Code
P0750
HUMMER
P — Powertrain
Shift Solenoid A Malfunction
Views:
UK: 23
EN: 31
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in Shift Solenoid A circuit
- Poor or corroded connector or terminal at the solenoid
- Failed or stuck shift solenoid (coil or valve)
- Low, dark, or contaminated automatic transmission fluid (ATF)
- Faulty transmission control module (TCM) or PCM
- Internal valve body or hydraulic faults
Symptoms
- Check Engine / Transmission warning lamp illuminated
- Transmission may be stuck in one gear or limp (fail-safe) mode
- Delayed, harsh, or erratic upshifts and downshifts
- Vehicle may not shift into certain gears or may slip
- Possible transmission temperature increase or unusual noises
What to check
- Scan for stored codes and view freeze frame/live data with a capable scan tool
- Inspect transmission fluid level and condition (color, smell, debris)
- Visually inspect wiring harness and connector for damage, corrosion, or loose pins
- Backprobe solenoid connector and check for supply voltage and ground when commanded
- Measure solenoid coil resistance and compare to specification
- Command solenoid ON/OFF from scan tool and observe response (electrical and mechanical)
Signal parameters
- Solenoid coil resistance: typically varies by design (commonly ~6–45 ohms) — consult vehicle spec
- Supply voltage when solenoid commanded: near battery voltage (approx. 11–14 V) or switched ground depending on circuit
- PWM control: many modern transmissions use PWM to modulate solenoid (frequency and duty vary by design)
- Expected current draw: low amperage within solenoid specification; abnormally high or zero current indicates short/open
- No short to battery or ground when solenoid is not commanded
Diagnostic algorithm
- Retrieve all DTCs and freeze frame data; record any other transmission or engine codes.
- Check transmission fluid level and condition; correct level and replace if severely contaminated.
- Perform a visual inspection of wiring and connectors at the transmission and solenoid; repair any damage.
- With ignition ON (engine off), measure coil resistance at solenoid connector and compare to spec; look for open or short.
- Backprobe connector and command Shift Solenoid A ON/OFF using a scan tool; verify voltage/ground changes and measure current draw.
- If electrical tests are good but solenoid does not actuate, remove and bench-test the solenoid or perform valve body inspection for sticking valves.
- Repair or replace damaged wiring, connectors, or solenoid as indicated by tests. Replace valve body if hydraulic faults are confirmed.
- After repairs, clear codes, perform relearn procedures if required by the manufacturer, and road test to confirm normal shifting and that code does not return.
- If electrical and mechanical checks pass but code persists, evaluate TCM/PCM functionality and grounds; consider module reprogramming or replacement only after all other causes excluded.
Likely causes
- Damaged harness or connector to the solenoid
- Solenoid coil electrical failure (open or short)
- Contaminated fluid causing solenoid valve sticking
- Faulty ground or supply voltage to solenoid
- Worn or damaged valve body affecting hydraulic control
Fault status
Status
TCM detected abnormal response from Shift Solenoid A circuit (electrical or hydraulic malfunction) and stored DTC P0750.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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