Tech notes

On some Hyundai models, the P1623 code is for the “Check Engine Lamp”. If this codes is stored in the Engine Control Module (ECM), the check engine light is probably not illuminating. If this is the case the wire circuit from the ECM is probably open or shorted, or the check engine light bulb is blown or missing.

P1623 HYUNDAI Description

P1623 – Malfunction Indicator Lamp (MIL) Open/Short
P1623 – Engine Check Lamp – Malfunction
P1623 – Radiator Cooling Fan – Malfunction