P0721 Diagnostic Trouble Code Discussion for August 2010
Output Shaft Speed Sensor Circuit Malfunction
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| Help Request | Posted | |
| 2003 GMC Sierra 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23123 P0721: Output Speed Sensor Performance. Greeting fellow techs. This truck has had this problem for almost 1 year now. It is very intermittent- have never had it happen on test drives etc. At first the vss in the transfer case was replaced and the transfer case was rebuilt. Problem still came back. W... |
August 27, 2010 |
