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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (ENGINE CONTROL SYSTEM - 8.1L - DTC P0506 TO DTC U0107)DTC P2138TEST DESCRIPTION
2006 Chevrolet Suburban C1500, 5.3 Z

Test Description

2006 Chevrolet Suburban C1500, 5.3 ZSECTION Test Description
WARNING: This page is about a different variant/trim than selected.

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
RENDER: 1.0x

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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.