P1623 Transmission Temp Pull-Up Resistor

Tech description

On some 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 Description

P1623 – Malfunction Indicator Lamp (MIL) Open/Short

P1623 – Engine Check Lamp – Malfunction

P1623 – Radiator Cooling Fan – Malfunction