Vehicle Speed Sensor Out of Self-Test Range (Ford)
What does P1501 mean?
The P1501 code means the vehicle's onboard diagnostic system has detected: Vehicle Speed Sensor Out of Self-Test Range (Ford). This is a low severity code.
Common Symptoms
- Check Engine Light illuminated during self-test only
- Vehicle speed reading present when it should be zero
- No drivability symptoms during normal driving
- Self-test failure code stored
- Speedometer may read slightly off
Probable Causes (Ranked by Likelihood)
- Vehicle was moving during PCM self-test Very High
- Faulty vehicle speed sensor producing a false signal High
- Electromagnetic interference in the speed sensor circuit Moderate
- Incorrect self-test procedure performed Moderate
- PCM internal fault Low
Step-by-Step Diagnostic Procedure
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Ensure the vehicle is completely stopped with the wheels not turning before running the PCM self-test.
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Clear the code, perform the self-test again with the vehicle properly stationary, and check if the code returns.
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If the code persists, check the vehicle speed sensor output at a standstill. It should read 0 MPH.
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Inspect the speed sensor wiring for interference from nearby high-current wires.
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Test the speed sensor for a clean zero-signal output when the vehicle is stationary.
Frequently Asked Questions
Did I just need to be parked during the test?
Most likely yes. The PCM self-test expects a zero speed signal. If the vehicle was rolling, on a lift with wheels spinning, or moving in any way, P1501 will be set.
Is P1501 a real problem?
Usually not. It is most often a test procedure error. If the code sets repeatedly with the vehicle properly parked, then the speed sensor may be producing a false signal and should be investigated.
Can wheel speed sensors cause this code?
On vehicles that use ABS wheel speed sensors for the vehicle speed signal, a faulty wheel speed sensor could produce a ghost signal. Check the ABS system for related codes.