Diagnostic Aids

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

A module which loses power during the current ignition cycle, will have a Loss of Communication DTC set by the other modules that require information from the failed module.
If the TCM, using a faulty manifold absolute pressure (MAP) signal, calculates an invalid torque value, the TCM will command ECM intervention and set a DTC P0701.
If there is an active vehicle speed malfunction in the TCM, DTC P0701 will set.
If the ECMs ignition 1 voltage circuit, that is used to wake up the module is open, the TCM may set a DTC U2105 and request a limp-home mode, which will result in DTC P0701 also being set.

DTC P0701

Step	Action	Yes	No
Schematic Reference: Engine Controls Schematics and Data Link Connector (DLC) Schematics (A/T) or Data Link Connector (DLC) Schematics (M/T) in Computer/Integrating Systems. Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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. Attempt to establish communication with the engine control module (ECM). Does the scan tool communicate with the ECM?	Go to Step 3	Go to Scan Tool Does Not Communicate with Class 2 Device in Computer/Integrating Systems
3	Select the DTC Information for the body control module (BCM), on the scan tool. Does the scan tool display any DTCs which begin with a U?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	Go to Step 4
4	Select the DTC Information for the ECM. Does the scan tool display DTC P0107 or DTC P0108?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	Go to Step 5
5	Select the DTC Information for the ECM. Does the scan tool display DTC P0502 or DTC P0503?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	Go to Step 6
6	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 7
7	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