The P0773 diagnostic trouble code (DTC) indicates an electrical issue within the circuit controlling shift solenoid E in an automatic transmission. This code signifies a problem with the solenoid itself, its wiring, or the transmission control module (TCM), potentially impacting the vehicle's ability to shift gears correctly. Addressing this issue promptly is crucial to prevent further transmission damage and ensure safe vehicle operation.

| Component | Description

Detailed Explanations

Component: This refers to the specific part of the vehicle being addressed by the diagnostic trouble code. In this case, it's the shift solenoid E.

Description: This section provides a detailed explanation of the component and its function. The shift solenoid E is an electrically controlled valve within the automatic transmission. Its primary function is to regulate the flow of hydraulic fluid to various parts of the transmission, enabling the correct gear shifts at the appropriate times. It receives signals from the Transmission Control Module (TCM) to open or close, thus controlling the engagement of different gears. The "electrical" aspect of the code indicates a problem with the electrical circuit that powers or controls the solenoid, rather than a mechanical failure within the transmission itself. This could involve issues like a short circuit, open circuit, or high resistance in the wiring or the solenoid coil.

Possible Causes: The P0773 code can stem from several potential issues:

  • Faulty Shift Solenoid E: The solenoid itself may be defective. The internal coil could be open, shorted, or have excessive resistance.
  • Wiring Issues: Damaged, corroded, or loose wiring connections to the shift solenoid E can disrupt the electrical signal. This includes the wiring harness and connectors leading to the solenoid.
  • Open or Short in the Circuit: An open circuit means the electrical path is broken, preventing current flow. A short circuit means the current is taking an unintended path to ground.
  • Connector Corrosion: Corrosion within the connector can increase resistance and prevent proper electrical contact.
  • Transmission Control Module (TCM) Failure: In rare cases, the TCM may be sending incorrect signals or failing to control the shift solenoid E properly. The TCM is the computer that controls the automatic transmission's operation.
  • Low Transmission Fluid: While not directly an electrical issue, extremely low transmission fluid can sometimes cause erratic solenoid behavior and trigger codes.
  • Internal Transmission Damage: Although the code indicates an electrical problem, severe internal transmission damage can indirectly affect solenoid operation.

Symptoms: When the P0773 code is present, you might experience the following symptoms:

  • Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  • Transmission Slipping: The transmission may slip between gears, causing a loss of power or acceleration.
  • Harsh Shifting: Shifts may become rough or jerky.
  • Stuck in Gear: The transmission might get stuck in a particular gear and refuse to shift.
  • Reduced Fuel Economy: Inefficient shifting can lead to decreased fuel mileage.
  • Transmission Failure: In severe cases, if the problem is ignored, it can lead to complete transmission failure.
  • Limp Mode: The vehicle may enter "limp mode," which limits engine power and speed to protect the transmission.

Diagnosis: Diagnosing the P0773 code requires a systematic approach:

  1. Scan the Vehicle: Use an OBD-II scanner to confirm the presence of the P0773 code and any other related codes.
  2. Inspect Wiring and Connectors: Visually inspect the wiring and connectors leading to the shift solenoid E for any signs of damage, corrosion, or looseness. Repair or replace any damaged components.
  3. Check Transmission Fluid Level: Verify the transmission fluid level is within the recommended range. Add fluid if necessary.
  4. Test Shift Solenoid E: Use a multimeter to check the resistance of the shift solenoid E. Compare the reading to the manufacturer's specifications. An open or shorted solenoid indicates a problem.
  5. Check for Voltage at the Solenoid Connector: With the ignition on, check for voltage at the solenoid connector using a multimeter. This will verify that the solenoid is receiving power from the TCM.
  6. Perform a Circuit Test: Use a multimeter to check the continuity of the wiring between the TCM and the shift solenoid E. This will identify any open or short circuits in the wiring.
  7. Inspect the TCM: If all other components test good, the TCM may be faulty. This is the least likely cause, and a professional diagnosis is recommended.

Possible Solutions: The solution depends on the root cause of the problem:

  • Replace Shift Solenoid E: If the solenoid is faulty, replacing it is the most common solution.
  • Repair or Replace Wiring: Repair or replace any damaged or corroded wiring and connectors.
  • Clean Connectors: Clean corroded connectors with electrical contact cleaner.
  • Refill Transmission Fluid: If the fluid level is low, refill it to the correct level.
  • Replace TCM: If the TCM is faulty, it will need to be replaced and programmed. This should be done by a qualified technician.
  • Address Internal Transmission Issues: If internal transmission damage is contributing to the problem, a more extensive repair or replacement of the transmission may be necessary.

Tools Needed: To diagnose and repair the P0773 code, you will typically need the following tools:

  • OBD-II Scanner: To read and clear diagnostic trouble codes.
  • Multimeter: To test electrical circuits and components.
  • Wiring Diagram: To understand the wiring of the transmission control system.
  • Socket Set and Wrenches: To remove and install components.
  • Electrical Contact Cleaner: To clean corroded connectors.
  • Wire Strippers and Crimpers: To repair wiring.
  • Transmission Fluid: To refill the transmission fluid.
  • Jack and Jack Stands: To safely access the underside of the vehicle.

Severity: The severity of the P0773 code can range from moderate to severe. If the transmission is slipping or stuck in gear, it can affect the vehicle's drivability and safety. Ignoring the problem can lead to further transmission damage and potentially a complete transmission failure, which is a costly repair.

Cost of Repair: The cost of repairing the P0773 code can vary depending on the cause of the problem and the labor rates in your area.

  • Shift Solenoid E Replacement: The cost of replacing the shift solenoid E can range from $150 to $500, including parts and labor.
  • Wiring Repair: The cost of repairing wiring can range from $50 to $300, depending on the extent of the damage.
  • TCM Replacement: The cost of replacing the TCM can range from $500 to $1500, including parts and programming.
  • Transmission Repair or Replacement: If internal transmission damage is present, the cost of repair or replacement can range from $1500 to $5000 or more.

Related Codes: Several other diagnostic trouble codes may be related to the P0773 code:

  • P0770: Shift Solenoid E Malfunction
  • P0771: Shift Solenoid E Performance or Stuck Off
  • P0772: Shift Solenoid E Stuck On
  • P0774: Shift Solenoid E Intermittent

Understanding these related codes can help in diagnosing the underlying problem.

Frequently Asked Questions

What does the P0773 code mean? It indicates an electrical issue with the shift solenoid E circuit in your automatic transmission.

Can I drive with a P0773 code? It's not recommended, as it can cause transmission damage and affect drivability.

What are the common symptoms of a P0773 code? Common symptoms include a check engine light, transmission slipping, and harsh shifting.

How do I fix a P0773 code? Possible solutions include replacing the shift solenoid, repairing wiring, or replacing the TCM.

How much does it cost to fix a P0773 code? The cost varies depending on the cause, but could range from $150 to over $1500.

Conclusion

The P0773 code signals an electrical fault within the shift solenoid E circuit, potentially leading to transmission problems. A thorough diagnosis is critical to pinpoint the exact cause, and prompt repairs are essential to prevent further damage to the transmission and ensure safe vehicle operation.