GM Service Manual Online
For 1990-2009 cars only

Description

This DTC compares the TP sensor 1 input with the TP sensor 2 input. There are two TP sensors located on the throttle body inside of the throttle actuator control (TAC) module. The TP sensors are used to determine the throttle plate angle. The TAC module expects the output of the two TP sensors to follow the same linear path. If the two sensors report conflicting information to the TAC module a DTC P2135 can set. The TP sensor is an integral part of the TAC module is not serviced separately. Installing a new TP sensor requires the replacement of the throttle body assembly. For additional information on the operation of the TP sensor and the TAC system refer to Throttle Actuator Control (TAC) System Description .

DTC Descriptor

This diagnostic procedure supports the following DTC.

DTC P2135 Throttle Position (TP) Sensor 1/2 Correlation

Conditions for Running the DTC

    • DTCs P0122, P0123, P0222, P0223, P0641, P0651, P2100, P2101, P2108, P2122, P2123, P2127, P2128, P2138, P2176, or U0107 are not set.
    • The ignition is ON.
    • The Idle Learn Procedure has been performed ensuring that the minimum TP value is stored in the PCM memory.
    • DTC P2135 runs continuously once the above conditions are met.

Conditions for Setting the DTC

    • The throttle angle between TP sensor 1 and TP sensor 2 is 5 percent or more.
    • The above condition is present for at least 135 milliseconds.

Action Taken When the DTC Sets

    • The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Conditions for Clearing the MIL/DTC

    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • 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 emission related diagnostic.
    • Clear the MIL and the DTC with a scan tool.

Test Description

The numbers below refer to the step numbers in the diagnostic table.

  1. The Diagnostic System Check-Engine Controls prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

  2. This step determines if a fault is present.

Step

Action

Value(s)

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check-Engine Controls?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

  1. Turn ON the ignition, leaving the engine OFF.
  2. Use the scan tool in order to clear the DTCs.
  3. Leave the ignition ON for 30 seconds.

Did DTC P2135 set?

--

Go to Step 4

Go to Step 3

3

  1. Perform the idle learn procedure. Refer to Idle Learn .
  2. Check for DTCs.

Did DTC P2135 set?

--

Go to Step 4

Go to Intermittent Conditions

4

  1. The relationship between the TP sensors is faulty. Replace the TAC module. Refer to Throttle Body Assembly Replacement .
  2. Perform the idle learn procedure. Refer to Idle Learn .

Did you complete the replacement?

--

Go to Step 5

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5

  1. Use the scan tool in order to clear the DTCs.
  2. Start the engine.
  3. Operate the vehicle within the Freeze Frame conditions as specified or until the DTC P2135 diagnostic test has run. Refer to the Test Description.

Does the DTC run and pass?

--

Go to Step 6

Go to Step 2

6

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK