Fault code P0725 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0725 – Engine Speed input Circuit Malfunction

P0725: Causes, signs and repairs

Error code P0725 is displayed and the check engine light is on - what does this mean?

The OBD system detects a defect in the speed sensor circuit of the input shaft of the automatic transmission. This DTC P0725 indicates problems with the sensor that monitors the speed of the transmission input shaft and provides important data for transmission control.

What causes can this error code have?

Defective input shaft speed sensor
Damaged wiring to the sensor
Corroded or loose plug connections
Defective transmission control unit (TCM)
Mechanical damage to the sensor wheel
Dirt or metal chips on the sensor
Interrupted ground wire
Short circuit in the sensor cable

What symptoms occur in parallel with error code P0725?

Shifting problems: The transmission shifts irregularly or jerkily
Emergency running program: The transmission remains in a fixed gear
Starting problems: Engine does not start or starts with difficulty
Jerking when starting off: Vehicle jerks when driving off
Increased fuel consumption: Consumption increases significantly
Uneven idling: Engine runs unevenly when stationary
Indicator lights: Check engine light and transmission warning light illuminate

How can the problem with error code P0725 be rectified?

The repair requires a systematic diagnosis of the transmission electronics and the sensor system.
Replace the sensor: Replace the defective input shaft speed sensor completely, taking note of the correct installation position
Repair wiring: Locate damaged cables to the sensor, repair severed cables or replace the complete cable set
Clean plug connections: Clean all electrical connections on the sensor and control unit, replace corroded contacts and treat with contact spray
Replace transmission control unit: If the TCM is defective, replace the entire control unit and then have it programmed
Repair the sensor wheel: Repair mechanical damage to the pulse wheel or disassemble the entire transmission if it is badly damaged
Clean the gearbox: Remove metal shavings and dirt from the transmission housing and change the transmission oil

FAQ - Frequently asked questions about DTC P0725

Can I continue driving with error code P0725?

Short journeys are possible, but you should have the vehicle repaired as soon as possible. The transmission may remain in emergency mode and cause further damage.

How much does it cost to repair error code P0725?

The costs vary between 150-800 euros, depending on the cause. A sensor replacement costs around 150-300 euros, while transmission repairs can cost up to 800 euros.

How do I recognize a defective speed sensor with P0725?

Typical signs are irregular shifting, jerking when starting off and the transmission warning light coming on. An OBD diagnosis confirms the error code.

Can I delete the P0725 error code myself?

Deletion is possible with an OBD scanner, but the code will return if the cause has not been rectified. Professional diagnosis is recommended.

What consequential damage can the error code P0725 cause?

If left untreated, the defect can lead to transmission damage, increased clutch wear and costly repairs. Early repair saves costs.

Is P0725 a manufacturer-specific trouble code?

No, P0725 is a standardized EOBD code that has the same meaning for all manufacturers. However, the repair procedures may vary.

Vehicles in which fault code P0725 occurs most frequently

Error code P0725 is a standardized OBD fault code for problems with the input shaft speed sensor and can occur in all vehicles with automatic transmissions, but is most common in the following vehicles:

Honda: Accord, Civic, CR-V, Pilot (2003-2012)
Toyota: Camry, Corolla, RAV4, Highlander (2004-2014)
Nissan: Altima, Sentra, Maxima, Murano (2005-2013)
Ford: Focus, Fusion, Escape, Explorer (2006-2015)
Chrysler: 300, Sebring, Town & Country (2007-2014)
Volkswagen: Jetta, Passat, Tiguan (2008-2016)
BMW: 3 Series, 5 Series, X3, X5 (2009-2017)
Mercedes-Benz: C-Class, E-Class, ML-Class (2010-2018)

If code P0725 occurs in your vehicle, you should first check the transmission fluid and have a professional OBD diagnosis carried out. Many problems can be rectified cost-effectively through timely maintenance and replacement of the speed sensor before major transmission damage occurs.

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