What does Buick Excelle code 128 mean?
3 Answers
Buick Excelle dashboard displaying code 128 indicates that the engine hood is not closed, possibly because it is not securely latched. The brightness adjustment switch for the Buick Excelle dashboard lights is located on the left side of the steering wheel and can be adjusted by turning the knob. For dashboard information adjustment, you can use the buttons on the right side of the steering wheel to modify the vehicle's dashboard information. Below is relevant information about dashboard lights: Indicator lights: The most common lights you see while driving, such as turn signals, parking lights, etc., which indicate the status of various vehicle functions. Warning lights: These have an alert function, such as the fuel indicator light, door status indicator, seat belt indicator, etc. Generally, warning lights turn off after the driver performs the corresponding action, like the seat belt indicator, which turns off once the seat belt is fastened. Malfunction indicator lights: These are the most critical indicator lights, such as the generator malfunction indicator, transmission malfunction indicator, etc. These malfunction indicators rarely light up under normal circumstances or may briefly illuminate when starting the engine and then turn off. If a malfunction indicator stays lit and is accompanied by a warning sound, it indicates that the vehicle has a fault or abnormality.
I've seen quite a few Buick Excelle models reporting code 128 at the repair shop. Essentially, this fault code usually indicates a low signal voltage from the coolant temperature sensor or an issue with the circuit. In simple terms, the car's computer detects that the signal from the coolant temperature sensor is abnormal, which could be due to a loose connector, aged wiring, or sometimes the sensor being corroded by moisture leading to poor contact. This problem tends to worsen in summer when the air conditioning is on, as prolonged high temperatures can accelerate the aging of the wiring. I recommend first checking if the connectors around the sensor are loose. If you have some knowledge of circuits, you can use a multimeter to measure the voltage. If all else fails, it's best to visit a 4S shop and connect to their diagnostic computer—they can directly view the specific data stream and address the issue accordingly.
Last week, my neighbor's Excelle displayed a code 128 fault, and the mechanic said it was due to an abnormal temperature sensor operation. The specific symptoms included difficulty starting the engine in the morning when cold, and the temperature gauge needle fluctuating erratically. This sensor is installed on the water pipe behind the engine. If it fails, it can cause incorrect fuel injection calculations, leading to a fuel consumption spike of two to three liters. Checking it isn't too difficult—first, inspect the wiring harness for any damage from rodents, then unplug the connector to see if the metal contacts have turned green. You can buy a new sensor online for around 30 to 50 yuan and replace it yourself, but be careful not to burn your hands when draining the coolant.
