P0750 Code: Shift Solenoid A Malfunction
Last reviewed May 2026 · Reviewed by the Find This Code Editorial Team
Quick Answer
Shift Solenoid A in the transmission isn't functioning correctly, which can cause incorrect or missed gear shifts.
At a Glance
What this code means
Automatic transmissions use solenoids to control hydraulic fluid routing and thereby control gear changes. Shift Solenoid A is responsible for specific gear transitions (which transitions depends on the vehicle). P0750 means the TCM detected a malfunction in Shift Solenoid A — either an electrical fault or a performance issue where the solenoid isn't producing the expected gear change.
Common causes
- Failed or stuck Shift Solenoid A
- Low or degraded transmission fluid (clogs solenoid passages)
- Damaged wiring or connector to Shift Solenoid A
- Clogged transmission filter
- Failed TCM
Symptoms you might notice
- Check engine light on
- Transmission stuck in one gear (limp mode)
- Harsh or missed gear shifts
- Transmission slipping
- Delayed engagement from Park to Drive
Can you still drive?
With caution for short distances only. Limp mode limits speed and RPM. Avoid highway driving.
How serious is this code?
High. A stuck solenoid can prevent proper gear shifts. Driving in this condition can damage the transmission.
Before you replace parts
Parts replacement is often not the first step. Before buying anything, it's worth checking these basics:
- Change the transmission fluid and filter before replacing the solenoid — old fluid contains debris that clogs solenoid screens, and a clean fluid change often resolves the code
- Check for TSBs on your vehicle for Shift Solenoid A — some vehicles have known issues with updated solenoid designs or fluid specifications
How to troubleshoot it
- Check transmission fluid level and condition first
- Change the transmission fluid and filter — contaminated fluid is a common solenoid killer
- Test Shift Solenoid A resistance with a multimeter and compare to spec
- Check the wiring harness to the solenoid for damage
- If the solenoid and wiring check out, consult a transmission specialist
Common mistakes to avoid
These are the most frequent diagnostic errors when dealing with P0750. Avoiding them can save time and money.
- Replacing the shift solenoid without testing it for resistance and proper operation first
- Not checking the transmission fluid for condition — dirty or degraded fluid clogs solenoid passages and causes shift solenoid codes
- Ignoring the transmission control module wiring and connector for the affected solenoid
- Attempting shift solenoid repairs without draining the transmission fluid and using a clean pan gasket
Tools that may help
These are the types of tools commonly used when diagnosing this code. Having the right tool can save time and help confirm a diagnosis before spending money on parts.
- Advanced OBD-II scanner (TCM capable)
- Multimeter
- Transmission fluid dipstick
Estimated repair cost range
Transmission fluid service: $100–$250. Shift solenoid replacement: $100–$300+ depending on accessibility. Transmission rebuild (worst case): $1,500–$4,000.
Costs vary significantly by vehicle, location, and whether you use OEM or aftermarket parts. These are general ranges for reference only.
When to call a mechanic
If you've completed the basic troubleshooting steps and the code keeps returning, or if you don't have access to the proper diagnostic tools, it's worth consulting a professional. A qualified technician can perform a full diagnosis and confirm the root cause before any parts are purchased. When in doubt, get a professional opinion — it can save you from an expensive misdiagnosis.
Real-world note
Transmission solenoid faults are often related to fluid maintenance neglect. If the transmission fluid has never been changed (or hasn't been changed in many years), a fluid service is always the first step — it resolves a significant portion of solenoid codes without any parts replacement.
Learn more
How we write these guides
Find This Code guides are written based on OBD-II specification documentation, established automotive diagnostic practices, and real-world patterns observed across vehicle makes and models. Content is reviewed for accuracy and plain-English clarity before publication. Pages are marked with a “Last reviewed” date and updated when diagnostic guidance or code interpretation changes. All content is educational — it is not a substitute for hands-on diagnosis by a qualified mechanic.
Last reviewed May 2026 · Find This Code Editorial Team · Editorial standards →
Sources & references
Our guides are written based on OBD-II specifications, automotive engineering principles, and established diagnostic best practices. Key reference sources include:
- U.S. EPA — On-Board Diagnostics (OBD)Official EPA documentation on OBD-II standards and emissions monitoring requirements for passenger vehicles.
- ASE — Automotive Service ExcellenceIndustry certification body for automotive technicians; sets best-practice diagnostic and repair standards.
- NHTSA — Vehicle Safety & RecallsCheck whether your transmission issue is covered by an open safety recall or technical service bulletin.
Informational purposes only. This guide is for educational reference and is not a substitute for diagnosis by a qualified technician. Repair costs, causes, and symptoms may vary by vehicle make, model, year, and condition. Always consult a licensed mechanic before performing major repairs.