When your speedometer reading does not match the speed indicated by your GPS, the discrepancy is more than an inconvenience; it is a safety hazard. A tire with a low pressure level has a smaller effective circumference, causing the speedometer to overread.
Speedometer Reading Wrong Fix Guide
Tire Size Comparison Table Tire Diameter Speedometer Error Stock Size 0% (Accurate) Oversized by 3% Underreads by ~3% Undersized by 3% Overreads by ~3% Scanning for Diagnostic Trouble Codes If the tires are correct but the speed remains wrong, connect an OBD-II scanner to retrieve stored diagnostic trouble codes. Software Recalibration and Reset.
Removing the cluster and examining the PCB for visible damage is necessary. The diameter of the tire directly impacts the gear ratio calculation; if you recently installed larger or smaller tires, the speedometer will inevitably be off.
Speedometer Reading Wrong Fix Guide
To test it, locate the sensor on the transmission and disconnect the electrical connector. A functioning sensor will generate a fluctuating AC voltage signal.
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