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Engine Derate
Group, searching for info on this old dog, it consistently sets a CEL 84 fmi 1 code and derates. The speed sensor harness end was missing. We replaced harness end and sensor without success. The speedo still does not work. Mitchell shows a "speedo adaptor" tha... Login to read more. ![]()
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Login to read this message and participate Auto Repair Pros: Join iATN to read this message and others Vehicle Owners: Find a nearby iATN member to repair your vehicle 6 Replies Received (View Replies)6 Replies Received (Hide Replies) |
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| VIN | 1GDM7H1C3Y |
| Engine | 7.2 L |
Vehicle Data
2000 GMC C7500 Topkick C7H042 7.2L
| VIN | 1GDM7H1C3Y |
| Engine | 7.2 L |

6 Replies Received
6 Replies Received