P1715

Input Speed Sensor (TCM)

Car Fault Codes Nissan Transmission

Can you still drive? With care, short trips only

Who can fix it? Needs a workshop

Typical repair time 30 minutes – 3 hours

Typical cost SAR 150 to 2,500

What it means

This is a Nissan-specific code; the same number can mean something different on other makes. It is usually stored in the engine computer (ECM) when the transmission input speed information it receives from the transmission control module (TCM) is implausible or missing. In many cases it reflects a fault already stored in the TCM, so diagnosis starts with the TCM codes.

Models covered: Nissan automatic/CVT models, mainly around 2000–2012.

Symptoms4

Check engine light on.
Harsh or late shifts, or uneven ratio changes on a CVT.
The transmission may enter fail-safe mode in some cases.
The driver may notice nothing if the fault is intermittent.

Possible causes5

A faulty input speed sensor (turbine or primary pulley speed sensor) in the transmission.
A damaged connector or wire in the sensor circuit.
A CAN communication fault between the TCM and the ECM.
Metal debris on the sensor spoiling its signal.
A faulty TCM (less common).

How to diagnose5

Read codes from both the TCM and ECM, and fix TCM codes such as P0715 first.
Check for communication codes such as U1000 that point to a CAN network fault.
Watch input speed on a scan tool while driving and compare it with engine speed and output speed.
Inspect the sensor connector and wiring, and compare the sensor's resistance or signal with the manufacturer specification.
Check the transmission fluid for metal debris.

How to fix5

Repair the damaged connector or wire in the sensor circuit.
Repair any CAN network fault.
Clean debris from the sensor or replace it if confirmed faulty.
Replace and program the TCM if confirmed faulty.
Clear codes from both modules and road test.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low when a connector or wire is the cause, and rises if the sensor requires removing transmission parts to reach, or if a new TCM is needed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Why is the code in the engine computer, not the transmission module?

The ECM receives input speed data from the TCM and stores the code when it is implausible. The TCM usually holds a matching code that pinpoints the cause.

Should I replace the sensor right away?

No. First check the TCM codes, the wiring and the CAN network, because replacing the sensor without confirmation may not fix the problem.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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