P2135
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provide an overview of each diagnostic category.
DTC Descriptors
DTC P0120
- Throttle Position (TP) Sensor 1 Circuit
DTC P0122
- Throttle Position (TP) Sensor 1 Circuit Low Voltage
DTC P0123
- Throttle Position (TP) Sensor 1 Circuit High Voltage
DTC P0220
- Throttle Position (TP) Sensor 2 Circuit
DTC P0222
- Throttle Position (TP) Sensor 2 Circuit Low Voltage
DTC P0223
- Throttle Position (TP) Sensor 2 Circuit High Voltage
DTC P2135
- Throttle Position (TP) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit , a common low reference circuit, and two independent signal circuits.
Conditions for Running the DTC
P0120, P0122, P0123, P0220, P0222, or P0223
* DTCs P0601, P0602, P0603, P0604, P0606, P060D, P062F, P0641, P0651 are not set.
* The system voltage is greater than 5.23 V.
* The ignition is in the Unlock/Accessory or Run position.
* The DTCs run continuously when the above conditions are met.
P2135
* DTCs P0120, P0122, P0123, P0220, P0222, P0223, P0641, or P0651 are not set.
* The system voltage is greater than 5.23 V.
* The ignition is in the Unlock/Accessory or Run position.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0120
TP sensor 1 voltage is less than 0.35 V or greater than 4.58 V for greater than 1 s.
P0122
The ECM detects that the TP sensor 1 voltage is less than 0.35 V for greater than 1 s.
P0123
The ECM detects that the TP sensor 1 voltage is greater than 4.58 V for greater than 1 s.
P0220
The TP sensor 2 voltage is less than 0.35 V or greater than 4.7 V for greater than 1 s.
P0222
The ECM detects that the TP sensor 2 voltage is less than 0.35 V for greater than 1 s.
P0223
The ECM detects that the TP sensor 2 voltage is greater than 4.59 V for greater than 1 s.
P2135
The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for greater than 1 s.
Action Taken When the DTC Sets
* DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
* The ECM 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 ECM commands the engine OFF.
Conditions for Clearing the MIL/DTC
DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
Diagnostic Aids
A high resistance condition on the throttle position or throttle actuator control circuits could cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation Reference
Throttle Actuator Control (TAC) System Description (Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641 or P0651 are not set.
• If a DTC is set, refer to DTC P0641 or P0651 (P0641) for further diagnosis.
2. Observe the scan tool TP sensor 1 voltage parameter. The reading should be between 4.75-0.33 V, and change with the accelerator pedal input.
3. Observe the scan tool TP sensor 2 voltage parameter. The reading should be between 0.25-4.59 V, and change with accelerator pedal input.
4. Observe the scan tool TP sensor 1 and 2 parameter. The scan tool should indicate Agree.
5. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
6. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0120 or P0220 are not the only TP sensor DTCs set.
• If DTC P0120 or P0220 are the only DTCs set, replace the ECM.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the throttle body.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal C and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminals E and ground.
• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Test for less than 0.1 V between the TP sensor 1 signal circuit terminal D and ground.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5-volt reference circuit terminal E. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.8 V.
• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the throttle body.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Throttle Body Assembly Replacement (Removal and Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming