WOMS
P code powertrain Medium severity

P1737 Lockup Solenoid System

The OBD2 code P1737 indicates a malfunction in the lockup solenoid system, which is responsible for controlling the engagement of the torque converter lockup in an automatic transmission

Definition

The OBD2 code P1737 indicates a malfunction in the lockup solenoid system, which is responsible for controlling the engagement of the torque converter lockup in an automatic transmission

Common causes

  • Faulty lockup solenoid
  • Wiring issues or damaged connectors
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission control module (TCM)
  • Malfunctioning torque converter
  • Internal transmission problems
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Incorrectly diagnosed torque converter issues
  • Engine performance problems
  • Faulty speed sensors
  • Misinterpretation of other transmission codes

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help in diagnosing the issue more effectively

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the lockup solenoid. Look for signs of damage, corrosion, or loose connections. Repair or replace any damaged components

  3. 3. Test the Lockup Solenoid

    If accessible, test the lockup solenoid for proper operation. This may involve measuring resistance with a multimeter or applying voltage to see if it activates. Consult the vehicle's service manual for specific testing procedures and specifications

  4. 4. Check Transmission Fluid

    Ensure that the transmission fluid is at the correct level and in good condition. Low or contaminated fluid can affect transmission performance and solenoid operation

  5. 5. Inspect Transmission Control Module (TCM)

    Check the TCM for any signs of damage or malfunction. If the TCM is faulty, it may not be sending the correct signals to the lockup solenoid

  6. 6. Perform a Transmission Fluid Flush

    If the fluid is dirty or burnt, consider performing a transmission fluid flush and replacing the filter. This can help improve transmission performance

  7. 7. Check for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the lockup operation, such as worn clutches or internal leaks

  8. 8. Clear Codes and Test Drive

    After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  9. 9. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair. Always refer to the specific service manual for your vehicle for detailed procedures and specifications, as they can vary by make and model