3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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DTC P1516, P2101, P2119, or P2176 (LUW, LWE)
Applies to:
1.8L (LUW, LWE)
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P1516
Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P2101
Throttle Actuator Position Performance
DTC P2119
Throttle Closed Position Performance
DTC P2176
Minimum Throttle Position Not Learned
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
TAC Motor Control Closed
P1516, P2101,
P2176
P1516, P2101,
P2176
P1516, P2101,
P2176
P1516, P2101,
P2176
TAC Motor Control Open
P1516, P2101,
P2176
P1516, P2101,
P2176
P1516, P2101,
P2176
P1516, P2101,
P2176
Circuit/System Description
The Engine Control Module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of
the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle
valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position.
Conditions for Running the DTC
P1516
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3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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DTC P1682 is not set.
The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
DTC P1516 runs continuously when the above conditions are met.
P2101
DTC P1682 is not set.
The run/crank or powertrain relay voltage is greater than 5.5 V and reduced power is not active.
The engine is running or the following conditions are met:
The engine is not running.
The ignition voltage is greater than 11 V.
The TAC system is not in the Battery Saver mode.
The ECM is commanding the throttle.
The ECM has learned the minimum throttle position.
DTC P2101 runs continuously when the above conditions are met.
P2119
The ignition is ON.
DTC P0121, P0122, P0123, P0222, P0223, P0697, P06A3, or P2135 is not set.
The run/crank or powertrain relay voltage is greater than 5.5 V and reduced power is not active.
DTC P2119 runs continuously when the above conditions are met.
P2176
The ignition is ON.
The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
The ECM enable the minimum throttle learn procedure.
DTC P2176 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P1516
The ECM detects an unstable throttle position for greater than 1 s.
P2101
The ECM detects the actual throttle position does not match the predicted throttle position for greater than 1 s.
P2119
The ECM detects the throttle blade did not return to the default position when the TAC motor is de-energized for
greater than 1 s.
P2176
The ECM detects that both throttle position (TP) sensors were greater than a predetermined voltage during the
minimum throttle learn procedure for greater than 2 s.
Action Taken When the DTC Sets
DTCs P2101 and P2176 are Type A DTCs.
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3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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DTC P1516 is a Type B DTC.
DTC P2119 is a Type C DTC.
The control module commands the TAC system to operate in the Reduced Engine Power mode.
A message center or an indicator displays Reduced Engine Power.
Under certain conditions, the control module commands the engine OFF.
Conditions for Clearing the MIL/DTC
DTCs P2101, and P2176 are Type A DTCs.
DTC P1516 is a Type B DTC
DTC P2119 is a Type C DTC.
Diagnostic Aids
Depending on the Start Up ECT, the Desired Throttle Position percentage maybe greater or less than the
Throttle Position with the TAC motor at rest. When the ignition is initially turned ON, or when the engine is
cranking or running the Desired and Actual Throttle positions should closely match.
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have
formed in the throttle bore causing the throttle valve not to close.
A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC
to set.
A low battery condition may cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Throttle Actuator Control (TAC) System Description
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
Note: A low battery voltage or charging system condition may cause a DTC to set.
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3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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2. Verify DTC P0121, P0122, P0123, P0222, P0223, P0562, P0621, P0622, or P2135 is not set.
If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
If none of the DTCs are set
Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90 %.
If 90 % or greater
Refer to Throttle Body Inspection and Cleaning.
If less than 90 %
Clear the DTCs with a scan tool.
Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
Ignition ON.
Verify the scan tool TAC Motor parameter displays Enabled while slowly depressing the accelerator pedal.
If Enabled is not displayed
Refer to Circuit/System Testing.
If Enabled is displayed
Verify DTC P1516, P2101, P2119, or P2176 is not set.
If any of the DTCs are set
Refer to Circuit/System Testing.
If none of the DTCs are set
Note: If there is a condition with the throttle body, the TAC Motor Command parameter will go to 99 % for a
predetermined amount of time and then a DTC sets. Once a DTC is set, the TAC Motor Command parameter will
go to 0 % and the TAC Motor parameter will display Disabled.
Verify the scan tool TAC Motor parameter displays Enabled while performing the Throttle Sweep Test with a
scan tool.
If Enabled is not displayed
Test or replace the Q38 Throttle Body Assembly.
If Enabled is displayed
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 data.
Verify the DTC does not set.
If the DTC sets
Refer to Circuit/System Testing.
If the DTC does not set
All OK.
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3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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Circuit/System Testing
1. Ignition OFF.
Warning: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of
the throttle blade could cause personal injury.
2. Verify the conditions listed below do not exist with the Q38 Throttle Body assembly:
Note:
The rest position is defined as the actual Throttle Position percentage when the ignition is OFF or with the
ignition ON for greater than 30 seconds.
When the ignition is OFF, spring tension should hold the throttle plate in the rest position. You should be
able to open the throttle plate to wide open throttle (WOT) or push the throttle plate to the fully closed
position. In each case, the throttle plate should return to the rest position without assistance.
A throttle blade that is not in the rest position
A throttle blade that is binding open or closed
A throttle blade that is free to move open or closed without spring pressure
If a condition is found
Test or replace the Q38 Throttle Body assembly.
If a condition is not found
Ignition OFF.
Note:
Disconnecting the throttle body harness connector may cause additional DTCs to set.
The Test Lamp must be connected to circuit before turning ignition on or incorrect diagnosis may occur.
Disconnect the harness connector at the Q38 Throttle Body assembly.
Cycle the Ignition ON and OFF and then ON again.
Verify that a test lamp illuminates between each motor control circuit listed below and ground.
TAC Motor Control Closed circuit terminal A or 3
TAC Motor Control Open circuit terminal B or 5
If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the appropriate control circuit and ground.
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance
Test for less than 2 Ω on the control circuit from end to end.
If greater than 2 Ω, repair the open or high resistance on the circuit.
If less than 2 Ω, replace the K20 Engine Control Module.
If the test lamp illuminates
Disconnect the harness connector at the K20 Engine Control Module.
Test for less than 1 V between each motor control circuit listed below and ground.
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3/20/2021 DTC P1516, P2101, P2119, or P2176 (LUW, LWE) • 2014 Chevrolet Sonic • MotoLogic
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TAC Motor Control Closed circuit terminal A or 3
TAC Motor Control Open circuit terminal B or 5
If greater than 1 V
Repair the short to voltage on the circuit.
If less than 1 V
Test or replace the Q38 Throttle Body assembly.
Repair Instructions
Throttle Body Assembly Replacement
Control Module References for Engine Control Module replacement, programming, and setup
Repair Verification
1. Ignition OFF.
2. Install any components that have been removed or replaced during diagnosis.
3. Perform any adjustments, programming or setup procedures that are required when a component is
removed or replaced.
4. Ignition ON.
5. Clear the DTCs with a scan tool.
6. Turn the ignition OFF for 60 s.
7. Ignition ON.
8. Verify the scan tool TAC Motor parameter displays Enabled while performing the Throttle Sweep Test with
a scan tool.
If Enabled is not displayed
Test or replace the Q38 Throttle Body assembly.
If Enabled is displayed
If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze
Frame/Failure Records, if applicable, in order to verify the DTC does not set.
If DTC sets
Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
If DTC does not set
All OK.
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