What does the C1122 engine speed signal fault mean?

2 Answers
ZoeLee
09/02/25 8:16am
C1122 engine speed signal fault is likely caused by issues with the crankshaft sensor signal or a malfunction in the right front vehicle body acceleration sensor. This situation involves professional technical problems and requires specialized personnel for resolution; it's recommended to visit a 4S dealership for computer diagnostics. Below is an introduction to acceleration sensors: 1. The acceleration sensor consists of a silicon diaphragm, upper cover, and lower cover, with the diaphragm sandwiched between the upper and lower covers, bonded together; one-dimensional or two-dimensional nanomaterial, gold electrodes, and leads are distributed on the diaphragm, with wires drawn out using wire bonding technology; 2. An acceleration sensor is a testing instrument that converts the physical signal of acceleration into measurable electrical signals. Differential capacitive force-balanced acceleration sensors transform measured acceleration into changes in capacitor capacitance.
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LailaDella
09/15/25 3:25am
I think the C1122 trouble code indicates an issue with the engine speed signal, which generally means the speed sensor component is faulty. It's responsible for monitoring the rotational speed of the engine crankshaft, and if the signal can't reach the computer, it can cause difficulties starting the car. The engine might suddenly stall while driving, and the tachometer on the dashboard may display abnormal readings. The reasons could be sensor aging, loose or corroded wiring connectors, or short circuits due to moisture. I've experienced a similar situation where the car shook violently and consumed more fuel. The repair isn't too difficult—first, check the sensor's location near the engine and try unplugging and reconnecting the connector. If that doesn't work, replacing the sensor is a low-cost solution. While driving daily, pay attention to the engine's sound; if you hear unusual noises or see dashboard warnings, get it fixed immediately to avoid being stranded on the road. Safety comes first—if the speed signal is erratic, the entire engine control system is affected.
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