OBD-II Fault Code

P1749: Pressure Control Solenoid Failed Low

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P1749.

System family

Powertrain

Manufacturer-specific

Repair category

Transmission / driveline

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What P1749 usually means

Pressure Control Solenoid Failed Low.

Common symptoms

Check Engine light; Poor drivability or reduced fuel economy depending on fault; Harsh shifting, limp mode, slipping or delayed engagement possible

Likely causes

Low/dirty transmission fluid; Solenoid/valve body issue; Wiring fault; Internal transmission wear; Low signal voltage; Weak power supply; High resistance/poor ground; Failed sensor

Diagnostic checks

Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Check transmission fluid level/condition using correct procedure; Scan TCM data and inspect connector/wiring; Check sensor reference voltage, ground and signal voltage

Repair guidance

Service/repair fluid or wiring issues first, test solenoid/valve body, seek transmission specialist for internal faults; Repair poor ground/power feed or replace confirmed faulty sensor

Verification after repair

Clear code, road-test through the same drive condition, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.