P0770

Code

GWM P — Powertrain

- Malfunction of solenoid switch E

Brand: GWM

Type: P — Powertrain

Views: UK: 2 EN: 2 RU: 3

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Page language: EN

Causes

Failed shift solenoid E (electromechanical valve)
Open or shorted wiring between solenoid and TCM
Poor connector pins, corrosion, or loose terminal
Faulty TCM output driver
Contaminated or low transmission fluid causing solenoid sticking
Valve body internal damage or debris

Symptoms

Check Engine / Transmission warning lamp illuminated
Harsh or delayed shifts, slipping, or inability to shift
Transmission stuck in a single gear or limp-home mode
Erratic shift behavior (surging/shuddering)
Stored or intermittent fault codes related to transmission control

What to check

Read freeze-frame and live data with a capable scan tool; attempt to command solenoid E on/off
Check transmission fluid level and condition (burnt smell, metal debris)
Visually inspect solenoid connector and wiring for damage, corrosion, or looseness
Measure solenoid coil resistance at connector (with harness disconnected)
Back-probe harness while commanding solenoid to verify voltage/pulse and ground
Check TCM power, ground, and related fuses/relays

Signal parameters

Nominal coil resistance: typically tens of ohms (often ~10–50 Ω depending on design) — consult vehicle-specific data
Open circuit: very high/OL; Short to ground: very low (
When commanded ON: control circuit should show battery voltage or PWM drive (0–12 V range); when OFF: 0 V or open depending on circuit
Pulse-width modulation possible — duty cycle varies with commanded force (0–100%), frequency typically tens to low hundreds of Hz on many systems
Current draw when energized: typically a few hundred mA to ~2 A; abnormal high or zero current indicates fault

Diagnostic algorithm

Connect a scan tool, read P0770 and any related codes; note freeze-frame and MIL conditions.
Check transmission fluid level/condition; top or replace fluid if severely contaminated and retest.
Visually inspect connectors and wiring for damage; repair any chafed wires or corroded pins.
With harness disconnected, measure solenoid coil resistance and compare to spec. Replace solenoid if out of range.
Reconnect and back-probe the solenoid connector. Command ON/OFF from the scan tool while monitoring voltage, duty cycle, and current. Confirm the solenoid responds audibly/physically if accessible.
If the solenoid receives correct drive but does not actuate, replace the solenoid/valve or service the valve body as required.
If no drive signal is present or signal is incorrect, trace continuity from TCM to solenoid, check grounds and power feeds, repair wiring, or replace TCM if driver output is confirmed faulty.
After repairs, clear codes and perform road test and long-term monitoring to ensure code does not return.
If intermittent, perform wiggle tests and consider harness replacement or harness consolidation at problem areas.

Likely causes

Solenoid coil internal failure
Damaged harness (chafing, pinched, rodent damage)
Corroded/dirty connector at solenoid or transmission
Low or degraded transmission fluid allowing valve sticking

Fault status

⚠️ Status

DTC P0770 — Shift Solenoid E malfunction detected by TCM. Indicates electrical fault (open/short/intermittent) or solenoid/valve failure affecting gear control.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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P0770 — - Malfunction of solenoid switch E