Redundant Speed Sensor Signal - Current
There is a fault with the redundant speed sensor signal in the system.
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 computer is monitoring two speed sensors for the vehicle's wheels or transmission, and it's seeing a problem with one of them. This could be due to wiring issues or a sensor failure, leading to incorrect speed readings.
What the computer is actually seeing
The powertrain control module (PCM) expects a consistent input from the redundant speed sensor within a specific voltage range (typically 0.5V to 4.5V). When the signal falls outside of this range or is absent altogether, the code gets triggered.
What a healthy reading looks like
Expect voltage signals between 0.5V (stopped) and 4.5V (maximum speed).
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 wiring and connectors leading to the speed sensor. Look for any signs of damage, corrosion, or loose connections. Are they in good condition?
- 22. Check the voltage output from the redundant speed sensor using a multimeter. Is it between 0.5V and 4.5V?
- 33. If the voltage is out of range, swap the speed sensor with a known good one. Does the replacement sensor produce the expected voltage?
- 44. If the voltage is still incorrect with the new sensor, check for continuity and proper grounding in the wiring harness. Is the wiring intact and grounded properly?
- 55. If all wiring checks out and the replacement sensor works fine, the problem could be in the PCM. Are there any other codes?
Common causes
- Faulty speed sensor
- Damaged wiring or connectors
- Poor ground connection for the sensor
- Corroded terminals on the sensor or connector
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but it's recommended to fix it soon as it could affect performance and reliability.
Will this code come back after clearing it?
If the issue isn't resolved, the code will likely reappear after driving the vehicle.
Why does this code pair with SPN 3371?
SPN 3371 and SPN 3372 are related as they both deal with redundant speed sensor signals; if one fails, the other is typically affected.
Working a real vehicle right now?
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