes and diagnose
  • Check for issue with the mass air flow (MAF) circuit
  • Check for unmetered air entering the engine
  • Check for insufficient air supply to the engine
  • Check for a clogged filter
  • Check for a damaged or defective air inlet pipe
  • Check for clogged catalytic converter(s)
  • Check for any vacuum leaks
  • Check power and ground at MAP and BARO sensors
  • Test sensors using automaker recommendations
  • Check for damaged or dirty hot wire to MAF

Common mistakes when diagnosing the P1109 code

It is possible to misdiagnose the cause of a P1109 code to be either the MAP or BARO sensor, when the true problem is related to electrical wiring and circuitry.

How serious is the P1109 code?

Because a vehicle’s safe driving operation most likely will not be impacted due to faults that store a P1109 code, this code is not considered a potentially serious code. When this code appears, it is recommended to take your vehicle to your local service center or mechanic for repair and diagnosis as soon as you can.

What repairs can fix the P1109 code?

Several repairs can fix a P1109 trouble code and include:

  • Replace damaged or corroded, loose, or shorted electrical wiring and related connectors
  • Repair any mass airflow, manifold air pressure, and engine misfire codes that were also stored
  • Repair any damage or problems with the MAF circuitry
  • Repair or replace clogged or damaged filters
  • Repair damaged or defective air inlet pipe
  • Clear clogged catalytic converter(s)
  • Repair vacuum leaks
  • Replace damaged or defective MAP sensor
  • Replace damaged or defective BARO sensor
  • Clean hot wire to MAF
  • Replace damaged or defective ECM and reprogram
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Need help with a P1109 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.

trouble codes
P1109
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the Diagnostic code.

SCHEDULE Diagnostic DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

Related questions

My car idles roughly and wants to die when I give it gas what could this be?

With this kind of engine issue, I would imagine that your Check Engine Light is on, indicating that the built in diagnostics have logged and error and a diagnostic trouble code. It will be important to know these codes to...

My car shows the Check Engine Light and DPF lights and coil light on the dashboard. What action should I take?

Hi. The EGR valve needs to be replaced and the passages to the EGR need to be cleaned. The EGR location is very tricky to get to so you may need a professional technician (such as one from YourMechanic) who...

VSA and engine lights both come on when I excelerate the car and it runs rough.

Hi there. The VSA (Vehicle Stability Assist) is on for an issue that deals with the engine load. Check the codes that are stored or pending in the ECM (computer) since the check engine light is on. The code should...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com