Code
P0782
GWM
P — Powertrain
- Fault 2-3 switches
Views:
UK: 5
EN: 2
RU: 2
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the 2-3 shift solenoid/valve
- Poor connector contact (corrosion, bent pins, water intrusion)
- Failed 2-3 shift solenoid or valve assembly
- Contaminated or low transmission fluid affecting solenoid/valve operation
- Faulty transmission control module (TCM) or internal driver
- Valve body hydraulic fault or clogged passages
Symptoms
- Check Engine Light / MIL on with P0782 stored
- Harsh, delayed, or no shift between 2nd and 3rd gear
- Transmission stuck in a gear or in limp/hard-override mode
- Erratic shifting or gear hunting between 2nd and 3rd
- Reduced drivability or torque interruption during shift
- Possible transmission fault codes related to other solenoids or TCM
What to check
- Scan for P0782 and any additional transmission/TCM codes; record freeze-frame data
- Check transmission fluid level & condition (contamination, burnt smell)
- Visually inspect wiring and connectors to the 2-3 solenoid/valve for damage or corrosion
- Backprobe connector while commanding solenoid ON/OFF to observe voltage and switching
- Measure solenoid coil resistance at the connector with harness disconnected
- Check for proper ground and battery voltage at the solenoid circuit
Signal parameters
- Typical solenoid coil resistance: often ~10–50 Ω (manufacturer-specific — consult service data)
- Command voltage: ~0–12 V (or PWM duty cycle when controlled by TCM)
- PWM frequency (if used): commonly 50–300 Hz depending on transmission design
- When commanded ON: controller should supply voltage/pulse and measured current should rise; when OFF: near 0 V
- No-load continuity between harness pin and solenoid ground; no short to battery or chassis
Diagnostic algorithm
- Retrieve all codes and freeze-frame data. Note conditions when fault set (temp, speed, load).
- Check transmission fluid level/condition and top or replace fluid/filter if contaminated.
- Visually inspect wiring harness and connectors for the 2-3 solenoid/valve. Repair chafing or corrosion.
- With ignition ON, backprobe the solenoid connector. Command the solenoid ON/OFF from the scanner and observe voltage/PWM and ECU response.
- Measure solenoid coil resistance with harness disconnected. Compare to manufacturer spec. Replace solenoid if out of range or open/shorted.
- Perform a wiggle/intermittent test on harness while monitoring live data to catch intermittent opens/shorts.
- Check continuity from the TCM driver pin to the solenoid connector; verify proper ground and battery feed under load.
- If wiring and solenoid test good, inspect valve body for sticking valves or contamination; clean or rebuild as required.
- If valve body and solenoid are good, test/replace the TCM only after verifying all wiring and hydraulic components.
- Clear codes and road-test to confirm repair; monitor for reappearance and re-scan for related codes.
Likely causes
- Damaged wiring harness or rubbed-through insulation to the solenoid
- Corroded/loose connector at the solenoid or valve body
- Failed solenoid (coil open/short or internal mechanical failure)
- Low or dirty ATF preventing correct valve movement
Fault status
Status
TCM detected incorrect operation or electrical fault in the 2→3 shift control circuit (2-3 shift solenoid/valve); MIL illuminated and transmission may enter limp mode.
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
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