Fault code P0773 is called “Shift Solenoid “E” Electrical” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.
Technical description and explained code P0773
This diagnostic trouble code (DTC) is a generic transmission code. Error P0773 is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.
OBD-II trouble code P0773 is set when the control module (PCM) detects an electrical problem in the shift solenoid valve “E” circuit. Most automatic transmissions have at least three valves which are labeled A, B and C.
The code set is based on a specific fault that alerts the PCM and turns on the check engine light.
The shift solenoid valve circuit is designed to control the operation of the shift solenoids. To control fluid movement between the various hydraulic circuits and change the transmission ratio at the appropriate time.
This process maximizes engine performance levels at the lowest possible rpm. Transmission solenoids are responsible for opening or closing valves, allowing transmission fluid to flow to the clutches. For smooth transmission shifting when the engine accelerates.
When the powertrain control module (PCM) detects an electrical fault in the “E” shift solenoid valve circuit. Fault code P0773 will be written to memory, and an error message will appear on the control panel.
Symptoms of vehicle malfunctions
The main signal that an error P0773 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.
It can also be warning signs such as:
- The “Check engine” control lamp on the control panel will light up (the code will be recorded in the memory as a fault).
- The vehicle goes into emergency mode.
- The transmission slips when shifting gears.
- Transmission is stuck in gear.
- Shifting gears is hard.
- Transmission overheating.
- Increased fuel consumption.
- Possible symptoms similar to ignition failure.
Depending on the symptoms, the error P0773 may be moderate or serious. If there are problems with gear shifting, it is recommended to troubleshoot the problem as soon as possible.
Factors that can cause this error code
The error code P0773 can mean that one or more of the following problems have occurred:
- Faulty shift solenoid valve “E”.
- Contaminated fluid or clogged transmission filter.
- Low transmission fluid level.
- Transmission fluid passages are clogged.
- Faulty transmission pump or transmission valve housing.
- Other mechanical problems inside the transmission.
- A wiring problem or damaged connector.
- In rare cases, malfunction of PCM or TCM.
How to fix or reset OBD-2 code P0773
Some suggested steps for troubleshooting and fix the error code P0773:
- Replace the ATF fluid and filters.
- Fill the transmission fluid to the required level.
- Flush to clean the internal passages of the transmission.
- Test and replace faulty shift solenoid valve “E” if necessary.
- Repair or replace the defective transmission pump as well as the transmission valve housing.
- Check the connectors as well as the wiring.
- Flash or replace PCM or TCM.
Diagnose and repair of problems
Before you begin the process of troubleshooting P0773, you should research the Technical Service Bulletins (TSBs) for your particular vehicle. In some cases, this can save you a lot of time by pointing you in the right direction.
Next, you should check the fluid level and check for contamination. Before replacing the fluid, you should check the vehicle’s records to see when the filter and fluid were last changed.
After that, you should do a detailed visual inspection and also check the condition of the wiring for obvious defects. Check the connectors and wiring going to the shift solenoid valve, transmission pump and PCM. Depending on the configuration, the transmission pump may be electrically or mechanically driven.
Normal readings for wiring and connections should be 0 ohms of resistance. Wiring continuity checks should always be performed with power disconnected from the circuit. To avoid short-circuiting and creating additional damage.
Resistance or lack of continuity indicates faulty wiring that is open or shorted. In this case, repair or replacement will be required.
On which vehicles does this problem occur most frequently
Fault code P0773 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:
- Dodge (RAM)
- Ford (Falcon)
- Hyundai (Grand Starex, Starex)
- Kia (Ceed, Sorento)
- Mazda (3, 6, Demio, Familia)
- Opel (Astra, Vectra, Zafira)
- Toyota (4Runner, Camry, Celica, Corolla, Matrix, RAV4)
- Volkswagen (Jetta)
Fault code P0773 can sometimes be found with other errors. The most common are the following: P0141, P0340, P0730, P0743, P0753, P0763, P0770, P0771, P0772, P0774, P0785, P1135.