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P1620 – CADILLAC

Code : P1620
Make : CADILLAC
Description : P1620 CADILLAC Low Engine Coolant Circuit Conditions
Possible causes :
– Faulty Engine Coolant Switch
– Engine Coolant Switch harness is open or shorted
– Engine Coolant Switch 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.

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