Problem in Torque Converter Clutch Solenoid Valve ‘B’ Circuit
Table of contents
P1758 ISUZU Possible Causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Torque Converter Clutch Solenoid
- Torque Converter Clutch Solenoid harness is open or shorted
- Torque Converter Clutch Solenoid circuit poor electrical connection
How do I fix code P1758 ISUZU?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1758 ISUZU code
The cost of diagnosing the P1758 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission will not shift gears.
P1758 ISUZU Description
The torque converter clutch solenoid valve switches the hydraulic circuit to engage/disengage the torque converter clutch. When the torque converter clutch solenoid valve is turned ON, hydraulic pressure is applied to the torque converter clutch. When the torque converter clutch solenoid valve is turned OFF, hydraulic pressure to the torque converter clutch is interrupted.
The powertrain control module (PCM) controls the torque converter clutch solenoid valve. The driver circuit has a diagnostic function that detects and outputs the state of a short or open circuit, and sends a return signal to the PCM. If the return signal during the PCM’s command is not appropriate, the PCM detects a malfunction and stores a DTC.