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P1620

BAT Team

By BAT Team (Contact Me)
Last Updated 2017-01-17
A site with free advice from mechanics.

Trouble CodeFault LocationProbable Cause
P1620 Instrument Panel Engine Coolant Temperature Signal Open Circuit / Short To Positive (AUDI, VOLKSWAGEN)
Map Cooling Thermostat Control Circuit Signal High (BMW, MINI)
Low Engine Coolant Circuit Conditions (BUICK, CADILLAC, CHEVROLET, GMC)
A/C Relay Malfunction (HYUNDAI)

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Other Manufacturer Specific Definitions for P1620

Low Engine Coolant Circuit Conditions (GM)
Instrument panel, ECT signal - open circuit/ short to positive (Volkswagen)
Instrument panel, ECT signal - open circuit/short to positive (Audi)
Mass air flow (MAF)/volume air flow   (VAF), A – above upper limit (BMW)
Low Engine Coolant Circuit Conditions (Buick)
Low Engine Coolant Circuit Conditions (Cadillac)
Low Engine Coolant Circuit Conditions (Chevrolet)
A/C Relay Malfunction (Hyundai)
Engine control module (ECM) – programming incomplete (Land Rover)
Map Cooling Thermostat Control Circuit Signal High (Mini)
Engine coolant ‘low’ waming lamp switch (Saturn)

BAT Team Discussions for P1620

  • Low coolant level
    Erase all codes, top off coolant level and drive for a drive cycle. NO WAY A p1620 will cause the other codes. Remove the o2/heater sensor fuses and run car. Does the P1620 and P0656 come back?...