P0749
Pressure Control Solenoid Electrical
Powertrain Transmission Control Solenoid Electrical 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The transmission's pressure control solenoid has an electrical problem—either a wiring issue, bad connection, or faulty solenoid itself. Think of it like a broken switch that can't properly control fluid pressure in your transmission.

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Symptoms You May Notice
3 known symptoms for this code
Transmission shifting harshly or delayed shifts
Check engine light illuminated
Transmission stuck in limp mode or reduced power
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors the pressure control solenoid's electrical circuit for voltage, current draw, and proper activation signals. It detects open circuits, short circuits, or resistance values outside expected ranges when commanding the solenoid to modulate transmission fluid pressure.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Coil Resistance 4-12 ohms (varies by solenoid type) Open circuit (infinite) or short (<2 ohms)
Circuit Voltage 12-14V when solenoid energized <3V or excessive voltage drop
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wire connectors and harness
Inspect and reseat the solenoid electrical connector; clean corrosion with contact cleaner.
2
Wiring harness
Check for damaged, pinched, or exposed wires in the transmission control circuit and repair or replace as needed.
3
Pressure control solenoid assembly
Replace the solenoid if resistance is out of spec or circuit tests show internal failure.