OBD2 Code P0750: Shift Solenoid A Malfunction — shift solenoid A (SS1/S1) is not functioning correctly, preventing proper gear engagement
Reviewed by ASE Certified Mechanics · Last updated July 20, 2026
Quick Answer
P0750 = Shift Solenoid A Malfunction — shift solenoid A (SS1/S1) is not functioning correctly, preventing proper gear engagement
Severity: Check Soon · System: Transmission · ✅ Can continue with caution
The P0750 code means Shift Solenoid A Malfunction — shift solenoid A (SS1/S1) is not functioning correctly, preventing proper gear engagement. Estimated repair cost: $150 – $700.
📋 Diagnostic Reference
| OBD2 Code | P0750 |
| Category | Transmission |
| Severity | Check Soon |
| Repair Cost | $150 – $700 |
| Can You Drive? | Check |
🔍 Symptoms
- Transmission stuck in one gear (limp mode)
- Harsh or erratic shifting
- Check Engine Light on
- Transmission may default to 2nd or 3rd gear only
- Delayed or no upshifts
⚠️ Most Likely Causes (in order of probability)
- Shift solenoid A electrical failure — coil burned out or shorted
- Solenoid mechanically stuck from contaminated transmission fluid debris
- Wiring harness damage between TCM and transmission solenoid pack
- Corroded connector at the transmission case
- TCM driver circuit failure (rare)
🛠️ Diagnostic Procedure
Step 1: Check transmission fluid level and condition
Check transmission fluid level and condition
Step 2: Test shift solenoid A resistance — typical 12-25 ohms (varies by vehicle)
Test shift solenoid A resistance — typical 12-25 ohms (varies by vehicle)
Step 3: Apply 12V to solenoid A and listen for click — confirms mechanical operation
Apply 12V to solenoid A and listen for click — confirms mechanical operation
Step 4: Inspect wiring and connector between TCM and solenoid pack
Inspect wiring and connector between TCM and solenoid pack
Step 5: Monitor solenoid command vs actual state with scan tool during test drive
Monitor solenoid command vs actual state with scan tool during test drive
🔧 DIY Diagnosis: Step-by-Step
Follow this diagnostic flow for P0750 (Transmission Control System). Start at Step 1 and work your way down — the most likely fixes are listed first.
- Check transmission fluid level and condition — low or burnt fluid is the most common cause of transmission codes
- Scan for additional transmission-specific codes — P0700 is a generic code that simply means the TCM has a stored code
- Inspect the transmission range sensor connector and wiring — it's exposed to heat and road debris
- Check for transmission fluid leaks under the vehicle
- If fluid is clean and full, have a transmission shop perform a pressure test to check internal hydraulic function
📊 Common Causes & Repair Costs
For P0750, here are the most likely root causes ranked by how often mechanics see them, plus typical repair costs for each.
| Rank | Cause | Frequency | Typical Cost |
|---|---|---|---|
| #1 | Low or degraded transmission fluid |
30%
|
— |
| #2 | Faulty transmission range sensor |
22%
|
— |
| #3 | Transmission solenoid failure |
20%
|
— |
| #4 | Wiring or connector issue |
15%
|
— |
| #5 | Internal transmission mechanical failure |
13%
|
— |
Category Repair Cost Range (Transmission Control System)
| DIY / Best Case: | $100 |
| Independent Shop: | $600 |
| Dealer / Worst Case: | $3500 |
Costs include parts + labor. Actual price varies by make, model, and your location.
⚠️ Address Soon
Can you drive? Limited — The transmission may shift erratically or enter limp mode (stuck in one gear). Drive slowly and directly to a shop. Do not tow heavy loads or drive at highway speeds.
Estimated Repair Cost
Typical repair: $150–$700 (Parts + Labor) · Costs vary by make/model and location
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❓ Frequently Asked Questions
Can I drive with a P07xx transmission code?
Drive slowly and directly to a repair shop. The transmission may default to limp mode (stuck in 2nd or 3rd gear). Avoid highway driving and heavy acceleration. Continuing to drive with shifting problems can cause further damage.
How much does it cost to fix a P0700 code?
P0700 just means there's a transmission code — you need to read the TCM-specific codes to know the actual problem. Fluid change: $100–$250. Sensor replacement: $150–$400. Solenoid: $200–$600. Major repair: $1,500–$3,500.
Will a transmission fluid change fix P07xx codes?
If the fluid is low or degraded, a fluid change or top-off can resolve the issue. However, if the fluid is burnt or contains metal shavings, there may be internal damage that requires more extensive repair.
What does 'limp mode' mean?
Limp mode is a safety feature where the transmission locks into a single gear (usually 2nd or 3rd) to prevent further damage. You can drive slowly to a shop but shouldn't drive normally. The car will have very sluggish acceleration.
Can a P07xx code be caused by a bad battery?
Yes, low voltage can cause the TCM to set false codes. Transmission computers are sensitive to voltage drops. Always check the battery and charging system before assuming the transmission is failing.
🔗 Related OBD2 Codes
P0705 — Transmission Range Sensor Circuit Malfunction (PRNDL Input)
$150-$600
P0715 — Input/Turbine Speed Sensor Circuit Malfunction — transmission input speed sensor
$100-$500
P0730 — Incorrect Gear Ratio — TCM has detected that the actual gear ratio does not matc
$150-$3500
🔗 Related Codes by System
Codes with the same prefix or related system that may also be relevant: