Vehicle Speed Sensor Voltage High
Indicates the voltage from the vehicle speed sensor is too high.
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 sends a voltage signal to the engine control module (ECM) to tell it how fast the vehicle is moving. If the voltage goes too high, the ECM thinks there's a problem.
What the computer is actually seeing
The ECM reads a voltage from the vehicle speed sensor that exceeds the normal operating range, which is typically 0.5 to 4.5 volts. Anything above this range triggers the SPN 1958 code.
What a healthy reading looks like
Normal operating voltage is between 0.5V and 4.5V; anything above 4.5V will trigger this fault.
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. Check the vehicle speed sensor wiring for damage or corrosion. If found, repair or replace as needed. Decision: Is wiring intact? Yes: Proceed to Step 2. No: Repair wiring and retest.
- 22. Using a multimeter, measure the voltage at the vehicle speed sensor connector with the ignition on (engine off). Voltage should be between 0.5V and 4.5V. Decision: Is voltage within range? Yes: Proceed to Step 3. No: Replace the sensor and retest.
- 33. If the sensor voltage is okay, inspect the ECM for fault codes and software updates. If there are updates or faults, consider reprogramming or replacing the ECM. Decision: Is the ECM functioning correctly? Yes: Problem resolved. No: Replace ECM and retest.
Common causes
- Faulty vehicle speed sensor
- Shorted wiring or connectors
- Corroded connectors
- Faulty ECM or software issue
Typical repair cost
$$$ (200-600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is drivable but fix it soon to ensure accuracy of speed readings and avoid potential transmission issues.
Will this error return after clearing it?
If the underlying issue isn't fixed, yes, the code will likely come back.
Why does it appear alongside SPN 1959?
Both codes relate to vehicle speed issues; SPN 1959 may indicate a different problem with the same sensor system.
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