Fault code P1296 – a step-by-step guide to diagnosing and fixing it

Error code P1296 is displayed and the check engine light is on - what does this mean?

The DTC P1296 is a manufacturer-specific trouble code that is recognized by the OBD/EOBD systems and indicates a problem with the engine coolant temperature control or the cooling system. This trouble code mainly occurs in Ford vehicles and can affect various coolant-related components.

What can cause this error code?

• Defective coolant temperature sensor
• Damaged thermostat
• Loose or corroded plug connections in the cooling system
• Defective water pump
• Clogged radiator or coolant lines
• Low coolant level
• Faulty engine control unit (ECM/PCM)
• Damaged cable connections to the temperature sensor

What symptoms occur in parallel with fault code P1296?

• Engine overheating: The engine becomes unusually hot and the temperature display rises into the red range
• Starting problems: The vehicle is difficult to start or starts irregularly
• Unsteady idling: The engine runs unstable or rough when idling
• Reduced engine power: Noticeable loss of power while driving
• Increased fuel consumption: Consumption increases noticeably
• Radiator fan runs permanently: The fan switches on more frequently or permanently

How can the problem with error code P1296 be rectified?

• The repair requires a systematic diagnosis of the cooling system and the corresponding sensors.
• Check the coolant level and top up if necessary, checking the entire cooling system for leaks
• Replace the coolant temperature sensor if the resistance values are out of specification
• Replace the thermostat if it does not open or close properly
• Clean all electrical connections and plugs in the cooling system and check for tightness
• Replace the water pump if it is defective or does not supply sufficient coolant
• Flush or replace the radiator if it is blocked or damaged
• Reprogram or replace the engine control unit in the event of permanent faults