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Old 04-18-2014, 01:56 PM   #1
fi3ndx
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Speedometer randomly shuts off while driving.

My speedometer while driving will sometimes randomly shut off and stay at zero. All other gauges work just fine. Sometimes it only takes a few seconds to come back on other times it will take minutes. It will also jump back and forth for a little while before staying on sometimes. It only seems to happen once after having not driven for a few hours. Not sure if its related but my directional doesn't automatically shut off when you turn the wheel. The problem seemed to happen soon after I installed an aftermarket radio. I think its coincidence because i shut the radio completely off and it still happens but if there are any connections that could cause this Id like to know show I can correct them.


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Old 04-18-2014, 02:24 PM   #2
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Directional cancelling is mechanical, so that isn't involved.

IIRC at least some of the stock radios had speed sensitive volume, so there is a possibility that the new radio installation is a factor.

Were wires clipped to attach a new radio harness? Might be an unused one shorting out on occasion if that is the case.

VSS (Vehicle speed sensor) is another possibility. Crud (metallic) on the sensor can cause intermittent faults & there's always the connector/wiring possibility.

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Old 04-21-2014, 07:57 AM   #3
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The wires were crimped Im going to drive without the radio installed and see if the problem still occurs. If it is the VSS how involved is it to install a new one.
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Old 04-21-2014, 09:49 AM   #4
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The VSS signal comes from the PCM. Leaving it disconnected from the radio will cause no harm, but if the wire is left dangling and it is shorting out, then that would be a problem.
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Old 04-21-2014, 11:54 AM   #5
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^^^ radio connections seem the best place to start, since this happened after the radio installation.

VSS itself is on the transmission, signal goes to PCM then speedo/radio IIRC.
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Old 04-21-2014, 12:31 PM   #6
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A quick and easy way to check the VSS if the concern is still present with the radio removed is to connect a scan tool and read the PIDs. You might be able to convince an auto parts store to let you do this around the block. You can actually see the VSS input PID. If it is bouncing around, then you have a problem with the sensor or wiring from the sensor to the PCM.

BTW the Speedometer on these cars will default to 0 mph when there is no VSS input. The VSS is a direct input to the PCM and then the PCM broadcasts this over the SCP network to the Instrument Cluster.
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