What does it mean?
P1754 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Coast Clutch Solenoid Circuit Malfunction .
Symptoms
- MIL (check engine lamp) on with a transmission warning lamp
- Little or no engine braking when lifting off the pedal
- Harsh or slipping shifts in the higher gears
- Limp mode with a reduced number of available gears
- Engine RPM flares on deceleration or during a downshift
Likely causes
- Open or shorted coast clutch solenoid winding
- Short to ground or short to battery on the solenoid drive wire
- Corroded or ATF filled case connector with damaged terminals
- Chafed internal harness rubbing against the valve body or pan rail
- High resistance joint or a broken wire between the module and the solenoid
- Blown fuse or an interrupted supply feeding the solenoid pack
- Module output driver failure, tested last in the diagnostic sequence
How to fix it
- Check the transmission fuse, system voltage and fluid level before circuit testing
- Measure coast clutch solenoid resistance at the case connector and compare with specification
- With the solenoid unplugged, test the drive circuit for continuity, short to ground and short to battery
- Command the solenoid with a scan tool and listen or watch for a hydraulic response
- Check insulation between the solenoid terminal and the transmission case
- Inspect the internal harness and case connector for fluid soaking and chafing
- Replace the solenoid or repair the wiring, then confirm engine braking returns on a road test