C1859 PRNDL Input Sensor Circuit Failure

OBD2 Code: C1859

Description: PRNDL Input Sensor Circuit Failure

Definition: The OBD2 code C1859 indicates a malfunction in the circuit responsible for detecting the position of the gear selector (Park, Reverse, Neutral, Drive, Low) within the vehicle’s transmission system. This can affect the vehicle’s ability to correctly identify and engage gears.

C1859 – PRNDL Input Sensor Circuit Failure

Typical Severity: Moderate

Common Causes

C1859 – PRNDL Input Sensor Circuit Failure

Common Causes:

• Faulty PRNDL input sensor
• Corroded or damaged wiring/connectors in the PRNDL circuit
• Faulty transmission control module (TCM)
• Short circuit or open circuit in the PRNDL input sensor circuit

 

Common Misdiagnosis

OBD2 Code: C1859

Description: PRNDL Input Sensor Circuit Failure

Common Misdiagnosis: Replacing the transmission control module (TCM) without verifying the integrity of the wiring or connections to the PRNDL input sensor.

 

Common Diagnostic Steps

C1859: PRNDL Input Sensor Circuit Failure

• Check for any stored codes and freeze frame data using an OBD2 scanner.
• Inspect the wiring and connectors related to the PRNDL input sensor for damage or corrosion.
• Test the voltage and ground signals at the PRNDL sensor connector using a multimeter.
• Verify that the PRNDL sensor is functioning correctly by testing its resistance values against manufacturer specifications.
• Examine the transmission range switch (if applicable) for proper operation.
• Clear the code and perform a test drive to see if it returns, indicating a persistent issue.