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P0750 is a shift solenoid A fault - the transmission cannot shift correctly without it. On many vehicles the solenoids come as a pack and must be replaced together. Before ordering parts, resistance-test the solenoid from outside the trans - a simple wiring check takes 10 minutes. Contaminated fluid is a common solenoid killer on higher-mileage vehicles. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0750 shift solenoid A fault located in the transmission valve body
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0750 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Failed Shift Solenoid A
Shift solenoid A controls hydraulic pressure routing to apply specific gear clutches. When the solenoid coil burns out (open circuit) or shorts internally, the TCM receives no feedback that the solenoid responded. P0750 sets and the transmission may be stuck in a gear or unable to shift. Solenoid replacement - often as part of a solenoid pack - is the most common repair. On many Honda/Toyota transmissions, solenoid A is a standalone part.
🔩 Part
$30–$200
👨🔧 Labor
$150–$350
⚡ DIY Difficulty
Moderate
25%
#2 - Check First
Wiring or Connector Fault
The wiring between the TCM and solenoid A runs through the transmission harness and an external connector. Corrosion in the connector, a broken wire, or a chafed wire shorting to ground prevents the solenoid from receiving the control signal. This is the first thing to check - visually inspect the harness and measure voltage/resistance at the connector before dropping the pan.
🔩 Part
$10–$60 (wire/connector)
👨🔧 Labor
$60–$180
⚡ DIY Difficulty
Easy–Moderate
12%
#3 - Less Common
Valve Body Restriction (Spool Valve Sticking)
Even with a functional solenoid, varnish deposits can cause the spool valve the solenoid controls to stick mechanically. The solenoid fires correctly but the valve doesn't move, producing no pressure change. A transmission fluid and filter service with fresh OEM fluid resolves varnish-related sticking in some cases. If fluid service doesn't help, valve body cleaning or replacement is needed.
🔩 Part
$100–$400 (valve body)
👨🔧 Labor
$200–$500
⚡ DIY Difficulty
Hard
8%
#4 -
Fluid Contamination
Metal particles and varnish in degraded fluid clog the solenoid orifice, preventing it from operating. Solenoids have very small internal passages that plug easily when fluid breaks down. On high-mileage vehicles that have never had a fluid service, a fluid change is worth performing before any parts replacement - it resolves a portion of P0750 cases and should be part of any transmission repair anyway.
🔩 Part
$30–$100 (fluid/filter)
👨🔧 Labor
$80–$200
⚡ DIY Difficulty
Easy–Moderate
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check Fluid Level and Condition - Inspect the transmission fluid. Dark or burnt-smelling fluid means it needs to be serviced. Low fluid indicates a leak. Perform a fluid and filter service before any other repairs - this resolves a percentage of P0750 cases caused by contaminated solenoids.
- Inspect the Transmission Wiring Harness and Connector - With ignition off, disconnect the transmission external harness connector. Look for corrosion, bent pins, and damaged wires. Use a DVOM to check for continuity between the TCM harness and solenoid A terminals. Resistance should be near zero - an open indicates a broken wire.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need