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 P0123

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Turn ON the ignition, with the engine OFF. Observe the throttle position (TP) sensor 1 voltage with a scan tool. Is the TP sensor 1 voltage more than the specified value?	4.6 V	Go to Step 5	Go to Step 3
3	Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition?	-	Go to Step 5	Go to Step 4
4	Observe the DTC information with a scan tool. Slowly depress the accelerator pedal to wide-open throttle (WOT) and then slowly return it to the closed position. Repeat this action several times. Did the DTC fail this ignition?	-	Go to Step 18	Go to Intermittent Conditions
5	Turn OFF the ignition. Disconnect the throttle body harness connector. Refer to Throttle Body Assembly Replacement . Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the TP sensor 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 10
6	Measure the voltage from the signal circuit of the TP sensor 1 to a good ground with a DMM. Is the voltage within the specified range?	4.6-4.9 V	Go to Step 7	Go to Step 12
7	Turn OFF the ignition for 30 seconds. IMPORTANT: It may be necessary to remove the ECM/TCM fuse to allow the ECM to power down. Allow the engine control module (ECM) to completely power down. This can be verified by the loss of communication on the scan tool. Measure the resistance from the low reference circuit of the TP sensor 1 to a good ground with a DMM. Is the resistance less than the specified value?	5ohm	Go to Step 15	Go to Step 8
8	Test the low reference circuit of the TP sensor 1 for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 9
9	Measure the resistance from the case of the ECM to battery ground. Is the resistance less than the specified value?	5ohm	Go to Step 16	Go to Step 14
10	Turn OFF the ignition. Disconnect the accelerator pedal position (APP) sensor harness connector. Refer to Accelerator Pedal Position (APP) Sensor Replacement . Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the TP sensor 1 to a good ground with a DMM. Is the voltage within the specified range?	4.8-5.2 V	Go to Step 17	Go to Step 11
11	Test the 5-volt reference circuit of the TP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 13
12	Test the signal circuit of the TP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 16
13	Test the 5-volt reference circuit of the APP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 16
14	Repair the open or high resistance in the ECM ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 20	-
15	Test for an intermittent and for a poor connection at the at the TP 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 20	Go to Step 18
16	Test for an intermittent and for a poor connection at the at the 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 20	Go to Step 19
17	Test the signal circuit of the APP sensor 2 for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	-
18	Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement?	-	Go to Step 20	-
19	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 20	-
20	Clear the DTCs with a scan tool. Turn OFF the ignition. Turn ON the ignition. 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 21
21	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK