LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

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Old Mar 1, 2004 | 07:55 PM
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SLeeper94Z's Avatar
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scanned codes

51 Ecm Prom Error
72 Trans output speed sensor
does anyone know what i can do about these codes what there associated with espically the trans output sensor?
Old Mar 1, 2004 | 08:55 PM
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51 may be just a hiccup.

72 is Vehicle Speed Sensor loss (automatic transmission only). Check the connection first.

You may want to reset the PCM and see if either returns.
Old Mar 1, 2004 | 09:26 PM
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72

would you think trans output speed sensor could make me not shift into 3rd gear like the car is slipping ? is this sensor replaceable , what you happen to have the part #.. thanks

Last edited by SLeeper94Z; Mar 1, 2004 at 09:44 PM.
Old Mar 1, 2004 | 10:51 PM
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72 is going to affect shifting. The PCM relies on the VSS for making shifts.

GM PART # 8673299 for 94-95 VSS
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