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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 Engine 🢒 Engine Controls - 6.5L (L65) 🢒 DTC P0220 Accelerator Pedal Position (APP) Sensor 2 Circuit

Object Number: 550686 Size: MF
Engine Controls Components
Cruise Control, APP Module
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The accelerator pedal position (APP) module provides a voltage signal that changes relative to the accelerator pedal position. There are 3 sensors located within the APP module that are scaled differently.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The reference voltage on APP 2 is less than 4.8 volts.
    • The condition is met for 2 seconds.

Action Taken When the DTC Sets
    •  The service throttle soon lamp will not illuminate when one APP DTC sets. The PCM will only illuminate the service throttle soon lamp when multiple APP DTCs set.
    • The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Failure Records.

Conditions for Clearing the MIL/DTC
    • A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission-related diagnostic does not report any failures.
    • Use a scan tool in order to clear the DTCs.

Diagnostic Aids

There are no driveability issues associated with the APP module unless a DTC is present. The most likely causes of this DTC are faulty connections or the sensor itself. The least likely cause is a PCM problem.

All 5-volt reference circuits must be checked for a proper reference voltage. Voltmeter accuracy is important.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

  1. This step will determine if there is a good voltage reference.

Step

Action

Value(s)

Yes

No

1

Important: Before clearing any DTCs, use the scan tool Capture Info function to save the Freeze Frame and the Failure records for reference. The control module's data is deleted once the Clear Info function is used.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Disconnect the APP sensor electrical connector.
  2. Turn ON the ignition, with the engine OFF.
  3. With J 39200 DMM connected to ground, check all of the APP 5-volt reference circuits at the APP harness.

Is the voltage less than the specified value?

4.8 V

Go to Step 4

Go to Step 3

3

The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If any additional DTCs were stored, refer to those tables first.

Are additional DTCs stored?

--

Go to the applicable DTC table

Go to Diagnostic Aids

4
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Check the 5-volt reference circuit for a short to ground.
  4. If the 5-volt reference circuit is shorted to ground, repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems.

Was the 5-volt reference circuit shorted to ground?

--

Go to Step 6

Go to Step 5

5

Important: The new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Is the action complete?

--

Go to Step 6

--

6
  1. Use a scan tool in order to clear the DTCs.
  2. Start the engine.
  3. Allow the engine to idle until the normal operating temperature is reached.
  4. Select DTC and the Specific DTC function.
  5. Enter the DTC number that was set.
  6. Operate the vehicle within the Conditions for Setting this DTC until the scan tool indicates the diagnostic Ran.

Does the scan tool indicate the diagnostic Passed?

--

Go to Step 7

Go to Step 2

7

Does the scan tool display any additional undiagnosed DTCs?

--

Go to the applicable DTC table

System OK