Worn or dirty throttle position sensor causing a dead spot or erratic voltage output; Damaged or corroded wiring and connectors between the TPS and the TCM; Poor electrical ground at the throttle body or engine block affecting sensor reference voltage; Failed TCM or a software calibration issue misinterpreting a valid TPS signal; Contaminated throttle body or sticking throttle plate altering the sensor's mechanical sweep; Aftermarket throttle body or sensor with incorrect resistance characteristics

DTC codes / Nissan codes / P1705

P1705 · NissanThrottle Position Sensor Circuit AT

Q: What does code P1705 mean?

Throttle Position Sensor Circuit AT. P1705 on Nissan vehicles means the Transmission Control Module (TCM) has detected an abnormal signal from the throttle position sensor (TPS) circuit that it uses to manage shift timing and pressure. The TCM compares the TPS voltage against expected values and sets this code when the signal is out of range, intermittent, or implausible for the current driving conditions.

P1705 on Nissan vehicles means the Transmission Control Module (TCM) has detected an abnormal signal from the throttle position sensor (TPS) circuit that it uses to manage shift timing and pressure. The TCM compares the TPS voltage against expected values and sets this code when the signal is out of range, intermittent, or implausible for the current driving conditions.

SystemPowertrain

Code typeNissan specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

Harsh or delayed automatic transmission shifts, especially when accelerating from a stop
Transmission stuck in a single gear or failing to downshift during kickdown
Erratic or hunting shift patterns that change without driver input
Reduced engine power or limp-home mode with the malfunction indicator light illuminated
Often no symptoms besides the warning light, particularly if the fault is intermittent

Common causes, most likely first

Worn or dirty throttle position sensor causing a dead spot or erratic voltage output
Damaged or corroded wiring and connectors between the TPS and the TCM
Poor electrical ground at the throttle body or engine block affecting sensor reference voltage
Failed TCM or a software calibration issue misinterpreting a valid TPS signal
Contaminated throttle body or sticking throttle plate altering the sensor's mechanical sweep
Aftermarket throttle body or sensor with incorrect resistance characteristics

How to diagnose and fix it

Connect a scan tool and record live TPS voltage through the full pedal travel to confirm a smooth sweep with no dropouts
Inspect the TPS connector and harness for corrosion, chafing, or pushed-back pins, and clean or repair as needed
Measure reference voltage and ground at the TPS connector with a multimeter to rule out supply-side faults
Check and clean the throttle body and plate, then perform a throttle position relearn if the vehicle supports it
Back-probe the TPS signal wire at the TCM and compare it with the sensor output to isolate a wiring fault
Replace the throttle position sensor or throttle body assembly if the signal is proven faulty
Clear the code and road-test through several drive cycles to confirm the repair and verify no pending return

Why P1705 is often a wiring fault

A common misdiagnosis is replacing the TCM when the real problem is a chafed TPS signal wire near the throttle body or a corroded ground that shifts the reference voltage.
Intermittent P1705 codes often appear only on rough roads or after engine bay heat soak, so a static multimeter test at idle can pass while the fault is still present.
A dirty throttle body can cause the TPS to report a slightly different closed-throttle voltage, and the TCM may flag P1705 without any sensor failure at all.
Some Nissan models require a throttle position relearn after battery replacement or throttle body cleaning, and skipping it can set P1705 immediately after an otherwise correct repair.
P1705 does not always mean the transmission itself is failing; the TCM uses TPS input for shift pressure, so a sensor fault can mimic internal transmission problems.

Can I keep driving with P1705?

You can usually drive the vehicle to a workshop, but expect harsh shifts and possible limp-home mode; avoid heavy acceleration, towing, or long trips until the fault is diagnosed because erratic TPS input can cause unsafe shift behavior.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.