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DTC codes / P07xx · Transmission / P0768

P0768Shift Solenoid 'D' Electrical

P0768 indicates that the transmission control module (TCM) has detected an electrical fault in the circuit for shift solenoid 'D', which is one of the solenoids that controls hydraulic pressure to engage or release a specific gear clutch. The computer monitors the solenoid's electrical current and sets this code when the circuit is open, shorted to ground, shorted to power, or when the solenoid's resistance is outside the expected range.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • The check engine light or transmission warning light illuminates on the dashboard.
  • The transmission may enter limp mode, defaulting to a single gear or a limited set of gears.
  • Harsh or delayed shifting, or a refusal to shift into certain gears.
  • The engine may rev unusually high or low for a given road speed due to incorrect gear selection.
  • Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

  1. Faulty shift solenoid 'D' itself, with an open or shorted internal coil.
  2. Damaged, chafed, or corroded wiring in the solenoid circuit, including the harness connector at the transmission.
  3. Poor electrical connection at the solenoid or at the TCM, such as loose pins or corrosion.
  4. Transmission fluid contamination or varnish buildup causing the solenoid to stick or draw excessive current.
  5. A failed TCM driver circuit that cannot properly control the solenoid.
  6. Internal transmission mechanical damage that affects solenoid operation or fluid pressure.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related transmission codes before proceeding.
  2. Inspect the transmission wiring harness and solenoid connector for damage, corrosion, or loose pins.
  3. Measure the resistance of shift solenoid 'D' at the transmission connector and compare it to the manufacturer's specification.
  4. Check the solenoid circuit for shorts to ground or power using a multimeter and wiring diagram.
  5. If electrical tests point to the solenoid, remove the transmission pan and replace shift solenoid 'D'.
  6. Clear the code and perform a road test to confirm the repair and ensure the transmission shifts correctly.
  7. If the fault persists after electrical repairs, diagnose the TCM and internal transmission components as needed.

Don't replace the solenoid before checking this

  • A common misdiagnosis is replacing shift solenoid 'D' when the real problem is a chafed wire in the harness near the transmission, so always perform a thorough circuit test first.
  • Contaminated transmission fluid can cause solenoid 'D' to stick or draw excessive current, setting P0768 even though the solenoid itself is electrically sound.
  • Some vehicles use a single solenoid for multiple gears, so a failure of solenoid 'D' may cause symptoms that mimic other transmission problems, leading to confusion.
  • Intermittent P0768 codes often result from a poor connection at the transmission pass-through connector, which can be fixed by cleaning and reseating the connector.
  • The TCM may set P0768 as a consequence of low system voltage or a weak battery, so check the charging system before condemning the solenoid.

Can I keep driving with P0768?

You can usually drive the vehicle with P0768, but the transmission may be in limp mode with limited gear selection, so avoid highway speeds and heavy loads. Have the fault diagnosed promptly to prevent further transmission damage and to restore normal operation.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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