P0500 on 1993-1997 Volvo 850 — Vehicle Speed Sensor Malfunction
1 vehicles · 1 makes · $50-$300 repair
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Volvo 850 · 1993–1997
The instrument cluster on the Volvo 850 is prone to intermittent speedometer and odometer failure caused by deteriorating solder joints on the circuit board, particularly on the vehicle speed signal circuit. The speedometer may bounce, read incorrectly, or drop to zero while driving. Since the ECU uses vehicle speed data for shift points and idle control, this can also cause rough shifting and erratic idle.
Common Symptoms
- Speedometer drops to zero intermittently
- Speedometer needle bounces
- Odometer stops counting
- Cruise control will not engage
- Transmission shifts erratically
How to Fix
Remove the instrument cluster and resolder the cold solder joints on the back of the circuit board, paying attention to the speed sensor signal pins. This is a common DIY fix. Alternatively, send the cluster to a specialist for professional resoldering ($100-$200). If the cluster is beyond repair, source a used unit and have the odometer mileage corrected by a dealer.
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Sources for this issue (1)
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P0500 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0500 mean?
P0500 stands for "Vehicle Speed Sensor Malfunction." This code indicates the vehicle speed sensor (VSS) signal is missing, erratic, or out of range. The speed sensor reports how fast the vehicle is moving, and the computer uses that input for the speedometer, transmission shift timing, cruise control, ABS coordination, and other functions. When the expected speed signal isn't present or doesn't match other data, P0500 sets. Symptoms can include an inoperative or erratic speedometer, harsh or delayed shifts, and cruise control that won't engage.
What are the most common causes of P0500?
The most common causes of P0500 are: Failed vehicle speed sensor, Corroded or loose speed sensor connector, Damaged, open, or shorted sensor wiring, Damaged sensor tone/reluctor ring, Faulty ABS wheel speed sensor (on systems that derive speed from ABS), Poor sensor power or ground, Blown fuse in the sensor circuit, Faulty PCM/ECM or instrument cluster (rare). The specific cause varies by vehicle.
How much does it cost to fix P0500?
Repair costs for P0500 range from $50 to $300, depending on the vehicle and root cause.
Which vehicles are affected by P0500?
Au7o has documented P0500 across 1 vehicle models from 1 manufacturers: Volvo.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.