Vehicle Speed Sensor Circuit Malfunction
There's a problem detected in the vehicle speed sensor circuit.
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 speed sensor measures how fast the vehicle is moving. If this sensor or its wiring has issues, the computer won't know the vehicle speed accurately.
What the computer is actually seeing
The Engine Control Module (ECM) expects a pulse signal from the speed sensor that corresponds to vehicle speed. When the signal drops out or becomes erratic, it triggers the fault code B1442.
What a healthy reading looks like
Typically, at least 3-12 volts will be present on the signal wire when the vehicle is moving; under normal conditions, pulses should range from 0 to approximately 5 volts for each reading.
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. Decision: Is there visible damage? If yes, repair wiring or replace connector. If no, proceed to step 2.
- 22. Measure the voltage at the speed sensor connector with the vehicle at idle. Expect about 5 volts on the reference wire. Decision: Is voltage present? If no, check power and grounds to the sensor. If yes, proceed to step 3.
- 33. With the scan tool, monitor the vehicle speed parameter while driving. Decision: Does the speed update appropriately? If no, replace the speed sensor. If yes, further diagnose the ECM.
Common causes
- Damaged wiring or connectors in the speed sensor circuit
- Faulty vehicle speed sensor
- Bad ECM software or configuration issue
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but take caution as you may experience erratic speedometer readings or cruise control issues. Fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why might this code be related to other codes?
Many sensors share circuits or depend on the same signal inputs, so problems can manifest as multiple codes.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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