Cruise Control System - Vehicle Speed Input Circuit Range/Performance Problem
Issues with the cruise control speed input signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The vehicle's cruise control isn't reading the speed correctly, making it unreliable for maintaining speed.
What the computer is actually seeing
The engine control module (ECM) expects a consistent vehicle speed signal from the speed sensor. If the signal fluctuates outside a predetermined range or goes missing, it triggers this code.
What a healthy reading looks like
The vehicle speed signal should provide a voltage between 0.5V (0 mph) and 5V (maximum speed), updating at least once every 100 milliseconds.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check all related wiring and connectors for damage or corrosion.
- 2Inspect the vehicle speed sensor for proper mounting and connection.
- 3Using a multimeter, check the voltage output from the vehicle speed sensor at idle; it should rise with vehicle speed and fall to 0 when stopped. If no signal or erratic readings, replace the VSS.
- 4Clear the code and test drive to see if it returns; if it does, inspect the ECM and surrounding wiring.
Common causes
- Faulty vehicle speed sensor (VSS)
- Wiring or connector issues in speed sensor circuit
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Yes, but cruise control may not function reliably; use caution if relying on this feature.
Will the code come back after clearing?
Yes, if the underlying issue isn't resolved, the code will likely return.
Why does this code pair with P0500?
P0500 indicates a general vehicle speed sensor issue; they often occur together since both relate to the speed input of the cruise control system.
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