P1296 - FAULT CODE - OBD2

P1296 AUDI, VOLKSWAGEN: ENGINE COOLING SYSTEM MALFUNCTION

Engine temperature plays an essential role in the efficient operation of the engine due to temperature directly influences the combustion process. Combustion is moderately lean in a cold engine. The Powertrain Control Module (PCM) improves the air-fuel mixture till the engine coolant is approximately 104° F to aid combustion. Nevertheless, this action rises emissions meaningfully till the coolant temperature may be in a minimum level, so the PCM will reduce emissions and fuel will be saved.

The Powertrain Control Module relies on the input data from the ECT (Coolant Temperature Sensor) to regulate and control the coolant temperature. This is compared to the desired temperature, which is determined by the time elapsed since engine start-up, as well as the intake air.

The P1296 OBD2 diagnostic code on Volkswagen, Audi, and Volvo vehicles shows the PCM has found a condition in which the engine coolant is not achieving a predetermined temperature. Typically, this temperature is 175°F, which must be reached within a continuous engine operating time.

• Check Engine lamp ON.
• Problems during engine start-up.
• Increased exhaust emissions.
• Lower fuel efficiency.

Reasons for setting the P1296 OBDII DTC P1296 OBDII code:

• The engine coolant temperature sensor wires or connectors may be faulty.
• The engine coolant level may not be enough.
• The thermostat may be stuck.
• The ECT sensor may be faulty.

To troubleshoot the P1296 OBD2 fault code, try this:

• First, consult the Technical Service Bulletins.
• Verify that the coolant level is adequate. If a low level is found, make the appropriate corrections.
• Check all the wiring and connectors in the Engine Coolant Temperature Sensor Look for corrosion, burns, or any other deficiencies and make the appropriate repairs.
• Measure the ECT Sensor circuit voltages, and check that they match the manufacturer's specifications. If you find an out-of-range voltage, make the appropriate corrections.
• Check the integrity of the ECT Sensor. If you determine that it is faulty, replace it.