P0725 on Nissan: How to Diagnose & Fix
Engine Speed Input Circuit Malfunction
1 Nissan model · 1 documented issue · $150-$600 repair
P0725 on Nissan by model: symptoms, diagnosis and fix
Altimas in this period frequently suffer from failing crankshaft position sensors and camshaft position sensors, especially on the 2.5L and 3.5L engines. Owners report intermittent stalling at stops or while driving, extended cranking, sudden no-start conditions, and check-engine lights. Nissan issued service information and many owner reports describe repeat failures with cheap aftermarket sensors.
Common Symptoms
- engine stalls while driving
- intermittent no-start
- long crank time
- tachometer drops to zero
- check engine light
- hard restart when hot
How to Fix
Diagnosis includes scanning for correlation and sensor circuit codes, checking live RPM signal during cranking, and inspecting harness connectors for oil contamination or heat damage. The most reliable fix is replacing the failed sensor(s) with OEM-quality parts and clearing codes; in some cases both cam and crank sensors are replaced together due to similar age and failure patterns.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan 23731-6N21A crankshaft position sensor
2002-2006 Nissan Altima 2.5L QR25DE; confirm VIN, DTC and sensor location because catalog terminology can overlap cam/crank/magnet sensor names.
- OEM Nissan 2002-2006 Altima 3.5L camshaft position sensor
2002-2006 Nissan Altima 3.5L VQ35DE; select the DTC-identified bank/side and verify current Nissan part number.
- Genuine Nissan 23731-JA00C crankshaft/magnet sensor
Confirm VIN, DTC and sensor location.
- Genuine Nissan 23731-JA11B camshaft position sensor
Verify VIN, DTC and location; do not infer quantity.
- Genuine Nissan 23731-JA10C crankshaft position sensor
2007-2012 Nissan Altima 3.5L VQ35DE for this card; confirm VIN, exact DTC and crank-sensor location.
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Owner tips & cautions
- TipUse OEM or OEM-supplier sensors; many owners report repeat failures within months when using the cheapest aftermarket cam/crank sensors.
- TipIf one sensor fails on a high-mileage car, many owners proactively replace the matching cam/crank sensors together to avoid another breakdown soon after.
Sources for this issue (3)
- NHTSA Recall 03V455000 - Crank/Cam Position Sensor Solder Joint (2002-2003 Altima)nhtsa
- NHTSA Recall 06V242000 - 2003-2004 Altima 2.5L Crank Angle Sensor Signal Interruption (ECM Reprogram)nhtsa
- NHTSA Recall 07V527000 - 2002/2005-2006 Altima 2.5L Crankshaft Position Sensor Overheat (ECM Reprogram)nhtsa
P0725 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0725 mean on a Nissan?
P0725 stands for "Engine Speed Input Circuit Malfunction." This generic powertrain code means the transmission control module (or PCM) is not receiving a valid engine-speed (RPM) signal. On many vehicles, including Nissan, the crankshaft position sensor generates the signal, the ECM processes it, and the ECM passes it to the TCM over a wire or the CAN bus. The TCM uses engine speed for shift timing and torque converter lockup, and it sets the code when that signal is missing, drops out or reads illogically. It points to the engine-speed signal path (sensor, wiring, CAN network or modules), not to a fault inside the transmission. Input/turbine speed sensor faults are covered by P0715. On Nissan it is documented across 1 model: Altima.
What are the most common causes of P0725?
The most common causes of P0725 are: Faulty crankshaft position (engine speed) sensor or signal dropout, Damaged, corroded, or loose wiring or connectors in the engine-speed signal path, CAN communication circuit fault between ECM and TCM, Poor ground or power supply to the sensor or modules, Faulty TCM or ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0725 on a Nissan?
Published repair estimates on Nissan range from $150 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.