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P2227




DTC P2227-P2229 or P2230 (Heavy Duty L96)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (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





Circuit/System Description

The barometric pressure (BARO) sensor is integral to the throttle inlet absolute pressure sensor and responds to changes in altitude and atmospheric conditions. This gives the engine control module (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
* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P2101, P2135, P2228, or P2229 is not set.
* The engine is running.
OR
* DTC P0106, P0107, P0108, P2228, P2229, P2230, or P2610 is not set or pending.
* The ignition is ON, the engine is OFF.
* The time between the current ignition cycle and the last time the engine was running is greater than 5 s.
* DTC P2227 runs continuously when the above conditions are met.

P2228 or P2229
* The 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, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P2101, P2135, P2228, or P2229 is not set.
* The engine is running.
* DTC P2230 runs continuously when the above conditions are met.

Conditions for Setting the DTC

P2227
* Engine running, the ECM detects that the difference between the BARO signal and the calculated BARO is greater than 15 kPa (2.2 psi) when the vehicle has traveled no more than 0.6 km (0.4 mi) since the last calculated BARO update, or if the difference is greater than 20 kPa (2.9 psi) when the vehicle has traveled greater than 0.6 km (0.4 mi) since the last calculated BARO update.
* 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).

P2228

The ECM detects that the BARO sensor voltage is less than 2 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 difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa (1.5 psi) for greater than 5 s.

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

Inspect the inlet port on the throttle inlet absolute pressure sensor for moisture or debris and attempt to dry or clean the inlet, if contaminated.

Reference Information
Schematic Reference

Engine Controls Schematics (except L96) ([1][2]Electrical Diagrams)Engine Controls Schematics (L96) ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Control Module References)for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641 or P0651 is not set.

• If the above DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 (ECM, L96) (P0641) for further diagnosis.

2. Ignition ON, observe the scan tool BARO parameter. Compare the parameter to the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The BARO parameter should be within the specified range indicated in the table.
3. Engine running observe the DTC information with a scan tool. DTCs P2227, P2228, P2229, or P2230 should not set.
4. 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. Ignition OFF, disconnect the harness connector at the B192 throttle inlet absolute pressure sensor.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 2 or B and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 or A and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Verify the scan tool BARO Sensor parameter is less than 1 kPa (0.2 psi).

• If greater than the specified range, test the signal circuit terminal 3 orC for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 or C and the 5 V reference circuit terminal 1 or A. Verify the scan tool BARO Sensor parameter is greater than 127 kPa (18.4 psi).

• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

6. If the circuits test normal, replace the B192 throttle inlet absolute pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Throttle Inlet Absolute Pressure Sensor Replacement (Service and Repair)
* Control Module References (Control Module References)for engine control module replacement, setup, and programming

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