P0725 on Infiniti
Engine Speed Input Circuit Malfunction
P0725 on Infiniti vehicles indicates engine speed input circuit malfunction. Au7o has documented this code across 2 Infiniti models — most commonly on FX35, M35. This generic powertrain code means the transmission control module or PCM is not receiving a reliable, rational engine-speed (or input/turbine) signal from its speed sensor. The computer compares this rotational-speed input against other sensors to manage shift timing and torque converter lockup, and it sets the code when that signal goes missing, drops out, or reads illogically. It usually points to a sensor or wiring problem in the speed-input circuit rather than an engine failure itself. Typical repair costs on Infiniti range from $150 to $450, depending on the specific model and root cause.
Common Causes of P0725
- •Faulty engine/input speed sensor
- •Damaged, corroded, or loose sensor wiring or connector
- •Low or dirty transmission fluid
- •Open or shorted circuit between sensor and PCM/TCM
- •Poor ground or power supply to the sensor
- •Internal transmission damage affecting the sensor
- •Faulty PCM/TCM (rare)
P0725 on Infiniti by Model
Infiniti FX35(1 issue)
- Camshaft / Crankshaft Position Sensor Failure2003-2012
The FX35 commonly develops intermittent failures of the camshaft position sensors and sometimes the crankshaft position sensor, causing stalling, hard starts, or limp operation. Heat and age degrade the sensor electronics, and this issue is widely reported across Nissan/Infiniti VQ applications of the era.
Infiniti M35(1 issue)
- Camshaft and Crankshaft Position Sensor Failure2006-2010
The VQ35DE engine used in the M35 is known for intermittent camshaft and crankshaft position sensor failures. Heat and age can cause the sensors to send erratic signals, leading to hard starting, stalling, limp mode, or a check engine light.
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View P0725 across all makes →Frequently Asked Questions
What does P0725 mean on Infiniti?▼
P0725 stands for "Engine Speed Input Circuit Malfunction." This generic powertrain code means the transmission control module or PCM is not receiving a reliable, rational engine-speed (or input/turbine) signal from its speed sensor. The computer compares this rotational-speed input against other sensors to manage shift timing and torque converter lockup, and it sets the code when that signal goes missing, drops out, or reads illogically. It usually points to a sensor or wiring problem in the speed-input circuit rather than an engine failure itself. On Infiniti specifically, this code is documented across 2 models.
What causes P0725 on Infiniti vehicles?▼
Common causes on Infiniti: Faulty engine/input speed sensor, Damaged, corroded, or loose sensor wiring or connector, Low or dirty transmission fluid, Open or shorted circuit between sensor and PCM/TCM, Poor ground or power supply to the sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0725 on a Infiniti?▼
Repair costs on Infiniti range from $150 to $450, depending on the specific model and root cause.
Which Infiniti models have P0725 documented?▼
Au7o has documented P0725 on 2 Infiniti models: FX35, M35.