Shift Solenoid E Electrical Malfunction
The P0773 code indicates an electrical fault in the shift solenoid E circuit, which is part of the transmission's hydraulic control system. This solenoid regulates fluid flow to engage specific gears. An electrical issue—such as an open or short circuit, high resistance, or a faulty solenoid—can prevent proper gear shifting, leading to transmission performance problems.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission stuck in a single gear (limp mode)
- Decreased fuel economy
2. Most Common Causes
- Faulty shift solenoid 'E' (open or shorted coil)
- Short to ground, short to battery, or open circuit in the control wiring
- Corroded, loose, or damaged terminals at the solenoid or TCM connectors
- Blown solenoid circuit fuse
- Defective transmission control module (TCM) (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition.
Step 3: Visually check wiring and connectors for damage or corrosion.
Step 4: Test solenoid resistance with a multimeter (specs vary by vehicle).
Step 5: Perform a solenoid power/ground test at the PCM connector.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with P0773 can cause erratic shifting or transmission damage. Limp mode may limit speed, but continued driving could worsen internal wear.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether the solenoid alone needs replacement or if wiring repairs are needed. Labor and parts vary by vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.