Conditions for Clearing the MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

DTC P012B

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module 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	Observe the DTC information with a scan tool Are DTCs P0641, P2228, P2229 set?	-	Go to DTC P0641 or P0651 , and DTC P2228 or P2229	Go to Step 3
3	IMPORTANT: The harness connectors for the following sensors are of the same configuration but are not interchangeable. Turn OFF the ignition. Review the engine controls schematics for the barometric pressure (BARO) sensor and for the supercharger inlet absolute pressure (SCIAP) sensor and note the circuit colors. Inspect the wiring harness of the BARO sensor for the proper connection. Inspect the wiring harness of the SCIAP sensor for the proper connection. Did you find and correct the condition?	-	Go to Step 18	Go to Step 4
4	Inspect for the following conditions: Disconnected, damaged, or incorrectly routed vacuum hoses A supercharger or engine vacuum leak A misaligned, loose, or damaged air intake duct Any objects blocking the air inlet probe of the mass air flow (MAF)/Intake air temperature (IAT) sensor Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor Any damage or fractures to the SCIAP sensor housing Restrictions or debris in the SCIAP sensor vacuum port Did you find and correct the condition?	-	Go to Step 18	Go to Step 5
5	Inspect the throttle body and the throttle valve for the following conditions: Any damage Any restriction that could affect the air flow through it A vacuum leak at the throttle body Any missing parts A throttle valve that is not fully open when the accelerator pedal is fully depressed Did you find and correct the condition?	-	Go to Step 18	Go to Step 6
6	Test for an intermittent and for a poor connection at the SCIAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 7
7	Disconnect the SCIAP sensor electrical connector. Observe the SC Inlet Pressure Sensor parameter with a scan tool. Is the SC Inlet Pressure Sensor parameter less than the specified value?	0.1 V	Go to Step 8	Go to Step 11
8	Turn ON the ignition, with the engine OFF. Connect a test lamp between the 5-volt reference circuit of the SCIAP sensor at the harness connector and a good ground. Measure the voltage from the 5-volt reference circuit of the SCIAP sensor to a good ground with a DMM. Is the voltage within the specified range?	4.8-5.2 V	Go to Step 10	Go to Step 9
9	Is the voltage more than the specified value?	5.2 V	Go to Step 12	Go to Step 13
10	IMPORTANT: All electrical components and accessories must be turned OFF. Turn OFF the ignition for 90 seconds to allow the control modules to power down. Measure the resistance from the low reference circuit of the SCIAP sensor to a good ground with a DMM. Is the resistance more than the specified value?	5 ohm	Go to Step 14	Go to Step 16
11	Test the SCIAP sensor signal circuit between the engine control module (ECM) and the SCIAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
12	Test all branches of the 5-volt reference circuit that is shared with the SCIAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
13	Test the 5-volt reference circuit between the ECM and the SCIAP sensor for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
14	Test the low reference circuit between the ECM and the SCIAP sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
15	Test for shorted terminals and for poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 17
16	Replace the SCIAP sensor. Refer to Supercharger Inlet Absolute Pressure Sensor Replacement . Did you complete the replacement?	-	Go to Step 18	-
17	Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 18	-
18	Clear the DTCs with a scan tool. Turn OFF the ignition for 90 seconds. Start the engine. 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 19
19	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