Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Conditions for Clearing the DTC
2006 Buick Allure CXSSECTION Conditions for Clearing the DTC
WARNING: This page is about a different variant/trim than selected.
- 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 non-emission related diagnostic.
- Clear the DTC with a scan tool.
DTC P2120
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views and Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
0.24-2 V | Go to Step 4 | Go to Step 3 |
| 3 |
|
4.6-5.2 V | Go to Step 6 | Go to Step 9 |
| 4 | Is DTC P2138 also set? | - | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 5 |
| 5 |
|
- | Go to Step 6 | Go to Testing for Intermittent Conditions and Poor Connections |
| 6 |
|
0 V | Go to Step 7 | Go to Step 11 |
| 7 |
|
4.6-5.2 V | Go to Step 13 | Go to Step 8 |
| 8 |
|
4.6-5.2 V | Go to Step 10 | Go to Step 9 |
| 9 | Does the DMM indicate voltage less than the specified value on the APP sensor 1 5-volt reference circuit? | 5 V | Go to Step 14 | Go to Step 16 |
| 10 | Test the APP sensor 1 signal circuit for an open or for high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 12 |
| 11 | Test the APP sensor 1 signal circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 19 |
| 12 | Test the APP sensor 1 signal circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 19 |
| 13 | Test the APP sensor 1 low reference circuit for an open or for high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 17 |
| 14 | Test the APP sensor 1 5-volt reference circuit for an open or for high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 15 |
| 15 | Test the APP sensor 1 5-volt reference circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 19 |
| 16 | Test the APP sensor 1 5-volt reference circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 19 |
| 17 | Is DTC U0107 also set? | - | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 18 |
| 18 | Test for an intermittent and for a poor connection at the accelerator pedal harness connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 20 |
| 19 | Test for an intermittent and for a poor connection at the throttle body harness connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 21 |
| 20 | Replace the accelerator pedal assembly. Refer to Accelerator Pedal with Position Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 22 | - |
| 21 | Replace the throttle body. Refer to Throttle Body Assembly Replacement
. Did you complete the replacement? |
- | Go to Step 22 | - |
| 22 |
|
- | Go to Step 2 | Go to Step 23 |
| 23 |
IMPORTANT:
Be aware that repairing one individual condition may correct more than one DTC. 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 | System OK |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.