GMC Yukon XL 2000–2006

▸ELECTRICAL SYSTEM1

1. Manufacturer communication2005–2006 GMC YUKON XL ・ 2018-06-04(1 earlier editions of this document folded here)

   IP to Body Harness Connector Repair for MIL and DTC P2138

   1. 1Fault

      • Loss of engine power, no acceleration
      • Warning light
      • Check engine / Service Engine Soon
      • Reduced Engine Power
      • P2138
      • The engine warning lamp comes on intermittently with a message or indicator showing Reduced Engine Power.
      • DTC P2138 (Accelerator Pedal Position (APP) Sensor 1-2 Correlation) is set as current or in history.
      ↓→

   2. 2Finding the cause

      Possible causes

      • Water may have entered the instrument panel (IP) to body harness connector, which carries the APP sensor signals to the ECM/PCM.

      Steps to confirm (in the document’s order)

      1. Verify that no aftermarket equipment is electrically connected to the APP sensor signal or low reference circuits, or to any other ECM/PCM 5V reference or low reference circuit.
      2. Locate the IP to body harness connector, which may be in or around the left hand kick panel area or inside the IP.
      3. Inspect for a water leak in the area, using a water hose if necessary to find the source.
      4. Possible water leak points include the A-pillar seals, the sunroof drain lines (if equipped) and the windshield/cowl sealing.
      5. Inspect the terminals of the IP to body harness connector for corrosion and debris.
      ↓→

   3. 3Correction

      • Instrument Panel to Body Harness Connector: repaired

      Repair

      1. If a water leak is found, repair it as necessary and verify that the repair is effective.
      2. If corrosion or debris is found on the connector terminals, repair as necessary.

      Caution

      • Aftermarket equipment can generate DTC P2138 and/or other DTCs.
   Read the sentences of the record

   From the manufacturer’s document

   • Applies to：Applies to 2018 and prior GM passenger cars and light duty trucks.
   • Condition：The engine warning lamp comes on intermittently with a message or indicator showing Reduced Engine Power.
   • Condition：DTC P2138 (Accelerator Pedal Position (APP) Sensor 1-2 Correlation) is set as current or in history.
   • Cause：Water may have entered the instrument panel (IP) to body harness connector, which carries the APP sensor signals to the ECM/PCM.
   • Caution：Aftermarket equipment can generate DTC P2138 and/or other DTCs.
   • Confirm：Verify that no aftermarket equipment is electrically connected to the APP sensor signal or low reference circuits, or to any other ECM/PCM 5V reference or low reference circuit.
   • Confirm：Locate the IP to body harness connector, which may be in or around the left hand kick panel area or inside the IP.
   • Confirm：Inspect for a water leak in the area, using a water hose if necessary to find the source.
   • Confirm：Possible water leak points include the A-pillar seals, the sunroof drain lines (if equipped) and the windshield/cowl sealing.
   • Repair：If a water leak is found, repair it as necessary and verify that the repair is effective.
   • Confirm：Inspect the terminals of the IP to body harness connector for corrosion and debris.
   • Repair：If corrosion or debris is found on the connector terminals, repair as necessary.

   Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

   Remedy

   This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power displayed and DTC P2138 set.