OBD-II trouble code
P0750: Shift Solenoid A Malfunction
An electrical or hydraulic fault has been detected in shift solenoid A, the solenoid that controls one of the lower gear shifts on most automatic transmissions.
Quick facts
- System
- Powertrain
- Category
- Transmission / Shift Control
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $250 – $700
- DIY difficulty
- Advanced DIY
What does P0750 mean?
P0750 sets when the powertrain control module detects that shift solenoid A isn't responding the way it should. The 'A' designation maps to a specific solenoid on your transmission — usually the one responsible for the 1-2 shift or one of the other low-gear transitions, depending on the manufacturer. The PCM monitors each solenoid's circuit electrically (looking for the right resistance and current draw when the coil is energized) and watches the resulting hydraulic behavior (checking that the actual gear ratio matches what was commanded). When either check fails, P0750 lands in memory.
Most P0750 failures are electrical at the solenoid coil — the windings open or short internally after years of heat cycling inside the transmission. The next most common cause is a connector problem, often where the transmission's external pass-through connector has been disturbed during other work. Hydraulic causes — sticking valve body bores, low line pressure, or contaminated fluid blocking the solenoid's tiny passages — round out the failure modes.
Drivers typically notice harsh shifts, missing shifts, or in serious cases the transmission going into limp mode and holding a single gear (usually second or third) to protect itself. Limp mode driving feels like driving with no overdrive — the car will move and steer normally but the engine will rev high at any meaningful speed. Even when limp mode isn't triggered, P0750 should be addressed quickly because the underlying problem usually gets worse, not better.
Common causes
- Open or shorted shift solenoid A coil
- Damaged or corroded transmission external connector pins
- Wiring damage between the PCM and the solenoid
- Valve body wear or stuck solenoid bore
- Contaminated or burnt transmission fluid blocking the solenoid passage
- Low transmission fluid level from a leak
- Failed PCM driver circuit (rare)
- Aftermarket transmission cooler installation that introduced a connector issue
Symptoms
- Check engine light on with P0750 stored
- Harsh, delayed, or missed shifts — usually the 1-2 shift
- Transmission stuck in a single gear (limp mode)
- Engine revs high at moderate road speeds when limp mode is active
- Transmission won't downshift when expected
- Slipping feeling between gears
- Slight burnt smell from old or overheated fluid
Diagnostic steps
- 1.Scan for any companion transmission codes — P0750 rarely appears alone, and the full picture usually reveals which subsystem failed first.
- 2.Inspect the transmission's external connector for corrosion, bent pins, or a pushed-back terminal.
- 3.Resistance-check the solenoid through the external connector against the manufacturer's spec — most read 10-30 ohms.
- 4.Pull the pan and inspect for excessive metal debris in the fluid, which would indicate broader transmission damage.
- 5.Check fluid condition and level — burnt or low fluid invalidates any further electrical testing.
- 6.If the solenoid checks out electrically but the symptom persists, the next step is a valve body inspection or rebuild.
Repair cost
$250 – $700
Shift solenoid replacement is typically $250-$500 when the solenoid is accessible after dropping the pan. Cost climbs to $400-$700 on transmissions where the solenoid is integrated into a valve body assembly that must be replaced as a unit. A full valve body replacement runs $600-$1,500, and a complete transmission rebuild — if internal damage is present — is $2,500-$4,000.
Estimate your repair
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Open the Repair Cost Estimator with transmission shift solenoid replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.