Wheel Speed Sensor Input Circuit Malfunction
This code indicates a problem with the wheel 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 wheel speed sensor detects how fast each wheel is turning. If there's a problem in the sensor or its wiring, it can't send accurate speed data to the computer, which can cause issues with traction control and ABS.
What the computer is actually seeing
The ABS module monitors the voltage signal from the wheel speed sensors. A drop below 0.5V or a signal that doesn't change when the vehicle moves indicates a fault.
What a healthy reading looks like
Expected voltage from the wheel speed sensor is between 0.5V and 2.5V while driving, with a signal that fluctuates as wheel speed changes.
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. Visually inspect the wheel speed sensor and wiring for damage, corrosion, or loose connections. Decision: If damaged, repair/replace as necessary.
- 22. Test the wheel speed sensor output with a multimeter. Expected voltage should be between 0.5V and 2.5V. Decision: If voltage is outside this range, replace the sensor.
- 33. Check for any ABS module fault codes using a scan tool to eliminate other possible issues. Decision: If other codes are related, address those first before moving back to the sensor.
Common causes
- Corroded connectors
- Damaged wiring
- Faulty wheel speed sensor
- ABS module failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Driving with a C1248 can be risky because the ABS and traction control might not work properly, increasing the chance of slipping or losing control.
Will this code come back after I clear it?
If the underlying issue is not fixed—like a bad sensor or wiring—the code is likely to reappear.
Why does this code pair with other speed sensor codes?
These codes often appear together because they indicate a common issue within the wheel speed sensing system, such as wiring or sensor faults.
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