Transmission

P0757 — Shift Solenoid C Stuck On

Severity: medium Drive with care, to a shop

What P0757 means

The transmission control module (TCM) commands shift solenoids in the valve body to direct fluid pressure and apply the right gears. P0757 sets when solenoid C appears to be stuck on, or the transmission behaves as if it is. The actual gear ratio then doesn't match what the TCM commanded.

Symptoms

  • Harsh or banging shifts
  • Missed or skipped gears
  • Transmission limp mode
  • Slipping between gears
  • Check engine light on

Possible causes

  1. Failed shift solenoid C (stuck, open or worn)
  2. Dirty or burnt ATF clogging the solenoid
  3. Valve body wear or debris
  4. Damaged wiring or corroded connector at the transmission
  5. TCM solenoid driver fault
  6. Fluid leaking into the internal wiring harness

How to diagnose

  1. Scan all codes and freeze-frame data, noting any other transmission codes
  2. Check ATF level, color and smell, and look for debris
  3. Inspect the transmission connector and harness for fluid, corrosion or damage
  4. Measure solenoid C resistance against specs and test the circuit for opens and shorts to ground
  5. Check power and control signal at the solenoid with a scan tool or scope
  6. Drop the pan and inspect the magnet and filter for metal debris
  7. Test fluid pressure and valve body operation if the electrical side checks out

Common fixes

  • Change the ATF and filter
  • Replace shift solenoid C
  • Repair the wiring or connector
  • Clean or rebuild the valve body
  • Replace or reprogram the TCM if confirmed faulty

Questions and answers

What does P0757 mean?

The transmission control module has detected that shift solenoid C is stuck on. This can cause harsh shifts or the wrong gear being selected.

Can I drive with code P0757?

Only briefly and gently, to reach a shop. Extended driving with slipping can damage the clutches and valve body.

Will changing the fluid fix P0757?

Sometimes, if dirty fluid was clogging the solenoid. If the solenoid or valve body is worn, it will need replacement or repair.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.