P1705
Direct Clutch Speed Sensor Circuit Malfunction
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The P1705 code on Toyota vehicles indicates a malfunction in the direct clutch speed sensor circuit. This sensor, mounted on top of the transmission case, monitors the rotation speed of the direct clutch drum inside the automatic transmission. The ECM uses this speed signal, combined with the vehicle speed sensor signal, to precisely control shift timing and hydraulic pressure for smooth gear changes.
When this sensor fails or its circuit is disrupted, the ECM loses critical data about internal transmission operation. This typically results in harsh, delayed, or improper shifting, and in some cases, the transmission may enter a protective limp mode where it locks into a single gear to prevent damage. The code is set when the sensor reports less than 300 RPM while the vehicle is traveling above 20 MPH in 3rd or 4th gear — conditions where the drum should definitely be spinning.
The sensor itself is the most common point of failure and is relatively easy to replace since it's mounted externally on the transmission case. Before purchasing a new sensor, you can test the existing one with a multimeter — the resistance between its two terminals should be between 560 and 680 ohms. If it's out of range, the sensor is bad. Also inspect the wiring and connector for damage or contamination from transmission fluid leaks. This repair is moderately DIY-friendly if you're comfortable working underneath the vehicle.
Severity
Symptoms
- •Check Engine Light illuminated
- •Harsh or delayed transmission shifts
- •Transmission may get stuck in a single gear (limp mode)
- •Noticeable jolt or shudder when shifting gears
- •Reduced fuel economy due to improper shifting
- •Speedometer may behave erratically in some cases
Likely Causes
The speed sensor mounted on the transmission case that monitors the direct clutch drum rotation speed has failed internally. The sensor's resistance should measure between 560-680 ohms — values outside this range indicate a failed sensor.
The wiring harness between the direct clutch speed sensor and the ECM can develop opens, shorts, or high resistance from heat, vibration, or physical damage under the vehicle.
A poor electrical connection at the sensor plug can cause intermittent signal loss. Road salt, moisture, and transmission fluid leaks can corrode the connector pins.
The ECM circuit that processes the speed sensor signal can rarely fail, causing it to misinterpret valid sensor data.
In rare cases, internal transmission wear affecting the direct clutch drum can cause abnormal rotation speeds that the sensor accurately reports but fall outside expected parameters.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the direct clutch speed sensor
- Repair or replace damaged wiring in the sensor circuit
- Clean and secure the sensor connector
- Test sensor resistance (should be 560-680 ohms) and replace if out of spec
- Check for transmission fluid leaks contaminating the connector