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DTC P2228 or P2229 (LLU)

DTC P2228 or P2229 (LLU)

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 P2228 00

Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229 00

Barometric Pressure (BARO) Sensor Circuit High Voltage

Circuit/System Description

The barometric pressure (BARO) sensor is integrated within the engine control module (ECM). The BARO sensor voltage signal is converted by the ECM for display on the scan tool as the BARO Sensor kPa parameter. The BARO sensor signal varies, according to changes in altitude and atmospheric conditions. This gives the ECM an indication of the current barometric pressure. The ECM uses this information for numerous internal calculations. The ECM monitors the BARO sensor signal for voltages/pressures that are not within a normal range. The ECM also monitors the stability of the BARO sensor signal by comparing successive samples.

Conditions for Running the DTC


• The ignition is ON.

• The ignition voltage is greater than 8 V.

• These DTCs run continuously when the above conditions are met.


Conditions for Setting the DTC

P2228 00

The ECM detects that the BARO sensor voltage signal is less than 0.19 V for greater than 2 s.

P2229 00

The ECM detects that the BARO sensor voltage signal is greater than 4.88 V for greater than 2 s.

Action Taken When the DTC Sets


• DTCs P2228 00, and P2229 00 are Type C DTCs.

• The service vehicle soon indicator will illuminate.

• The ECM will default to a calibrated BARO value.


Conditions for Clearing the DTC

DTCs P2228 00, and P2229 00 are Type C DTCs.

Diagnostic Aids


• If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected.

• A high resistance condition on the accelerator pedal position (APP) sensor circuits may cause a DTC to set.


Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

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 OFF for 90 s, determine the current vehicle testing altitude.

2. Ignition ON, engine OFF, observe the scan tool BARO voltage parameter, and Boost Pressure Sensor voltage parameter. Compare the parameters to the Altitude Versus Barometric Pressure table. The parameters should be within the specified range indicated in the table.

3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.


Circuit/System Testing


1. Inspect the atmospheric vent on the ECM case for the following conditions:

• Moisture in the vent inlet

• Debris in the vent inlet

2. If a condition exists, carefully attempt to clean or dry the atmospheric vent inlet on the ECM.

3. Clear the DTC, and operate the vehicle within the conditions for running the DTC to verify the DTC does not reset.

4. If the DTC will not clear or continues to reset, replace the K20 Engine Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming