Shift Solenoid A Stuck On
The Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected that transmission shift solenoid 'A' is stuck in the 'on' position. This is typically determined when the transmission fails to achieve the expected gear ratio based on vehicle speed, engine load, and throttle position.
This code requires immediate attention because driving with a stuck shift solenoid can cause severe internal transmission damage. The vehicle may also enter a restricted 'limp mode', making it unsafe for highway driving.
Common symptoms
- Illuminated Check Engine Light
- Transmission fails to shift into or out of certain gears
- Vehicle enters 'limp mode' and is restricted to a single gear
- Harsh, erratic, or delayed shifting
- Decreased fuel economy due to incorrect gear engagement
Likely causes
- Dirty, degraded, or contaminated transmission fluid
- Defective or mechanically stuck shift solenoid A
- Clogged transmission fluid filter or blocked hydraulic passages in the valve body
- Damaged, shorted, or corroded wiring and connectors in the transmission circuit
- Internal mechanical transmission failure
- Faulty Transmission Control Module (TCM) or PCM (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Low fluid levels, a burnt smell, or heavy metallic debris indicating fluid degradation or internal transmission wear.
Scan all modules for additional diagnostic trouble codes.
Look for: Other gear ratio, pressure, or solenoid codes that might indicate a broader hydraulic or electrical system failure.
Visually inspect the transmission wiring harness and connectors.
Look for: Frayed wires, melted insulation, or corroded pins that could cause a short circuit keeping the solenoid energized.
Test the electrical resistance of shift solenoid A using a digital multimeter.
Look for: Resistance values that fall outside of the manufacturer's specified range, indicating an internal electrical fault in the solenoid.
Perform a bidirectional scan tool test or apply direct voltage to the solenoid to check mechanical operation.
Look for: A lack of an audible 'click' when the solenoid is commanded on and off, confirming it is mechanically stuck.
This page explains the generic P0752 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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