Code : C1221
Make : CADILLAC
Description : C1221 CADILLAC Left Front Wheel Speed Sensor Input Signal Is Zero
Possible causes :
– Faulty Hub Assembly (Left Front Wheel Speed Sensor is part of hub assembly)
– Faulty Left Front Wheel Speed Sensor
– Left Front Wheel Speed Sensor harness is open or shorted
– Left Front Wheel Speed Sensor circuit poor electrical connection
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.
