P1256
Engine Coolant Temperature Sensor Open/Short To Positive
P1256 is an OBD-II diagnostic trouble code meaning: Engine Coolant Temperature Sensor Open/Short To Positive. Common causes: broken wiring to the temperature sensor, short circuit to positive in the sensor circuit. Estimated repair cost: $6–28.
Symptoms
- Incorrect temperature readings on the dashboard
- Increased fuel consumption
- Difficulty starting a hot engine
- Non-steel idle operation
- Turning on the Check Engine Light
Causes
- Broken wiring to the temperature sensor
- Short circuit to positive in the sensor circuit
- Faulty coolant temperature sensor
- Corrosion or poor contact in the sensor connector
- Engine control unit malfunction
How to Fix
- Visual inspection of the sensor wiring and connector for damage
- Checking the sensor resistance at different temperatures
- Checking voltage and continuity using a multimeter
- Replacing a faulty coolant temperature sensor
- Clean connector contacts or replace if necessary
Related codes
Error P1256 by Vehicle Brand
FAQ
What does the P1256 code mean?
P1256 is an OBD-II diagnostic trouble code that indicates: Engine Coolant Temperature Sensor Open/Short To Positive
What causes a P1256 error code?
The most common causes of P1256 include: Broken wiring to the temperature sensor; Short circuit to positive in the sensor circuit; Faulty coolant temperature sensor; Corrosion or poor contact in the sensor connector.
How do I fix a P1256 diagnostic trouble code?
To fix P1256: Visual inspection of the sensor wiring and connector for damage. Checking the sensor resistance at different temperatures. Checking voltage and continuity using a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1256?
Limited driving only, diagnose soon
How much does it cost to fix P1256?
The estimated repair cost for P1256 is $6–28. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat