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P2227 is a diagnostic trouble code (DTC) for "Barometric Pressure Circuit Range/Performance". 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Either the barometric pressure sensor is providing a reading that does not correspond to the parameters of the ECM about the atmospheric conditions, or the output of related sensors such as the throttle position sensor or manifold absolute pressure sensor do not correlate.
The barometric (BARO) sensor is used by the engine control module (ECM) to measure the pressure of the atmosphere. The pressure is affected by weather conditions, air volume, and altitude. A diaphragm is built into the BARO sensor which opens and closes at different atmospheric conditions. The sensor will translate this activity into an electrical resistance.
The ECM will send the BARO sensor a 5 volt reference. The voltage will be met by the resistance created by the BARO sensor. The BARO sensor will ingest the voltage into its own stomach known as resistance. Voltage being sent back to the ECM will vary depending on the amount of resistance inside the BARO sensor. If the voltage sent back to the ECM is too high or too low, a P2227 code will be set.
After the resistance is applied, the remaining voltage will be sent back to the ECM, which will tell the ECM the atmospheric pressure.
An accurate atmospheric pressure reading is needed to by the ECM to maintain delicate tasks such as fuel delivery.
Check Engine Light illumination
Vehicle may go into limp mode. Limp mode is a fail safe mode for the engine where the ECM will only allow the vehicle to reach a limited speed (usually less than 30 miles per hour)
It is best to diagnose such codes with a scan tool and observe the live data. The data from the MAF, BARO and TPS should increase at generally the same rate when opening the throttle
Measuring the voltage coming from the BARO, MAF, and TPS sensor with a multimeter
Inspecting the air box and air intake for debris
Replacing the BARO sensor without the inspection of other sensors such as the MAF and TPS
It is fairly serious because the ECM will not be able to properly regulate the air-fuel ratio of the engine. An improper air-fuel ratio will shorten the lifespan of the engine as well as produce mass toxins which cause harm to the environment.
Replacement of the BARO sensor if found faulty
Repair or replacement of any damaged wiring or connections related to the ECM,BARO,TPS or MAF
Cleaning the MAF, TPS, or BARO sensor with a sensor safe cleaner
Updating the ECM with the latest software
Some models such as Honda or Acura built the BARO sensor inside of the ECM. These models are also the most common which the BARO sensor fails. If the BARO sensor is determined to be bad, the entire ECM must be replaced.
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.