Fix P2227: Mechanic’s solutions that WORKED

The code P2227: Barometric Pressure Sensor Circuit Range/Performance signifies an issue with the Barometric Pressure Sensor Circuit’s range or performance, affecting how the engine reads and reacts to atmospheric pressure. This code is commonly triggered by a faulty sensor, wiring issues, or air system restrictions and can lead to changes in engine performance and efficiency.

P2227 quick overview

Meaning	P2227: Barometric Pressure Sensor Circuit Range/Performance
Is it serious?	This code can affect the vehicle’s performance and fuel efficiency, so it’s important to address it, though it might not cause immediate breakdown.
Possible causes	– Faulty barometric pressure sensor – Issues with related sensors like the MAP or TPS – Wiring or connection problems affecting the sensor circuit – Air inlet restrictions or exhaust system blockages – Software issues or the need for PCM updates – Environmental factors like altitude changes
How to diagnose?	Check Sensor and Wiring: Inspect the barometric pressure sensor and its connections for damage or corrosion. Compare Readings: Compare the sensor readings to known ambient values to check for plausibility. Inspect Air Intake: Look for restrictions or blockages in the air intake system. Review PCM and Updates: Check the PCM for proper operation and any available software updates. Consult TSBs: Look up any technical service bulletins related to P2227 for your specific vehicle. Test Related Sensors: Examine the MAP and TPS sensors to ensure they’re functioning correctly. Clear and Recheck Codes: After repairs, clear the codes and monitor if P2227 returns.

How to fix P2227 – learn from mechanics

I looked into P2227 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Honda

Vehicle Information:
2004 Honda Accord EX 2.4L

Issue + Repair History:

• Car was flooded; engine replaced about a month ago.
• Encountered MIL with code P2227 (BARO Sensor Circuit Range/Performance Problem).
• Replaced and used PCM, but the issue persisted with the same code.

Other OBD2 Codes + Test Results:

• P2227 – BARO Sensor Circuit Range/Performance Problem.

Suggestions to Fix Issue:

• Recheck powers and grounds at computer with a test light.
• Consider the possibility of a wiring issue if a new ECM throws the same code.
• Check if the BARO sensor is functioning correctly, as it might be confused with the MAP sensor.
• Another PCM might be tried since the first one was used.
• Graph the sensor to catch any glitches in the signal.
• Compare MAP sensor readings with the engine off to the BARO readings.
• Monitor TPS, MAP, and Baro during a WOT to ensure readings are consistent.
• Check for a glitching TPS sensor and ensure it’s reading correctly.
• Inspect the intake for blockages that could be causing false DTCs.

Final Fix:

• The issue was the TPS. Replacing a used throttle body resolved the engine light and improved transmission shifting.

Case #2: Porsche

Vehicle Information:
2008 Porsche Cayenne S 4.8L

Issue + Repair History:

• Numerous codes with the check engine light on.
• After clearing codes and driving, several codes including P0455, P0431, P0421, and Gateway-1336 & 459 appeared.
• Found a vacuum hose disconnected and performed a battery hard reset; engine codes disappeared after the road test, but some Gateway and instrument codes returned.
• No repair history available as the vehicle was from an auction.

Other OBD2 Codes + Test Results:

• P0455: Tank system major leak no signal.
• P0431: Cat efficiency bank 2.
• P0421: Primary cat bank 1 inadequate.
• Gateway-1336: CAN comfort open circuit.
• 459 PCM/CDR.
• P2227: Ambient pressure implausible, exceeds limit.

Suggestions to Fix Issue:

• Check if the battery box under the driver’s seat is full of water.
• Inspect the area around the driver’s seat for dryness and corrosion-free conditions.
• Check if network wires fell apart due to potential water damage from sunroof leaking.
• Pull the rubber plugs on the rockers to see if they are full of water.

Final Fix:

• The vehicle is not fully repaired yet. Engine oil was changed, both MAF and throttle body were cleaned, resulting in temporary good results. B2S2 was changed after P0431 code reappeared. While the vehicle is showing some improvements, the resolution is still pending, and further updates are anticipated.

