Code
P076C
Generic
P — Powertrain
Shift Solenoid H Stuck On
Views:
UK: 20
EN: 24
RU: 17
AI status
Completed
Completed
100%
Causes
- Short or low resistance in solenoid circuit (wiring short to battery or ground)
- Stuck or mechanically failed shift solenoid/valve (internal to valve body)
- Faulty transmission control module (TCM) or driver transistor
- Corroded/loose connector or poor pin contact at solenoid harness
- Contaminated or degraded transmission fluid causing valve sticking
- Intermittent open/short in wiring harness (chafing, pinched, or damaged insulation)
Symptoms
- Check Engine Light / transmission MIL illuminated
- Transmission stuck in certain gear or fails to shift properly
- Harsh or delayed shifts, or transmission stays in high/low gear
- Limp-home mode (reduced gear range) may be active
- Unusual transmission noise or fluid pressure issues
What to check
- Retrieve permanent/freeze-frame data and full list of stored codes with a scan tool
- Visually inspect solenoid H connector and harness for corrosion, bent pins, loose or damaged wires
- Check transmission fluid level and condition (burnt smell, metal particles)
- Using scan tool, command solenoid H ON/OFF and observe commanded status and any change in behavior
- Check for additional related codes (TCM, system voltage, or pressure sensor codes)
Signal parameters
- Solenoid coil resistance (typical range 6–40 Ω; manufacturer spec required)
- Idle/Off voltage at harness: ~0 V (open circuit)
- Commanded On: PWM or switched 12 V depending on vehicle (duty cycle 0–100%)
- When commanded On, current draw should rise to expected level (verify with clamp meter); stuck-on may show continuous voltage/current when commanded Off
- PWM frequency typically 50–300 Hz on many transmissions (refer to vehicle spec)
Diagnostic algorithm
- Record freeze frame and all related DTCs with a OEM-capable scan tool.
- Clear codes and attempt to reproduce. Note whether P076C returns immediately or after driving.
- Visually inspect solenoid H connector and harness for corrosion, pin damage, or wiring chafing. Repair any obvious damage and reconnect securely.
- Measure solenoid coil resistance at the connector (unplug harness from solenoid). Compare to spec. If resistance is very low (near short) or infinite, suspect solenoid fault.
- With harness disconnected, check harness continuity to TCM and for shorts to battery or ground. Back-probe connector: verify voltage present only when commanded (use scan tool to command ON/OFF).
- Command solenoid H ON/OFF with scan tool while monitoring voltage and current. If solenoid is commanded Off but voltage/current present, suspect short in wiring or TCM driver failure.
- Bench test solenoid by applying appropriate battery voltage (or PWM as required) to confirm mechanical operation and current draw. Replace if it does not operate or draws abnormal current.
- If wiring, connector, and solenoid test good, investigate valve body for internal stuck spool or contamination; remove valve body as required for inspection and cleaning or replacement.
- If repairs performed, clear codes and test drive. If problem persists with verified wiring and solenoid replacement, consider TCM/PCM driver fault and pursue module testing or replacement per manufacturer procedure.
Likely causes
- Faulty/shorted shift solenoid H
- Corroded or damaged solenoid connector or harness near transmission
- Transmission fluid contamination causing valve to stick
- Valve body internal fault (sticking spool or debris)
Fault status
Status
Shift Solenoid H Control Circuit — solenoid stuck ON (TCM detects ON when it should be OFF).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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