Code
P076A
Generic
P — Powertrain
Shift Solenoid H
Views:
UK: 26
EN: 31
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in the solenoid H wiring (connector, harness, chafing)
- Corroded or loose connector pins at solenoid or PCM
- Failed shift solenoid H (coil open, shorted, or mechanically stuck)
- Faulty transmission control module / PCM or software issue
- Low, dirty, or contaminated transmission fluid affecting valve operation
- Internal valve body or hydraulic fault preventing solenoid from moving the valve
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go into limp/limp-home mode (reduced gear range)
- Harsh, delayed, or erratic shifts involving the gear controlled by solenoid H
- Stuck in a single gear or inability to select certain gears
- Transmission slipping or abnormal engagement
- Diagnostic trouble codes related to transmission control
What to check
- Read freeze frame and pending codes; record transmission and engine data
- Visual inspection of transmission harness, connectors, and ground points
- Check transmission fluid level and condition (burnt smell, debris, contamination)
- Check for other related transmission codes (P07xx family, P0700)
- Back-probe the solenoid connector while commanding the solenoid with a bi-directional scan tool
- Measure solenoid coil resistance with an ohmmeter
Signal parameters
- Solenoid coil resistance: typically in a general range ~6–40 ohms (manufacturer-specific — consult factory data)
- Command voltage: near battery voltage (~11–14 V) when commanded ON (for DC-on solenoids)
- PWM/activation: many modern transmission solenoids are pulse-width modulated — frequency commonly 20–200 Hz and variable duty cycle
- Uncommanded/rest state: solenoid circuit should show expected baseline voltage or continuity per manufacturer spec
- PCM feedback: PCM usually infers hydraulic response from speed/pressure sensors rather than direct solenoid feedback
Diagnostic algorithm
- Verify the code and any related transmission codes with a scan tool; note freeze-frame data and DTC history.
- Visually inspect wiring and connectors to shift solenoid H for damage, corrosion, water intrusion, or loose pins.
- Check transmission fluid level and condition; if fluid is severely contaminated, consider service before further testing.
- With ignition ON (engine off), disconnect connector and measure solenoid coil resistance across the solenoid terminals; compare to factory spec (if no spec, compare to common range 6–40 ohms). Replace if open or shorted to ground/power.
- Reconnect and back-probe connector. Command solenoid ON/OFF using a bi-directional scan tool while observing voltage/ground and looking for correct change when commanded.
- If commanded signal present but solenoid does not energize, check continuity from solenoid connector to PCM to rule out wiring open/short. Wiggle harness while monitoring to reproduce intermittent fault.
- If commanded voltage is absent or PCM output is abnormal, test PCM driver output and grounds per factory procedures; consider PCM or wiring harness repair.
- If electrical tests pass but transmission behavior persists, inspect valve body and hydraulic circuit for stuck valves/debris; remove pan/filter and inspect internals if necessary.
- Replace the faulty solenoid or repair wiring as indicated. After repair, clear codes and perform road test with scan tool to confirm proper operation and no recurrence.
- If intermittent, perform extended road test and re-check connectors and harness routing for heat/chafing points. Use scope for detailed waveform analysis if needed.
Likely causes
- Damaged connector or pin corrosion at the solenoid connector
- Solenoid coil out of specification (open or low/high resistance)
- Broken or shorted wire between PCM and transmission harness
- Contaminated fluid or debris in valve body causing solenoid valve to stick
- PCM driver failure (less common)
Fault status
Status
Shift Solenoid H Circuit — electrical fault or incorrect response detected. Possible open/short, poor connection, failed solenoid, or hydraulic/valve-body issue. Further diagnosis required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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