P0752: Shift Solenoid A Stuck On

A shift solenoid is an electrically switched valve in the valve body; together the solenoid states select the gear, and the module checks the result by gear ratio, slip or a pressure switch – the pattern of wrong gears shows which solenoid hangs off or on. P0752 means solenoid A is commanded off but its clutch stays applied. GM's 6T70 flags slip of 400 rpm for 2 s five times after one trip and then runs only reverse, first and third with maximum pressure; GM's T43 a ratio of 3.83–4.23 (first instead of fourth); GM 4-speeds the pattern 1-1-4-4 after two trips; Allison its pressure switch after 2 s. Ford calls it 'functionally failed on'. A clutch that does not release can tie up the transmission.

Symptoms

• Wrong, often too low gear, engine revs high
• Tie-up or jolt on shifts
• Limp mode (GM: reverse, 1st, 3rd only)
• Check engine light

Most likely causes

• Shift spool sticking in the applied position
• Solenoid stuck open or leaking
• Clutch not releasing (burnt or stuck)
• Contaminated or wrong fluid

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition according to the manufacturer
2. Use the scanner to command the movement and compare the actual position with the requested one.
3. Check the transmission connector
4. Read the data with a transmission-compatible scanner
5. Measure the solenoid valve circuit
6. Leave opening the transmission to a specialized repair shop

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P0752 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 7: Transmission
• 52: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0752?

Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.

What causes code P0752?

The most common causes are: shift spool sticking in the applied position; solenoid stuck open or leaking; clutch not releasing (burnt or stuck).

Related codes

• P0751Shift Solenoid A Performance/Stuck Off
• P0750Shift Solenoid A
• P0753Shift Solenoid A Electrical
• P0974Shift Solenoid A Control Circuit High
• P0731Gear 1 Incorrect Ratio
• P0734Gear 4 Incorrect Ratio

Sources

• saabwisonline.com: dtc p0751 or p0752
• gsi.ext.gm.com: 19OBDG03C Diagnostics
• gsi.ext.gm.com: 07 GRP15 Allison 1000
• gsi.ext.gm.com: 2006trans5 a

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.