C1609 Vehicle Speed Signal 2

OBD2 Code: C1609

Description: Vehicle Speed Signal 2

Definition: This code indicates a problem with the vehicle speed signal, which is used by various systems in the vehicle to determine the speed at which it is traveling. The “Signal 2” suggests that this is related to a secondary or backup signal path for vehicle speed information.

C1609 – Vehicle Speed Signal 2

Typical Severity: Low

Common Causes

C1609 – Vehicle Speed Signal 2

Description: The vehicle speed signal 2 is not being received properly by the engine control module.

Common Causes:

• Faulty vehicle speed sensor
• Wiring or connection issues in the vehicle speed sensor circuit
• Defective engine control module (ECM)
• Interference from other electrical components

 

Common Misdiagnosis

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OBD2 Code: C1609

Description: Vehicle Speed Signal 2

Common Misdiagnosis: Often misdiagnosed as a faulty speed sensor, when the issue may actually be related to wiring problems or a malfunctioning ABS module.

 

Common Diagnostic Steps

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OBD2 Code: C1609

Description: Vehicle Speed Signal 2

• Check the vehicle speed sensor and its wiring for any signs of damage or disconnection.
• Inspect the connectors and terminals for corrosion or poor connections.
• Use a multimeter to test the voltage and continuity of the vehicle speed sensor circuit.
• Verify that the wheel speed sensors are functioning correctly by checking their output signals with an oscilloscope.
• Examine the ABS module for any stored fault codes that might relate to wheel speed sensors or communication issues.
• If applicable, update the vehicle’s software using a scan tool to ensure all modules are communicating properly.
• If no faults are found in hardware, consider replacing the vehicle speed sensor as it may be faulty internally.