P0773
UniversalThe P0773 code indicates an electrical fault within the circuit of the Shift Solenoid 'E', preventing the Powertrain Control Module (PCM) from properly controlling transmission gear engagement.
Medium SeverityThis code signifies an electrical issue with the Shift Solenoid E, which is vital for regulating the transmission's gear shifts. Drivers might experience abnormal shifting, such as harsh or delayed shifts, or the vehicle could enter a 'limp mode' to protect the transmission.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is parked on a level surface with the parking brake engaged before attempting any work. For electrical diagnostics, it is crucial to disconnect the battery's negative terminal to prevent accidental shorts or injury.
Common Symptoms
- Check Engine Light illuminated
- Erratic or harsh shifting
- Delayed engagement of gears
- Transmission stuck in a single gear
- Vehicle entering 'limp mode'
- Reduced fuel economy
Common Causes
- Faulty Shift Solenoid E
- Open or short circuit in the Shift Solenoid E wiring harness
- Poor electrical connection at the solenoid or Transmission Control Module (TCM)
- Contaminated transmission fluid restricting solenoid operation
- Rarely, a faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Check transmission fluid level and condition; ensure it's clean and at the correct level.
- Visually inspect all wiring and connectors leading to the transmission and specifically the Shift Solenoid E for any signs of damage, corrosion, or loose connections.
- Using a multimeter, test the resistance of the Shift Solenoid E circuit. Compare readings to manufacturer specifications.
- If accessible, disconnect the Shift Solenoid E connector and check for proper voltage signals from the TCM/PCM according to the service manual.
- Clear the DTC and test drive the vehicle to see if the code returns.
👨🔧 When to Call a Professional
If after basic electrical checks you cannot pinpoint the exact cause or if the issue requires dropping the transmission pan, it is highly recommended to consult a professional automotive technician. Transmission work can be complex and requires specialized knowledge and tools.
Commonly Asked Questions
What is Shift Solenoid E?
Shift Solenoid E is an electrically controlled valve inside your automatic transmission that helps regulate the flow of transmission fluid to engage specific gears. An electrical fault means the computer cannot properly command it.
Can I drive with a P0773 code?
While you might be able to drive, it is not recommended. Continued driving with this code can lead to further transmission damage, potentially resulting in more costly repairs.
What tools do I need to diagnose P0773?
You will typically need a multimeter for electrical testing, basic hand tools (wrenches, screwdrivers), and potentially a service manual for your specific vehicle to get resistance values and wiring diagrams.
How do I test a shift solenoid?
A common test involves using a multimeter to measure the resistance (ohms) across the solenoid's terminals. The reading should fall within your vehicle's manufacturer-specified range. An open circuit or a very low resistance (short) indicates a faulty solenoid.
Is replacing a shift solenoid expensive?
The cost can vary greatly. The solenoid itself might be moderately priced, but the labor involved, especially if the transmission pan needs to be dropped or the transmission removed, can significantly increase the repair cost.