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Hi....
if your car get a VSS code the Transmission control module.
Will command the Trans, in LIMP MODE.
Is mean you only will have 2 gear.
If you replaced the VSS sensor allready.
Maybe you have A electrical problem.
The First step is Check the condition of the VSS connector.
Remove the Connector and pull the wires a little each by each one.
To see if is broken inside of the Plastic cover.
IF you can
GIVE ME the Code number I will help you better.
Because is there more that One speed sensor on your trans..
Check the grounds on the Intake manifold, Black wire one of the wires is for the speed sensor.
The RED/YELLOW wire coming from the INSTRUMENT CLUSTER,
Is mean you need to check the Fuses that work with the instrument cluster. FUSE # 12 10amp, And # 30 10amp.
Located at fuse block left side of dash.
Is there a ground that work with the Cluster and Combination Meter. Behind left side of dash Black wire.
Check the Connection of the Cluster.
OK.. I hope this help on your problem.
Thank you for use fixya.
Checking the fluid level in your transmission has no effect on solving your problem. There are shift solenoids inside the transmission that can cause your problem or the transmission control module may be the problem. Use a code reader to conduct a diagnostic test to pinpoint your problem. Some auto parts stores will do it for free if you buy the replacement parts from them.
Hi I'm Peter your code P0720 Output Speed Sensor Circuit Malfunction
This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model.
On electronically controlled transmissions, the Output Shaft Speed Sensor (OSS) is located on the end of the transmission before the drive axles or driveshaft to read the speed of the output shaft which may be used to determine shift scheduling, torque converter engagement schedule and Electronic Pressure Control (EPC) inside the transmission. The Powertrain control module / Engine control module (PCM/ECM) has determined there is a malfunction with the OSS sensor. The PCM/ECM may substitute values based on other sensors to determine shift timing, torque converter operation and EPC pressure if the OSS sensor information is unavailable. The OSS sensor is also commonly used for the speedometer.
Note: On some vehicles, the OSS sensor is inline with the Transmission Fluid Temperature (TFT) sensor, if there is a failure with the TFT sensor or associated wiring, the OSS sensor may malfunction as well. If there is another code associated with the TFT sensor as well as the OSS sensor, suspect a possible problem with either sensor, or the wiring in between
First off do not listen to Autozone, they are very quick to spend your money, they are screen readers not trained automotive technicians. No fault code with few exceptions tells you exactly what is wrong, it can be the sensor, the wiring to it or the control module (computer) that has the problem. The pressure sensor is inside the transmission a really dirty big job to access, so have a TRAINED technician look into this before any parts are replaced.
Check your ignition timing!
misfiring causes an advance opening and closing of the exhaust valve and overheating.
have a mechanic to check on that w/ proper tools and module.
taah!
Where is the modulator valve on nissan sentra
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