Code
P0773
GWM
P — Powertrain
- Damage to the electrical circuit of the solenoid switch E
Views:
UK: 19
EN: 33
RU: 29
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the Shift Solenoid E circuit
- Poor connector contact, corrosion, bent or pushed‑out pins at solenoid or ECM/TCM connector
- Faulty shift solenoid E (stuck, coil short or open)
- Poor ground or low battery/charging system voltage
- Damaged valve body or hydraulic fault affecting solenoid operation
- Faulty Transmission Control Module (TCM/PCM) or internal driver failure
Symptoms
- MIL/Check Engine Light on with P0773 logged
- Transmission may go into limp/ failsafe mode (limited gear range)
- Harsh, delayed, or no shifting for gears controlled by solenoid E
- Unexpected gear engagement or slipping under load
- Intermittent shift faults or codes that reappear after clearing
What to check
- Read and record freeze frame and all stored transmission codes with a capable scan tool
- Check battery voltage and charging system (should be ~12.4–14.5 V with engine running)
- Visually inspect wiring and connectors at shift solenoid E and at ECM/TCM for corrosion, damaged insulation, or pushed‑out pins
- Backprobe the solenoid connector while commanding the solenoid ON/OFF with a scan tool and observe voltage/signal changes
- Measure DC resistance of the solenoid coil (with harness disconnected)
- Perform wiggle test on harness while monitoring live data for intermittent changes
Signal parameters
- Solenoid coil DC resistance (typical): ~10–40 ohms (manufacturer dependent) — measure at ambient temperature
- Command voltage when ON: pulsed PWM referenced to battery voltage (0–battery volts); steady apply may show ~12 V when directly powered
- Expected response in data: commanded ON -> solenoid command changes from 0% to commanded duty cycle and current increases
- Typical activation current: ~0.3–2 A depending on solenoid design
- Duty cycle range: 0–100% (normal control uses PWM); switching frequency usually low (tens to low hundreds of Hz)
Diagnostic algorithm
- Connect a capable scan tool and confirm P0773 and any related codes; record freeze frame data
- Clear codes and attempt to reproduce; note if P0773 returns immediately or intermittently
- Check battery voltage; if low, fully charge battery and retest
- Visually inspect solenoid connector and wiring for damage, corrosion, or loose pins; repair or secure as needed
- Unplug solenoid connector and measure coil resistance between solenoid terminals; compare to specification (if out of range, replace solenoid)
- Backprobe harness at solenoid while commanding ON/OFF with scan tool: verify control voltage/pulse and ground reference change when commanded
- If no command voltage at solenoid but command present at TCM/PCM connector, check continuity between PCM and solenoid; repair open/shorts
- If voltage present at solenoid but solenoid does not energize and coil resistance OK, bench test solenoid with known good 12 V supply (brief pulses) to confirm mechanical/electrical operation
- Inspect and clean connectors; repair any damaged wiring or pins (crimp/solder and heat‑shrink or use OEM repair methods)
- If wiring and solenoid test good but code persists, suspect TCM/PCM driver fault — verify with manufacturer diagnostic procedures and consider module replacement or reprogramming only after other causes eliminated
Likely causes
- Wiring harness damage or connector corrosion at solenoid
- Failed/shorted solenoid coil
- Poor ground or low battery voltage during command
- Connector pin deformation or intermittent connection
Fault status
Status
P0773 - Shift Solenoid E Electrical fault detected (electrical circuit open/short/intermittent)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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