Faulty shift solenoid E (stuck, worn or failed internally); Damaged wiring, chafed loom or poor connector contact in the solenoid circuit; Low, degraded or contaminated transmission fluid; Blocked internal filter or debris in the valve body restricting solenoid operation; Worn valve body or internal hydraulic circuit leakage; Fault in the transmission control unit or its power and earth supplies; Outdated control unit software where a known fault is documented for that model.

P0770

Shift Solenoid E.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
70: FaultThe specific fault in that area

What it means

P0770 is the generic code for a fault in the shift solenoid E circuit. The transmission control unit commands shift solenoid E and monitors its electrical circuit and/or the resulting gear behaviour. If the circuit is open, shorted, or the solenoid does not do what is commanded, the code is stored and the warning lamp may come on. The generic definition does not say whether the fault is electrical or mechanical, and which gears use solenoid E depends on the transmission.

Symptoms

Gearbox warning light or engine management light on
Transmission stuck in one gear (limp mode)
Harsh, delayed or flared gear changes
Missing gears or unable to select certain ratios
Poor fuel economy or reduced performance
Torque converter lock-up not engaging

Possible causes

Faulty shift solenoid E (stuck, worn or failed internally)likely
Damaged wiring, chafed loom or poor connector contact in the solenoid circuitlikely
Low, degraded or contaminated transmission fluidlikely
Blocked internal filter or debris in the valve body restricting solenoid operationpossible
Worn valve body or internal hydraulic circuit leakagepossible
Fault in the transmission control unit or its power and earth suppliesrare
Outdated control unit software where a known fault is documented for that modelrare

How to diagnose

Read all stored codes and freeze frame data to see gear, speed, temperature and load when the fault set, and note any other transmission or engine codes.
Check the transmission fluid level and condition (where a dipstick or check procedure exists), looking for burnt smell, dark colour or metal debris.
Visually inspect the transmission wiring and connector for chafing, heat damage, fluid ingress, corrosion or bent pins.
Check the battery condition and charging voltage, as low voltage can cause false solenoid faults.
Measure the solenoid resistance and compare it with the manufacturer specification for that model.
Check the wiring between the solenoid and control unit for continuity, short to earth and short to supply, and check the control unit supplies and earths.
Use a scan tool's actuator tests or live data, where supported, to see whether the solenoid responds to commands.
Check for manufacturer service bulletins or available software updates for the vehicle, and drop the pan to inspect for debris if the above is inconclusive.

How to fix

Repair or replace damaged wiring and clean or replace faulty connectors.
Replace the shift solenoid E, or the solenoid pack, as the model requires.
Correct the fluid level, or change the fluid and filter using the specified type and procedure.
Clean or overhaul the valve body, or replace it if worn or damaged.
Apply an official software update if an outdated calibration is a known cause for that vehicle.
Repair or replace the transmission control unit only after wiring, supply and solenoid faults are ruled out.

Can I keep driving?

Medium severity

The car can usually be driven short distances if it shifts normally, but the transmission may drop into limp mode and further driving can cause extra wear. Book it in soon and avoid heavy loads or towing until it is diagnosed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.