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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 19 (ENGINE CONTROLS - 2.0L - DTC P2101 TO DTC P2229)DTC P2228TEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different variant/trim than selected.

The number below refers to the step number on the diagnostic table.

  1. 2:  The BARO sensor 5-volt reference circuit is shared with other sensors. If DTC P0641 is set, this indicates a shorted 5-volt reference circuit or a shorted component and should be diagnosed first.
DTC P2228

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC Information with a scan tool.
Is DTC P0641 set?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3 Observe the BARO parameter with a scan tool.
Is the BARO parameter less than the specified value?		 0.51 V Go to Step 5  Go to Step 4 
4
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 5  Go to Testing for Intermittent Conditions and Poor Connections
5
IMPORTANT: The connectors for the following sensors are of the same configuration, but are not interchangeable.
  1. Observe the engine controls schematics for the barometric pressure (BARO) sensor and for the supercharger inlet pressure (SCIP) sensor and note the circuit colors.
  2. Inspect the wiring harness of the BARO sensor for the proper connection.
  3. Inspect the wiring harness of the SCIP sensor for the proper connection.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 6 
6 Test for an intermittent and for a poor connection at the BARO sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 7 
7
  1. Disconnect the BARO sensor electrical connector.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure the voltage from the 5-volt reference circuit of the BARO sensor to a good ground with a DMM.
Is the voltage more than the specified value?		 4.8 V Go to Step 8  Go to Step 9 
8
  1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the BARO sensor and the signal circuit of the BARO sensor.
  2. Observe the BARO parameter with the scan tool.
Is the BARO parameter more than the specified value?		 4.8 V Go to Step 12  Go to Step 10 
9 Test the 5-volt reference circuit of the BARO sensor for an open. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
10 Test the signal circuit of the BARO sensor for an open or a short to ground. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
11 Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
12 Replace the BARO sensor. Refer to Barometric Pressure (BARO) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 14  -
14
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 15 
15 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.