What does the 522012 fault code mean?
2 Answers
The following is the meaning of the 522012 fault code: 1. CAN received frame DM1DCU data quantity error. 2. Immediate torque limit-related serious fault in DCU. 3. No signal from the thermostat driver, check if the electronic thermostat plug has poor contact. Here is some extended information: 1. When the cooling temperature is below the specified value, the refined paraffin in the thermostat's temperature-sensitive body is in a solid state, and the thermostat valve closes the channel between the engine and the radiator under the action of the spring. The coolant returns to the engine via the water pump, performing a small circulation within the engine. When the coolant temperature reaches the specified value, the paraffin begins to melt and gradually turns into a liquid. 2. The volume increases accordingly and compresses the rubber tube, causing it to shrink. As the rubber tube shrinks, it exerts an upward thrust on the push rod, which in turn exerts a downward counter-thrust on the valve, causing the valve to open. At this point, the coolant flows through the radiator and the thermostat valve, then returns to the engine via the water pump, performing a large circulation.
Fault code 522012 makes me think it might be an issue with the vehicle's engine control unit, especially common in some domestic car models. I often help friends diagnose car conditions, and this code usually points to a transmission system fault, such as a failed transmission sensor or a malfunctioning throttle position sensor. Symptoms include rough acceleration or increased fuel consumption. Potential causes include aging wiring, sensor dust accumulation, or control module software issues. It's recommended to first use an OBD scanner to read real-time data for confirmation before inspecting and replacing specific components. If this code appears during daily driving, don't panic; pull over safely in time to avoid engine damage from towing.
