Description:

This diagnostic trouble code is generated when the PLC control unit detects a voltage of less than 4.8 volts at the positive power supply lead for the park lock pressure sensor (B90). This indicates a short to ground in the circuit.

Reaction:

The park lock pressure sensor may not function correctly, potentially affecting the vehicle’s ability to maintain the park lock.

Recommendations:

• Inspect Wiring and Connections:
  • Check for any signs of damage, corrosion, or loose connections in the wiring to the B90 park lock pressure sensor. Repair or replace as necessary.
• Check for Shorts to Ground:
  • Inspect the circuit for any shorts to ground and rectify any issues found.
• Test the Sensor:
  • Verify the functionality of the B90 park lock pressure sensor. Replace if faulty.
• Secure Connections:
  • Ensure all connections are secure and free from contamination.

Note:

Regular inspections and maintenance can prevent issues with low voltage in sensor circuits, ensuring the reliable operation of safety-critical systems like the park lock mechanism.