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Old 12-08-2022, 08:40 PM   #1
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Odometer miles changed

O5 tiffin allegro bus. Odometer mysteriously started reading total mileage different from last recorded miles. Not sure how to switch from miles to kilometers and back, if possible. Lost about 50k miles
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Old 12-08-2022, 08:53 PM   #2
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Old 12-09-2022, 12:15 AM   #3
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Usually there is a toggle on the dash, often called a DIC, Dash Information Center. You should be able to toggle to a screen that allows you to change the settings.
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Old 12-09-2022, 01:22 AM   #4
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I believe you may have the Medallion Instrumentation System on your 2005 Bus. If so you might try the following:

1. From the home screen press T to Toggle to the SETUP screen.
2. Highlight the UNITS ENG and press E. The highlight bar will flash.
3. Press either the UP or DOWN arrow to change to MET for Metric or ENG for English units.
4. Press E to activate changes and stop the highlight bar from flashing.
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Old 12-09-2022, 07:34 AM   #5
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Congratulations! You seem to have one of two known problems with the Freightliner MMDC.

1. Some reset to zero every 50K miles. If you lost *exactly* 50K this is your problem. They will never show more than 50K miles.

2. If you have a low (not zero) voltage event, such as trying to start the engine on weak batteries or with a bad starter, the MMDC might decide to divide the odometer display's mileage by 2, and then start incrementing normally from there.

We had #2. At 104,442 miles, our odometer changed to read 52,221 miles. We met another couple in Tuscumbia (near Red Bay) that seemed to have had #1.

There is no way to reconcile the odometer reading with the ECM mileage. FL says there is no fix.

The actual mileage from the Cummins ECM can be retrieved from the MMDC by getting into Diagnostic Mode. You need a password do that. It's 8127 for all MMDCs:

1. Turn the key to the On position

2. Start the engine if the air pressure alarm is sounding and wait for it to go off.

3. Then, using the information center buttons:
- Press Home ("H")
- Using the arrows, highlight "Service" and press Enter ("E")
- Highlight "Diagnostics" and press Enter
- Enter "8127" a digit at a time with the arrow and Enter keys
- Scroll to display "ECU VS IP ODO DIFF"
- Top number is the ECU mileage--the actual mileage recorded for the engine
- Bottom number is the dash odometer mileage

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2006 Tiffin Allegro Bus 40QDP
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