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P0750 — Shift Solenoid A Malfunction

P0750 is set when the TCM detects that shift solenoid A is not responding to commands — either the circuit is electrically open or shorted, or the solenoid is mechanically stuck. Shift solenoid A controls one of the hydraulic shift paths inside the valve body; depending on the transmission, "A" may control specific shifts (1-2 or 2-3) or be paired with another solenoid for upshift logic. Without a working solenoid A, the transmission cannot make those shifts and typically enters limp mode.

P0750 means shift solenoid a malfunction. A vehicle usually stays drivable short-term with this code, but it should be diagnosed promptly. The most common cause is failed shift solenoid a (electrical or mechanical) (typically $250–$900). Causes and cost vary by make and model; confirm the root cause before replacing parts.

Severity: high powertrain Safe to drive (short term)

Reviewed by MECH AI Editorial · Last verified

What does P0750 mean?

P0750 is set when the TCM detects that shift solenoid A is not responding to commands — either the circuit is electrically open or shorted, or the solenoid is mechanically stuck. Shift solenoid A controls one of the hydraulic shift paths inside the valve body; depending on the transmission, "A" may control specific shifts (1-2 or 2-3) or be paired with another solenoid for upshift logic. Without a working solenoid A, the transmission cannot make those shifts and typically enters limp mode.

What are the symptoms of P0750?

What causes P0750?

Cause Likelihood Estimated repair (USD)
Failed shift solenoid A (electrical or mechanical) Most common $250–$900
Damaged solenoid wiring or external transmission connector Common $100–$500
Contaminated transmission fluid causing valve sticking Common $150–$500
Worn or stuck valve body causing the solenoid to lose pressure regulation Occasional $600–$2,000
Failed TCM driver for the solenoid circuit Rare $500–$1,500
Internal transmission damage (rare for P0750 alone) Rare $2,500–$6,500

Repair costs are typical US ranges and vary by make, model, model year, and labor rate. A diagnostic trouble code is a symptom, not a guaranteed failed part — confirm the root cause before replacing anything.

Is it safe to drive with P0750?

In most cases a vehicle stays drivable for short trips with P0750 active, but you should diagnose and repair it promptly. This is a high-severity code — ignoring it can lead to further damage or a failed emissions test. Exact tolerance depends on your specific make and model.

How to diagnose P0750

  1. Check fluid level and condition

    Always start a transmission diagnosis with fluid. Most modern transmissions require a specific procedure to check level — typically warm, level surface, engine running, selector in park. Burnt-smelling or dark fluid means clutch material in circulation; fix the underlying issue, not just the solenoid.

    Tools: Vehicle-specific service procedure, Replacement fluid if needed

  2. Pull all transmission codes from the TCM

    P0750 alone is one repair scope. P0750 with P0731-P0734 (ratio incorrect) or P0741 (TCC stuck off) means broader transmission issues that may not resolve with a solenoid replacement alone.

    Tools: Scan tool with TCM access

  3. Test shift solenoid A electrically

    Disconnect the external transmission connector. Find the solenoid A pin in the wiring diagram and measure resistance — typically 10–30 Ω. Infinite or near-zero means a failed solenoid. Confirm the TCM is commanding voltage during a shift attempt by back-probing while driving.

    Tools: Multimeter, Wiring diagram, Back-probe pins

  4. Inspect the connector for fluid contamination

    A failing case seal allows transmission fluid to wick up the external wiring harness, contaminating the connector. Look for fluid inside the connector or up the harness. If found, repair the seal AND likely replace the contaminated harness section — fluid in the connector creates intermittent faults that can mimic solenoid failure.

    Tools: Connector unlock tool, Flashlight

  5. Drop the pan and inspect for clutch material

    Brown or gritty paste on the pan magnet indicates clutch slippage somewhere in the transmission. If the solenoid is bad, that's one repair; if the pan also shows clutch material, the transmission has bigger problems and a solenoid replacement is just a stopgap.

    Tools: Drain pan, New filter and gasket, Common hand tools

How do I fix P0750?

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P0750: frequently asked questions

What does diagnostic trouble code P0750 mean?

P0750 is set when the TCM detects that shift solenoid A is not responding to commands — either the circuit is electrically open or shorted, or the solenoid is mechanically stuck. Shift solenoid A controls one of the hydraulic shift paths inside the valve body; depending on the transmission, "A" may control specific shifts (1-2 or 2-3) or be paired with another solenoid for upshift logic. Without a working solenoid A, the transmission cannot make those shifts and typically enters limp mode.

What are the symptoms of P0750?

Check Engine Light is illuminated. Transmission stuck in a single gear or limited gear range. Hard, harsh, or absent upshifts. Possible no movement in drive (if solenoid is critical to initial gear engagement). Engine RPM unusually high at cruise (no upshift completing). Reduced fuel economy. Often paired with P0700 (transmission control malfunction)

What causes P0750?

Failed shift solenoid A (electrical or mechanical) (most-common). Damaged solenoid wiring or external transmission connector (common). Contaminated transmission fluid causing valve sticking (common). Worn or stuck valve body causing the solenoid to lose pressure regulation (occasional). Failed TCM driver for the solenoid circuit (rare). Internal transmission damage (rare for P0750 alone) (rare)

Is it safe to drive with P0750?

In most cases a vehicle stays drivable for short trips with P0750 active, but it should be diagnosed and repaired promptly — this is a high-severity code. Ignoring it can lead to further damage or a failed emissions test. Specific tolerance varies by make and model.