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Home >> Cadillac >> 2006 >> Escalade AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 785 (Engine Control System - 8.1L - DTC P0506 To DTC U0107) >> DTC P2138 >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  Any circuit faults on either APP sensor 1 or 2 will set one of the DTCs listed. Refer to the appropriate table for diagnosis.
DTC P2138

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or 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  Observe the DTC information with a scan tool.
Is DTC P0120, P0220, P0641, P0651, P2120, or P2125 also set?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the accelerator pedal position (APP) sensor electrical connector.
  3. Disconnect the powertrain control module (PCM).
  4. Use a DMM to measure the resistance of the following circuits for each of the APP sensors:
    • The low reference circuit
    • The signal circuit
    • The 5-volt reference circuit
Did any of the circuits measure more than the specified value?		 5 ohm Go to Step 5  Go to Step 4 
4
  1. Test for a short between any of the circuits in the APP sensor harness.
  2. Repair the circuit as necessary. Refer to Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
5 Repair the high resistance in the circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 7  -
6 Replace the APP sensor. Refer to Accelerator Pedal with Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 7  -
7
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 8 
8 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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