Vehicle Speed Signal Malfunction
There’s a problem with the vehicle speed signal the computer is receiving.
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 computer relies on speed sensors to know how fast the vehicle is going. If the sensor or wiring fails, it can’t give accurate speed data, which can affect various systems like ABS or traction control.
What the computer is actually seeing
The computer expects a consistent speed signal ranging from 0 to 60+ mph while the vehicle is in motion. If it detects erratic readings or none at all, it triggers the C1445 code.
What a healthy reading looks like
Typical vehicle speed sensor output should be between 0.5V to 4.8V depending on the speed. At a steady speed of 30 mph, it should output around 2.5V.
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.
- 11. Inspect the speed sensor wiring and connector for damage or corrosion. Secure connections and repair as needed.
- 22. Check the output voltage of the speed sensor with a multimeter. At zero speed, it should read between 0-0.5V and increase with speed, ideally reaching around 2.5V at 30 mph.
- 33. If the voltage is erratic or outside the expected range, replace the speed sensor. If it's within range, go to step 4.
- 44. Scan for additional codes related to ABS or other systems. If codes exist, address them; if not, check the vehicle’s ECM/PCM for updates or faults.
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connector to the speed sensor
- Faulty ECM/PCM (rare)
- Wheel speed sensor faults affecting ABS (if equipped)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but features like ABS and traction control may not work, which can reduce safety in slippery conditions.
Will the code come back after resetting?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code show up with others?
It often pairs with ABS codes because both systems rely on vehicle speed data, and if that data is compromised, it can trigger multiple faults.
Working a real vehicle right now?
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