Always fix the P codes before trying to diagnose the U codes.
28 - DTC-Based Diagnostics / MODULE, Powertrain Control (PCM) / Diagnosis and Testing
P16A0-00-ETC MOTOR ERROR POSITION
When Monitored and Set Conditions
When Monitored: This diagnostic runs when the following conditions are met:
•With the engine running.
•Throttle learn completed
Set Conditions:
•When the Powertrain Control Module (PCM) detects that the throttle blade is not tracking the commanded position properly.
Default Actions:
•MIL light will illuminate.
Possible Causes
COKING OR BLOCKAGE OF THE THROTTLE PLATE
AUTOMATIC SHUTDOWN (ASD) RELAY
ETC MOTOR/THROTTLE BODY
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
1.CHECK FOR AN ACTIVE DTC
NOTE: Diagnose and repair any Throttle Position Sensor DTCs before continuing.
NOTE: If DTC P2102-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT LOW is set along with this DTC, perform that diagnostic routine before continuing with this DTC diagnosis.
1. Start the engine and allow it to idle.
2. With the scan tool, read DTCs and record on the repair order.
Is the DTC active or pending?
Yes
•Go To 2
No
•Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2.THROTTLE PLATE INSPECTION
1. Turn the ignition off.
2. Remove the Air Cleaner Assembly from the Throttle Body.
3. Inspect for any signs of coking or a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Manually move the throttle plate and check for any sticking.
Were any signs of foreign material or scoring of the throttle plate or bore found?
Yes
•Clean the throttle blade and bore if possible or replace the Throttle Body Assembly if necessary. (Refer to 14 - Fuel System/Fuel Injection/THROTTLE BODY - Removal) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the THROTTLE BODY SELF LEARN.
•Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
•Go To 3
3.CHECK THE ETC MOTOR
1. Disconnect the Throttle Body harness connector.
2. Check the connector and terminals for any corroded, pushed out or damage.
Were any problems found?
Yes
•Perform the appropriate repair.
•Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
•Replace the Throttle Body Assembly. (Refer to 14 - Fuel System/Fuel Injection/THROTTLE BODY - Removal) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the THROTTLE BODY SELF LEARN.
•Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
28 - DTC-Based Diagnostics / MODULE, Transmission Control (TCM), C635 DDCT / Diagnosis and Testing
U11C6-00-LOST ENGINE TORQUE REQUEST MESSAGE
Theory of Operation
This diagnostic determines the availability of the static indicated engine torque signal, the engine friction torque signal and the indicated driver torque request signal sent by the Powertrain Control Module (PCM) via two CAN messages. The diagnostic determines the availability by checking the valid bit.
•When Monitored:
Ignition key is ON and the engine is not in cranking mode.
Power supply must be between 7 volts and 24 volts and the Main Micro Processor (MMP) supply diagnostics have not failed.
The Bus OFF failure is not present, the CAN communication between the TCM and PCM is not lost, there are no dual port RAM faults and the CAN messages were read at least once.
Parity check and Toggle bit check of the messages indicate no faults.
•Set Condition:
When the signals are not available, the PCM sends a SNA default value to the TCM. If the TCM reads this value then DTC U11C6 is set.
Possible Causes
PCM - INTERNAL ERROR
TRANSMISSION CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
1.CHECK FOR BCM CAN BUS DTCS
1. With the scan tool, read BCM DTCs.
Are any BCM CAN BUS DTC's present?
Yes
•(Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) /Diagnosis and Testing) and perform the appropriate diagnostic procedure. Perform the diagnostic procedure for DTC U0001-CAN C BUS first if it is present.
•Perform C635 DDCT TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
•Go To 2
2.CHECK IF ENGINE DTC'S ARE PRESENT
1. With the scan tool, read engine DTCs.
Are any engine DTC's present?
Yes
•Refer to 28 - DTC-Based Diagnostics and perform the appropriate diagnostic procedure.
•Perform C635 DDCT TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
•Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance to the Service Information.
•Perform C635 DDCT TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
28 - DTC-Based Diagnostics / MODULE, Body Control (BCM) / Diagnosis and Testing
U0401-86-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM - SIGNAL INVALID
•When Monitored:
With the ignition on.
•Set Condition:
Incorrect data received from the Powertrain Control Module (PCM).
Possible Causes
NO COMMUNICATION WITH THE POWERTRAIN CONTROL MODULE (PCM)
DTCS STORED OR ACTIVE IN THE PCM
BODY CONTROL MODULE (BCM)
1.CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. With the scan tool, read active DTCs.
Does the scan tool display this DTC as active?
Yes
•Go To 2
No
•The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).
2.VERIFY THE PCM IS ACTIVE ON THE CAN BUS
1. With the scan tool, verify that the PCM is active on the bus.
NOTE: If any DTCs are stored in the PCM, repair those first before proceeding.
Is the PCM active on the bus?
Yes
•Replace and program the BCM in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Body Control - Removal) .
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).
No
•(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the No Response from PCM diagnostic procedure.
•Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).
28 - DTC-Based Diagnostics / MODULE, Body Control (BCM) / Diagnosis and Testing
U0415-86-IMPLAUSIBLE DATA RECEIVED FROM ABS - SIGNAL INVALID
•When Monitored:
With the ignition on for at least five seconds.
Battery voltage between 10 and 16 volts.
Body Control Module (BCM) is configured correctly.
•Set Condition:
Whenever the communication data sent over the CAN BUS from the ABS Module is missing part of the message, the message is corrupted, or the message is an irrational value.
Possible Causes
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
BCM NOT CONFIGURED CORRECTLY
ABS MODULE POWERS OR GROUNDS
ABS MODULE
MODULE THAT SET THIS DTC
1.VERIFY DTC IS ACTIVE
NOTE: Make sure the battery voltage is between 10 and 16 volts before proceeding.
1. With the scan tool, read active DTCs.
Is this DTC active?
Yes
•Go To 2
No
•(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.
2.CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read all active DTCs from all modules.
NOTE: Check for BCM configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
•Go to and perform the appropriate diagnostic procedure.
No
•Go To 3
3.VERIFY THE ABS MODULE IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, verify the ABS Module is active on the bus.
Is the ABS Module active on the bus?
Yes
•Go To 4
No
•(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the NO RESPONSE FROM ABS MODULE diagnostic procedure.
4.CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, read all the DTCs.
Is there more than one module with active DTCs “Logged Against” the ABS Module?
Yes
•Replace/update the ABS Module in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Anti-Lock Brake System - Removal) .
•Perform the ABS MODULE VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
•Go To 5
5.CLEAR DTC IN MODULE SETTING FAULT
1. With the scan tool, select the module setting the DTC against the ABS Module.
2. Clear active DTCs.
Is this DTC still active?
Yes
•Replace/update the module that set this DTC in accordance with the Service Information.
•Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).
No
•The condition is not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
•Perform the appropriate verification test for the module. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure).
