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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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. 5:  Locating and repairing an individual condition may correct more than one DTC.
DTC P0068

Step Action 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 - Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Is DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P1111, or P1112 set? Go to Diagnostic Trouble Code (DTC) List Go to Step 3 
3
IMPORTANT: If any of the conditions listed below exist, replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .
Inspect the throttle body for the following:
  • Loose or damaged throttle blade
  • Cracked or bent throttle shaft
Did you find and correct the condition?		 Go to Step 4  Go to Diagnostic Aids
4
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 Go to Step 5  Go to Step 2 
5  With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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