Error code

OBD2 P0785

OBD2P0785
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Shift/Timing Solenoid.

Severity

highDriving may be possible but the transmission will likely experience issues such as harsh shifting and slippage.

Summary

P0785 indicates a malfunction in the shift/timing solenoid circuit within the transmission's control system.

Symptoms

  • Malfunction Indicator Lamp (MIL) lights on
  • Failure to shift from or into any particular gear
  • Harsh shifting
  • Slippage
  • Transmission overheating
  • Decreased fuel efficiency
  • TCM/PCM may enter 'limp-in' mode

Common Causes

  • Defective shift solenoid
  • Hydraulic blockages inside the internal transmission fluid passages
  • Mechanical internal transmission failures
  • Low or contaminated transmission fluid
  • Shift solenoid valve harness is open or shorted
  • Shift solenoid valve circuit poor electrical connection
  • Defective PCM/TCM

Diagnosis

  1. Check for open or shorted circuits in the shift solenoid valve harness.
  2. Inspect the internal transmission fluid passages for blockages.
  3. Test the resistance of the shift solenoids to ensure they are within normal range (10-15 ohms for ON/OFF type, 4-6 ohms for PWM type).
  4. Check for related chassis or body system codes that could affect drivetrain components.

Fixes

  • Replace the faulty shift solenoid.

FAQ

What does P0785 mean?

P0785 indicates a malfunction in the shift/timing solenoid circuit within the transmission's control system.

How do I diagnose P0785?

Diagnose by checking for open or shorted circuits, inspecting internal fluid passages, testing solenoid resistance, and looking for related chassis/body codes.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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