P0774
Shift Solenoid E Intermittent.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- 74
- FaultThe specific fault in that area
What it means
P0774 is the generic code for an intermittent fault in the shift solenoid E circuit of the automatic transmission. The transmission control unit has seen the solenoid circuit or its operation drop in and out, rather than fail constantly. Which gears or functions solenoid E controls depends on the transmission design, so the exact effect varies between models.
Symptoms
- Gearbox warning light or engine management light on
- Occasional harsh, flared or delayed gear changes
- Transmission briefly dropping into limp mode or a fixed gear, then recovering
- Intermittent loss of a particular gear or torque converter lock-up
- Poor or erratic fuel economy
- Fault appearing and disappearing with temperature or road vibration
Possible causes
- Intermittent wiring fault such as chafing, a broken strand or a poor connection in the solenoid E circuitlikely
- Corroded, loose or contaminated transmission connector or internal harness pluglikely
- Shift solenoid E with failing internal winding or sticking operationpossible
- Transmission fluid that is low, degraded or contaminated, affecting solenoid and valve body operationpossible
- Low or unstable battery or charging system voltage upsetting the control unit and solenoid supplypossible
- Valve body wear or debris causing intermittent hydraulic responserare
- Fault within the transmission control unit or an outdated calibration, where the manufacturer has documented this for the modelrare
How to diagnose
- Read all stored and pending codes and record freeze frame data, noting temperature, speed and load when the fault set
- Check for related codes, especially other solenoid, voltage or communication faults, and check for manufacturer service bulletins for the model
- Check the battery condition and charging voltage, as low voltage can cause intermittent solenoid faults
- Check transmission fluid level, condition and smell, following the manufacturer's procedure for the specific gearbox
- Inspect the wiring and connectors between the transmission and control unit for chafing, heat damage, corrosion, moisture and bent or pushed-back pins
- Wiggle-test the harness and connector with live data or a monitoring tool to see if the fault reproduces
- Test the solenoid E circuit for resistance, supply and ground against the manufacturer's specification for that transmission
- Where the pan must be dropped for inspection, check for metal debris or clutch material and inspect the solenoid and internal connector
How to fix
- Repair or replace damaged wiring and terminals in the solenoid E circuit
- Clean, reseat or replace the transmission connector or internal harness if corroded or damaged
- Replace shift solenoid E, or the solenoid pack where it is not sold separately
- Correct the fluid level or change the fluid and filter using the specification the manufacturer lists for that gearbox
- Repair battery or charging faults to restore stable voltage
- Apply an updated transmission control unit calibration only where the manufacturer lists it as a fix for this fault
Can I keep driving?
Medium severity
The car can usually be driven carefully for a short time, but the fault may worsen and cause harsh shifts or limp mode. Have it checked soon, and avoid heavy loads or towing until the transmission is diagnosed.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.