Buick Regal: DTC P2227-P2230

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2227

Barometric Pressure (BARO) Sensor Performance

DTC P2228

Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

Barometric Pressure (BARO) Sensor Circuit High Voltage

DTC P2230

Barometric Pressure (BARO) Sensor Circuit Erratic

Diagnostic Fault Information

Typical Scan Tool Data

BARO

Circuit/System Description

The barometric pressure (BARO) sensor is integral to the multifunction intake air sensor and responds to changes in altitude and atmospheric conditions. This gives the ECM an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.

Conditions for Running the DTC

P2227

• Engine is running.
  • DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0121, P0122, P0123, P0222, P0223, P1516, P2101, P2135, P2228, or P2229 is not active.
  • DTC P2227 runs continuously when the above conditions are met.

    OR

• Ignition is On, engine is Off for at least 10 s.
  • DTC P0106, P0107, P0108, P2228, P2229, P2230, or P2610 is not active.
  • DTC P0107, P0108, P2228, or P2229 is not pending.
  • DTC P2227 runs continuously when the above conditions are met.

P2228 or P2229

• Engine is running.
• The DTCs run continuously when the above condition is met.

P2230

• DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0121, P0122, P0123, P0222, P0223, P1516, P2101, P2135, P2228, or P2229 is not set.
• Ignition is On
• DTC P2230 runs continuously when the above conditions are met.

Conditions for Setting the DTC

P2227

• The engine is running.
  • The ECM detects that the difference between the actual BARO and the calculated BARO is greater than 15 kPa when the distance traveled since the last calculated BARO update is less than or equal to 0.1 km (0.06 mi).

    OR

  • The ECM detects that the difference between the actual BARO and the calculated BARO is greater than 20 kPa when the distance traveled since the last calculated BARO update is greater than 0.1 km (0.06 mi).

    OR

• Ignition On, engine Off
  • The ECM detects that the BARO pressure is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi).

    OR

  • The ECM detects that the absolute value of the difference between MAP and actual BARO is greater than 10 kPa and the absolute value of the difference between Boost Pressure and MAP is less than or equal to 10 kPa and the absolute value of the difference between Boost Pressure and BARO is greater than 10 kPa.

P2228

The ECM detects that the BARO sensor voltage is less than 1.7 V for greater than 5 s.

P2229

The ECM detects that the BARO sensor voltage is greater than 4.5 V for greater than 5 s.

P2230

The ECM detects that the cumulative difference between BARO sensor readings, over a specific length of time, is greater than a calibrated threshold.

Action Taken When the DTC Sets

DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.

Diagnostic Aids

A skewed boost pressure sensor (Turbocharger Boost/Intake Air Temperature Sensor) may cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Wiring Schematics (LTG)

Connector End View Reference

Component Connector End View Index

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition On.

2. Verify the scan tool BARO parameter is within the range specified in the Altitude Versus Barometric Pressure table.

• If the BARO is not within the specified range

Refer to Circuit/System Testing.

• Go to next step: If the BARO is within the specified range

3. Verify the scan tool Boost Pressure parameter and the BARO parameter are within 3 kPa (0.43 PSI).

• If not within 3 kPa (0.43 PSI)

Refer to DTC P0236.

• Go to next step: If within 3 kPa (0.43 PSI)

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

• If the DTC sets

Refer to Circuit/System Testing.

• Go to next step: If the DTC does not set

6. All OK.

Circuit/System Testing

1. Verify the conditions listed below do not exist with the B75C Multifunction Intake Air Sensor:

• Damage
• Restrictions in the inlet port
• If a condition exists

Repair or replace the B75C Multifunction Intake Air Sensor as necessary.

• Go to next step: If none of the conditions exist

2. Ignition Off, and all vehicle systems Off, it may take up to 2 min for all vehicle systems to power down. Disconnect the harness connector at the B75C Multifunction Intake Air Sensor.

3. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.

• If 5 Ω or greater

1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
   • If greater than the specified value, repair the open or high resistance in the circuit.
   • If 2 Ω or less replace the K20 Engine Control Module.

• Go to next step: If less than 5 Ω

4. Ignition On.

5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 2 and ground.

• If less than 4.8 V

1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
3. Test for less than 2 Ω in the 5 V reference circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, replace the K20 Engine Control Module.

• If greater than 5.2 V

1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
2. Test for less than 1 V between the 5 V reference circuit and ground.
   • If 1 V or greater, repair the short to voltage on the circuit.
   • If less than 1 V, replace the K20 Engine Control Module.

• Go to next step: If between 4.8 - 5.2 V

6. Verify the scan tool BARO Sensor parameter is less than 0.2 V.

• If 0.2 V or greater

1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.
   • If 1 V or greater, repair the short to voltage on the circuit.
   • If less than 1 V, replace the K20 Engine Control Module.

• Go to next step: If less than 0.2 V

7. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 2.

8. Verify the scan tool BARO Sensor parameter is greater than 4.5 V.

• If 4.5 V or less

1. Ignition Off, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
3. Test for less than 2 Ω in the signal circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, replace the K20 Engine Control Module.

• Go to next step: If greater than 4.5 V

9. Test or replace the B75C Multifunction Intake Air Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Mass Airflow Sensor with Intake Air Temperature Sensor Replacement for multifunction intake air sensor replacement
• Control Module References for engine control module replacement, programming, and setup

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