P0750 Code: Shift Solenoid A Malfunction
The transmission computer sees a fault in shift solenoid A or its circuit and can't use it to shift.
At a glance
Severity: Moderate
- Meaning
- Shift Solenoid A Malfunction
- System
- Transmission · Powertrain
- Safe to drive?
- With caution
- Typical repair cost
- $120–$1,200
- DIY difficulty
- Moderate
Shift solenoids are small electric valves in the valve body that the transmission control module (TCM) switches on and off to steer fluid to the shift valves. "Solenoid A" is only a label, and what it does depends on the transmission: on Ford units it is SSA, on Toyota's older 4-speeds the No. 1 solenoid, and on Chrysler's 41TE, 62TE and RFE families the code is used for the low/reverse (LR) solenoid circuit. P0750 means the TCM's circuit monitor saw a voltage or current on that solenoid that doesn't match what it commanded – typically an open coil, a short, or a bad connection. Most transmissions respond by locking into a fixed failsafe gear so the vehicle can still be moved.
Can I keep driving? You can usually limp to a shop, but expect a single fixed gear, weak take-off and high rpm at speed. Avoid highway merging and long trips until the circuit is repaired.
How to read P0750
- P Powertrain
- 0 Generic (SAE)
- 7 Transmission
- 50 Specific fault
Symptoms
- Transmission stays in one gear (limp mode), often 2nd or 3rd depending on design
- No upshifts, or one or more gears missing
- Hard engagement when selecting Drive
- Sluggish take-off from a stop because the car starts in a higher gear
- Code comes back as soon as the key is turned on if the fault is a hard open or short
- Check engine light, sometimes a flashing O/D OFF or transmission warning light
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Shift solenoid A coil open or shorted internally
- Fluid wicking into the case connector, or corroded/bent pins
- Harness damage between TCM and transmission (chafing, heat, rodents)
- Internal harness or lead frame inside the pan damaged
- TCM solenoid driver failed
- Low system voltage or poor TCM ground
Diagnosis step by step
Read all TCM codes first
Use a scanner that talks to the TCM and note every code and its freeze frame. If solenoids A, B and C all set together, suspect their shared power feed or fuse rather than solenoid A itself.
Tools: OBD-II scanner
Unplug and inspect the case connector
Disconnect the harness at the transmission case and look for fluid inside the plug, green corrosion or pushed-back pins. Fluid in the harness side usually means the connector seal at the case has failed.
Tools: Flashlight, Screwdriver
Measure solenoid A resistance at the case
Measure between the solenoid A pin and its return pin, comparing with the factory spec (on/off shift solenoids are commonly somewhere around 10–40 ohms at room temperature). An open reading or a near-zero reading confirms a circuit fault inside the transmission; also check each pin to case ground, which should show no continuity.
Tools: Multimeter
Check the harness to the TCM
With the connector still off, check continuity of each wire from the case plug to the TCM plug and look for shorts to ground or voltage. Pay special attention where the harness passes near the exhaust or crossmember.
Tools: Multimeter, Flashlight
Command the solenoid with a scan tool
If the wiring checks out, use the scan tool's output test to switch solenoid A while back-probing power and control wires. You should see battery voltage on the feed and the control side pulled low when commanded on; no switching points to the TCM.
Tools: OBD-II scanner, Multimeter
Go inside only after outside tests
If the fault is confirmed inside the case, drop the pan and measure directly at the solenoid to separate a bad solenoid from a damaged internal harness. Replace the filter and refill with the exact specified fluid afterward.
Tools: Towels & shallow pan, Torque wrench
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Repair harness or replace case connector | No | $120–$400 |
| Replace shift solenoid A (pan removal) | No | $250–$650 |
| Replace solenoid pack / solenoid body | No | $450–$1,000 |
| Replace internal harness or lead frame | No | $300–$800 |
| Replace and program TCM | No | $500–$1,200 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Notes by brand
Ford
On Ford 5R55-family automatics (Explorer, Ranger, Mustang V6 of that era), the shift solenoids sit in one solenoid body. An SSA circuit fault is usually fixed by replacing the complete solenoid body, and the case connector seal should be checked for leaks at the same time.
Dodge
On Dodge minivans and crossovers with the 41TE or 62TE, P0750 points to the low/reverse solenoid circuit. The solenoid and pressure switch assembly bolts to the outside of the case, so testing and replacement don't require dropping the pan.
Chevrolet
GM trucks with the 4L60E usually log a 1-2 shift solenoid wiring fault as P0753 rather than P0750. If P0750 shows up on a GM product, check the service information to confirm which solenoid it refers to.
Field data
| Kia | 2 | Spectra |
|---|
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.
Emissions / smog test impact
Will fail
P0750 turns on the check engine light, which fails an OBD emissions or smog inspection. After the repair, drive normally for a few days so the readiness monitors complete before retesting.
Frequently asked questions
Which gear does the transmission stay in with P0750?
It depends on the design. Many 4-speed automatics fall back to 2nd or 3rd so the car can still move and reach moderate speed; Chrysler's front-drive units default to 2nd. Reverse and Park normally still work.
Is P0750 always a bad solenoid?
No. A large share of cases are connectors with fluid or corrosion in them, or damaged wiring. A resistance test at the case connector tells you quickly whether the problem is inside or outside the transmission.
What is the difference between P0750 and P0753?
Both flag an electrical problem with solenoid A. Some makers, like Ford and Chrysler, use P0750 for it, while others, like GM and Honda, use P0753 – the test procedure is essentially the same.
Can I clear the code and keep driving?
You can clear it, but a hard electrical fault returns immediately and the transmission goes back into limp mode. Driving for weeks in a single gear adds heat and wear, so have it fixed soon.