B0491 Infiniti Auto Trouble Code
B0491 Infiniti OBD2 reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.
Remove the air filter box assembly so you can access the transmission range switch. Turn the key to the ON position, but do not start the vehicle. Move the shifter to the neutral position. Align the alignment holes between the switch and the shift lever. Insert a 5mm drill bit into the adjustment hole to verify the proper alignment for the neutral position.
B0491 Infiniti Possible Solution:
Vehicle Speed Sensor (VSS) Out of Self Test Range Indicates the VSS input signal is out of Self Test range. If the PCM detects a VSS input signal any time during Self Test, a DTC P1501 will be set and the test will abort. Noisy VSS input signal from Radio Frequency Interference/ Electro-Magnetic Interference (RFI/EMI) external sources such as ignition wires, charging circuit or after market equipment. Check for VSS input to be 0 mph when vehicle transmission is in Park.
B0491 Infiniti Description For All Models :
- Infiniti Ex35
- Infiniti Fx30
- Infiniti Fx35
- Infiniti Fx45
- Infiniti G20
- Infiniti G35
- Infiniti G37
- Infiniti I30
- Infiniti I35
- Infiniti J30
- Infiniti M35
- Infiniti M45
- Infiniti Q45
- Infiniti Qx4
- Infiniti Qx56
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B0491 Infiniti Trouble Repair :
With B0491 Infiniti code so start with the basics like a fuel pressure and fuel volume test. Or, you can start on the electrical side by doing a voltage drop on both the power and ground connections for the fuel pump. Some shops are reporting corrosion on the fuel pump ground that reduces power and fuel pressure. |
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