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P1902 Pressure Control Solenoid "B" Intermittent Short

The OBD2 code P1902 indicates that there is an intermittent short circuit in the pressure control solenoid "B" circuit, which can affect the transmission's ability to regulate pressure properly

Definition

The OBD2 code P1902 indicates that there is an intermittent short circuit in the pressure control solenoid "B" circuit, which can affect the transmission's ability to regulate pressure properly

Common causes

  • Faulty pressure control solenoid "B"
  • Damaged wiring or connectors
  • Short circuit in the wiring harness
  • Poor electrical connections
  • Failed transmission control module (TCM)
  • Low transmission fluid levels
  • Contaminated transmission fluid
  • Internal transmission issues

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Wiring issues or shorts in the harness
  • Faulty Pressure Control Solenoid "A"
  • Low transmission fluid level or contamination
  • Faulty transmission valve body
  • Incorrectly installed or damaged transmission components
  • Faulty engine control module (ECM)
  • Transmission overheating issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the Pressure Control Solenoid "B" for any signs of damage, such as fraying, corrosion, or loose connections

  3. 3. Connector Condition

    Ensure that the connectors are securely attached and free of dirt or moisture

  4. 4. Test the Pressure Control Solenoid

    Resistance Check: Use a multimeter to measure the resistance of the solenoid. Compare the reading to the manufacturer’s specifications. If it’s out of range, the solenoid may be faulty

  5. 5. Functionality Test

    If possible, test the solenoid by applying power directly to it to see if it operates correctly

  6. 6. Check for Short Circuits

    Wiring Inspection: Look for any signs of short circuits in the wiring. This can include wires that are pinched, frayed, or touching other metal components

  7. 7. Continuity Test

    Perform a continuity test on the wiring to ensure there are no breaks or shorts in the circuit

  8. 8. Inspect the Transmission Fluid

    Fluid Condition: Check the transmission fluid for contamination or burning, which can affect solenoid operation

  9. 9. Fluid Level

    Ensure that the transmission fluid is at the correct level, as low fluid can cause erratic solenoid behavior

  10. 10. Check the Transmission Control Module (TCM)

    TCM Functionality: If the solenoid and wiring are in good condition, the issue may lie with the TCM. Check for any software updates or known issues with the TCM for your specific vehicle model

  11. 11. Reprogramming

    In some cases, reprogramming or resetting the TCM may resolve the issue

  12. 12. Perform a Road Test

    After making any repairs or adjustments, take the vehicle for a test drive to see if the code returns. Monitor the transmission performance for any irregularities

  13. 13. Clear Codes and Monitor

    Clear the trouble codes using the OBD-II scanner and monitor the vehicle for any reoccurrence of the P1902 code

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P1902 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  15. 15. Seek Professional Help

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with transmission issues and OBD-II diagnostics. By following these steps, you should be able to identify the root cause of the P1902 code and take appropriate action to resolve it