U1120
means the PCM doesn't receive a vehicle speed signal from the Anti-lock
brake Module over the CAN C bus. This can be caused by the ABS module,
PCM or something wrong with the can bus. This might be just an erroneous
code and may never set again
Code P0501 Vehicle Speed Sensor Range/Performance
What does that mean?
Basically this means that the vehicle's speed as read by the Vehicle
Speed Sensor (VSS) is not working properly.
Potential Symptoms
This code is different from the P0500 code in the fact
that it may not trigger the malfunction indicator light (MIL). Potential symptoms
are basically the same as the P0500 VSS code:
- loss of anti-lock brakes
- the "anti-lock" or "brake" warning lamps on the dash
may be lit
- the speedometer or odometer may not work properly (or at all)
- your vehicle's RPM limiter may be decreased
- the shifting of an automatic transmission may become erratic
- other symptoms may also be present
Causes
A P0501 DTC trouble code may be caused by one or more of the following:
- The Vehicle Speed Sensor (VSS) is not reading (functioning) properly
- There is a broken/frayed wire leading to the vehicle speed sensor
- The vehicle's PCM is not correctly configured for the actual tire size on
the vehicle
Possible Solutions
The simplest thing to do is to reset the code and see if it comes back.
Next, check all wiring and connectors that lead to the speed sensor. The location
of the sensor depends on your vehicle. The sensor could be on the rear axle,
transmission, or perhaps the wheel hub (brake) assembly.
If the wiring and connectors are OK, then check the voltage at the speed sensor.
Again, the exact procedure will depend on your make and model of vehicle.
If everything looks OK, replace the sensor.
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