WOMS
P code powertrain Medium severity

P2748 Intermediate Shaft Speed Sensor B Circuit Intermittent

The OBD2 code P2748 indicates an intermittent issue with the Intermediate Shaft Speed Sensor B circuit, which may affect the transmission's ability to accurately monitor the speed of the intermediate shaft

Definition

The OBD2 code P2748 indicates an intermittent issue with the Intermediate Shaft Speed Sensor B circuit, which may affect the transmission's ability to accurately monitor the speed of the intermediate shaft

Common causes

  • Faulty intermediate shaft speed sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Faulty transmission control module (TCM)
  • Internal transmission issues
  • Corroded terminals
  • Software issues in the TCM
  • Mechanical problems with the intermediate shaft

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Defective intermediate shaft speed sensor A
  • Wiring or connector problems
  • Faulty transmission solenoids
  • Engine control module (ECM) issues
  • Incorrectly diagnosed transmission failure
  • Problems with the vehicle speed sensor (VSS)

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 the Wiring and Connectors

    Visually inspect the wiring and connectors associated with the Intermediate Shaft Speed Sensor B. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or poor connections

  5. 5. Signs of moisture or dirt ingress

  6. 6. Test the Intermediate Shaft Speed Sensor

    Use a multimeter to test the sensor's resistance and voltage output according to the manufacturer's specifications. If the readings are outside the specified range, the sensor may be faulty and need replacement

  7. 7. Check the Sensor Circuit

    Inspect the circuit for continuity and proper voltage. This includes checking for

  8. 8. Short circuits to ground or power

  9. 9. Open circuits

  10. 10. Proper voltage supply to the sensor

  11. 11. Examine the Transmission Control Module (TCM)

    Ensure that the TCM is functioning correctly. Sometimes, issues with the TCM can lead to erroneous sensor readings. Check for software updates or reprogramming if necessary

  12. 12. Look for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the sensor's operation, such as

  13. 13. Worn or damaged components

  14. 14. Low transmission fluid levels or dirty fluid

  15. 15. Clear the Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears

  16. 16. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P2748 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  17. 17. Seek Professional Help

    If the problem persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you can systematically identify and address the cause of the P2748 code