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Speedometer, ABS Light, Overdrive light...

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Old Sep 23, 2010 | 12:36 PM
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dfarland
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Unhappy Speedometer, ABS Light, Overdrive light...

I have a 2000 F350 with a 5.4L Diesel engine. The few days ago the speedometer started acting up. The speedometer doesn't move until you hit about 40 mph, the odometer and trip odometer don't seem to move until you hit the magic speed either. The ABS light is also on, and I do believe that came on the same time as the speedometer started it's problem. Also, the overdrive light flashes during the time 0-40 that the speedometer is not working.
 
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Old Sep 23, 2010 | 12:43 PM
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Start checking for a weak alternator / battery / contacts.

Reset all computers.
 
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Old Sep 23, 2010 | 01:03 PM
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sounds like a bad vehicle speed sensor (VSS) to me. It resides in the top of the rear diff housing i believe.
 
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Old Sep 23, 2010 | 01:36 PM
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"5.4L Diesel engine" ???

I agree it sounds like a VSS problem. Dirty, faulty, etc. Also check/change your differential fluid if the sensor is dirty/clogged with debris.
 
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Old Sep 23, 2010 | 01:57 PM
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Do you put diesel fuel in this 5.4 diesel?
 
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Old Sep 23, 2010 | 02:48 PM
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Lightbulb How about 7.3L Diesel...

I feel like a real dummy...
 
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Old Sep 23, 2010 | 03:06 PM
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If I'm not mistaken....my 1999 F350 has a speed sensor on the rear end as mentioned, but it also has one on the rear of the transmission. When I replaced the one in the rear end housing my ABS light went out. Seems like the one on the tranny is for the speedo. Could be wrong though. Can't believe both would quit at the same time. However, on the 99 (and probably on the 2000) the sensors are the same, so you could try it in either place and then switch if needed. Just my 2 cents......
 
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