P1757 Code failures by brands


Description of DTC code P1757

Automatic transmissions use mainline, throttle pressure, and governor pressure to control and lubricate the transmission. The governor pressure allows the transmission to upshift, and the throttle pressure causes the transmission to downshift. Older transmissions had mechanical governors, which consisted of springs, centrifugal weights, and a spool valve to control the pressure. On the other hand, modern transmissions use solenoids for the shift timing.

With the regulator pressure control system, it is possible to adjust this factor, which in turn contributes to the changes for first, second, and third gear. In this system, various tests are carried out to check that the requested pressure and the actual pressure are within a pre-determined range.

The P1757 OBD2 fault code is stored when the monitored regulator pressure is higher than 41.4 kPa (6 psi) for 5 seconds, and the gear selector is in the drive position with the road speed equal to zero. For this code to be set, the transmission fluid temperature must be between 23 and 88° C (73 and 88° F).

Symptoms of fault code P1757

Causes of OBD2 P1757

Reasons for setting the P1757 OBDII diagnostic code:

  • The transmission oil may be contaminated or burnt.
  • Regulator Pressure Sensor may be in poor condition.
  • Regulator Pressure Sensor solenoid may be damaged.
  • The valve body may be defective.
  • The Motor Control Module's 5-volt power circuit may be open.
  • The ECM may be damaged.

Possible solutions of the DTC code P1757

To troubleshoot DTC P1757 OBD2, consider this:

  • First, refer to the Service Bulletins.
  • Use a scan tool to check that no additional DTCs are set in addition to the P1757 code. Repair all the codes in the order shown on the scan tool.
  • Check that the transmission oil level and condition are appropriate. If you find contaminated or burned oil, replace it.
  • Measure the voltage from the ECM supply circuit to the governor pressure control system. If you detect a short or open circuit, make corrections.

Codes related to P1757

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