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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 30 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0218-P0731)) >> DTC P0218 >> Test Description

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. 3:  This step inspects for air restriction and loss of transmission fluid flow, causing an extremely high TFT.
DTC P0218

Step Action Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install the scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. The Clear Info function will erase the data.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Checking Procedure .
Is the transmission fluid level correct?		 Go to Step 3  Go to Transmission Fluid Checking Procedure
3
  1. Inspect the engine cooling system for the following conditions:
    • Air flow restrictions
    • Air flow blockage
    • System fluid level and condition
    • Debris
  2. Inspect the transmission cooling system for the following conditions:
    • Air flow restrictions
    • Air flow blockage
    • System fluid level and conditions
    • Debris
    • Damaged cooler lines or hoses
Did you find and correct the condition?		 Go to Step 6  Go to Step 4 
4 Perform the Line Pressure Check Procedure.
Refer to Line Pressure Check Procedure .
Is the line pressure correct?		 Go to Step 6  Go to Step 5 
5 Inspect the torque converter stator for damage.
Refer to Torque Converter Diagnosis Procedure .
Did you find and correct the condition?		 Go to Step 6  Go to Symptoms - Automatic Transmission
6 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Using the scan tool, monitor the TFT.
  3. Start the engine.
  4. The TFT must be less than 122°C (252°F) for at least 10 seconds.
  5. Select Specific DTC.
  6. Enter DTC P0218.

Has the test run and passed?		 Go to Step 7  Go to Step 2 
7 With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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