Shift Solenoid E Electrical
The P0773 code indicates that the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected an electrical malfunction in the transmission shift solenoid 'E' circuit. The computer sets this code when the voltage or resistance in this specific solenoid circuit falls outside of the expected manufacturer specifications, preventing proper gear shifts.
This code requires prompt attention as it can cause erratic shifting or put the vehicle into limp mode. Continued driving with a malfunctioning shift solenoid can lead to internal transmission damage over time.
Common symptoms
- Illuminated Check Engine Light
- Transmission slipping or failing to shift into certain gears
- Harsh, erratic, or delayed gear engagement
- Vehicle stuck in 'limp-home' mode (restricted to a single gear)
- Decreased fuel efficiency due to improper gear ratios
Likely causes
- Faulty shift solenoid E
- Dirty or contaminated transmission fluid
- Damaged, corroded, or loose wiring and connectors in the solenoid circuit
- Low transmission fluid level
- Blocked transmission fluid passages
- Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Low fluid levels or dark, burnt-smelling fluid which indicates contamination or internal transmission wear.
Inspect the wiring harness and connectors for the transmission and shift solenoid E.
Look for: Frayed wires, melted insulation, or corroded pins that would cause an open or short circuit.
Test the resistance of shift solenoid E using a digital multimeter.
Look for: Resistance readings outside the manufacturer's specified range, indicating a failed internal solenoid coil.
Apply direct voltage to the solenoid to check for mechanical operation, if accessible.
Look for: An audible click; if it does not click, the solenoid is mechanically stuck or electrically dead.
Check the TCM/PCM for output voltage to the solenoid circuit during a commanded shift.
Look for: Lack of voltage from the module when a shift is commanded, pointing to a wiring issue or a faulty control module.
This page explains the generic P0773 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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