Conditions for Clearing the MIL/DTC

WARNING: This page is about a different variant/trim than selected.

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 P2127

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 in Vehicle DTC Information
2	Turn ON the ignition, with the engine OFF. Observe the accelerator pedal position (APP) sensor 2 parameter with a scan tool. Is the APP sensor 2 voltage less than the specified value?	0.3 V	Go to Step 5	Go to Step 3
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 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 5	Go to Step 4
4	Clear the DTCs with a scan tool. Slowly depress the accelerator pedal to wide open throttle (WOT), then slowly return the accelerator pedal to the rest position. Repeat this action several times. Did the DTC fail this ignition?	-	Go to Step 14	Go to Intermittent Conditions
5	Turn OFF the ignition. Disconnect the APP sensor harness connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the APP sensor 2 to a good ground with a DMM. Is the voltage within the specified range?	4.8-5.2 V	Go to Step 6	Go to Step 7
6	Turn OFF the ignition. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 2 and the signal circuit of the APP sensor 2. Turn ON the ignition, with the engine OFF. Observe the APP sensor 2 parameter with a scan tool. Is the APP sensor 2 voltage within the specified value?	4.8-5.2 V	Go to Step 11	Go to Step 9
7	Disconnect all components that share the 5-volt reference voltage source one at a time. Measure the voltage from the 5-volt reference circuit of the APP sensor 2 to a good ground with a DMM. Is the voltage within the specified range after disconnecting each component?	4.8-5.2 V	Go to Step 13	Go to Step 8
8	Test the 5-volt reference circuit of the APP sensors for the following conditions: A short to ground High resistance An open circuit Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 10
9	Test the signal circuit of the APP sensor 2 for the following conditions: A short to ground A short to the low reference circuit High resistance An open circuit Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 12
10	Test the 5-volt reference circuit of the throttle position (TP) sensors for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 12
11	Test for an intermittent and for a poor connection at the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 14
12	Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 15
13	Replace the component that, when disconnected, caused the voltage to return to the specified value in step 10. Refer to the appropriate replacement procedure. Did you complete the replacement?	-	Go to Step 16	-
14	Replace the accelerator pedal assembly. Refer to Accelerator Pedal Position Sensor Replacement . Did you complete the replacement?	-	Go to Step 16	-
15	Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 16	-
16	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 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 17
17	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 in Vehicle DTC Information	System OK