Case #3: Chevrolet

Vehicle Information:
2014 Chevrolet Cruze LT 1.4L

Issue + Repair History:

• Vehicle experienced hesitation and low boost, with a tendency to hang in 4th gear up to about 4000 RPM and not shift until the accelerator was released.
• Initial suspicion was a transmission issue, leading to fluid replacement and transmission control module replacement with reprogramming.
• Observed low boost condition with the requested boost pressure being sometimes 10psi higher than actual under load.
• Found a huge crack from wastegate housing to the edge of the turbo and replaced the turbocharger, boost pressure sensor, and MAF without significant change.
• Performance temporarily improved after clearing codes until P0299 was triggered again, then the vehicle seemed to enter a reduced power mode.

Other OBD2 Codes + Test Results:

• P0299: Engine Underboost.
• P2227: BARO/Barometric Sensor Performance.

Suggestions to Fix Issue:

• Check for intake or exhaust restriction.
• Inspect exhaust back pressure for potential catalytic converter issues.
• Ensure there are no leaks in boost pressure hoses.
• Verify all pressure sensors read close to the same voltage KOEO.
• Examine the plastic intake manifold for splits or warping.
• Smoke test the system for any leaks.
• Consider related TSBs for P0299 and P2227, especially regarding cold weather and intercooler icing.

Final Fix:

• Found a tight ball of leaves and corn fodder in the air intake tract near the grille, causing air restriction. After removing the blockage, the problem was resolved. The manifold was replaced due to a missing check valve, which slightly improved the condition.

Case #4: Acura

Vehicle Information:
2005 Acura MDX Touring 3.5L

Issue + Repair History:

• The vehicle displayed a MIL with code P2227 (BARO sensor circuit).
• MAP sensor and ECM were replaced to address the issue, but the problem persisted.

Other OBD2 Codes + Test Results:

• P2227: BARO Sensor Circuit Range/Performance Problem.

Suggestions to Fix Issue:

• Refer to TSB ASN0707-03 for potential guidance.
• Inspect the air inlet boot for rips or cracks.
• Check for restrictions in the air filter duct.
• Consider potential issues with relay contacts or wiring problems in Acura models.
• Perform a wiring overlay of the BARO sensor circuit, ensuring to use appropriate wire types and follow the wire diagram accurately.
• Examine the air inlet for restrictions, poor connections, and leaks as per the technical service bulletin.

Final Fix:

• Replaced the ECM again with another used unit, after which the code did not return.

Case #5: GMC

Vehicle Information:
2004 GMC Sierra 2500 HD 6.6L

Issue + Repair History:

• MIL with codes P0404 (EGR range/performance), P2227 (Barometric Pressure Sensor), and P1404 (EGR Closed Position Performance).
• Replaced EGR vacuum pump due to smoke testing indicating a leak, but the P0404 code remained.
• Considered replacing the EGR valve and/or EGR pressure sensor.

Other OBD2 Codes + Test Results:

• P0404, P2227, and P1404.
• The barometric pressure was observed to be more than the 72 kPa condition for setting DTC P0404.

Suggestions to Fix Issue:

• Review the vacuum sensor, MAP sensor, EGR valve, and check if the ports are clogged.
• Consider a software update as per a GM bulletin for EGR issues.
• Clean the MAF sensor and consider the OE air filter.
• Understand that barometric pressure is dependent on altitude and air pressure, and the observed value should be close to the ambient.

Final Fix:

• Replaced the EGR valve and continued road testing. After approximately 20 miles, no DTCs were reported.

Advice	Brief Description of Diagnostic Step
Check for air inlet restrictions	Inspect the air intake tract for any blockages or restrictions that could affect pressure readings.
Inspect the PCM and wiring	Ensure that the PCM is functioning correctly and that all related wiring is intact and free from corrosion or damage.
Examine related sensors	Look at the MAP sensor and TPS to ensure they are providing accurate readings and not contributing to the issue.
Consider altitude and weather	Understand that barometric pressure readings can be influenced by altitude and weather conditions; compare readings to expected ambient values.
Check for software updates	Look for any available updates for the vehicle’s software that may address known issues with the P2227 code.
Review TSBs and bulletins	Consult technical service bulletins and other manufacturer communications for known issues and recommended fixes related to P2227.
Check the EGR system	Examine the EGR valve, vacuum pump, and related components for faults or clogs that might impact pressure readings.
Look for exhaust restrictions	Ensure there are no blockages or issues in the exhaust system that could affect pressure measurements.