Join Now
International Automotive Technicians Network

P0128 Diagnostic Trouble Code Discussion for January 2007

Thermostat System Malfunction


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2001 BMW 325i 2.5L Misfire, MIL Lamp on VIN: WBAAV33431
P0128: coolant temp. The car seamed to run fine, no misfire detected due test drive. Spark plugs were replaced within 1,000 miles.
January 06, 2007
2001 BMW 325i 2.5L Misfire, MIL Lamp on VIN: WBAAV33431
P0128: coolant temp. The car seamed to run fine, no misfire detected due test drive. Spark plugs were replaced within 1,000 miles.
January 11, 2007
2002 Mercedes-Benz C230 Kompressor 2.3L MIL Lamp on VIN: WDBRN47J12
P0128: Coolant Themostat Coolant Temp Below Thermostat Regulating Temperature. ... I tracked the P0128 down to a faulty themostat and have one on order. The P0456 shows a small evap leak detected per AllData but my scan tool brings it up as a gross EGR leak. I need to know which system this code is for ...
January 16, 2007
2000 Chevrolet Monte Carlo SS 3.8L MIL Lamp on, Coolant Fans On VIN: 2G1WX12KOY
P0128: ECT Sensor Below Thermostat Regulating Temperature. Hello GM techs, this Monte Carlo will be performing normally, then while driving (doesn't matter what speed) the temperature guage will drop completely cold and CEL will come on and PCM will command coolant fans on. The fans will run some time after car is tur...
January 28, 2007
2001 Chevrolet Impala 3.8L MIL Lamp on VIN: 1G1W567KE1
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. This car will run the cooling fans after you turn the key off for approx 1 min. It happens evey time. Even when you start in the morning with IAT at 23*F(it is 15 degrees F here now) I have pulled #1 relay and found the PCM to be grounding the turn on wire at ...
January 30, 2007
2001 BMW 325i 2.5L Misfire, MIL Lamp on VIN: WBAAV33431
P0128: coolant temp. The car seamed to run fine, no misfire detected due test drive. Spark plugs were replaced within 1,000 miles.
January 06, 2007
2001 BMW 325i 2.5L Misfire, MIL Lamp on VIN: WBAAV33431
P0128: coolant temp. The car seamed to run fine, no misfire detected due test drive. Spark plugs were replaced within 1,000 miles.
January 11, 2007
2002 Mercedes-Benz C230 Kompressor 2.3L MIL Lamp on VIN: WDBRN47J12
P0128: Coolant Themostat Coolant Temp Below Thermostat Regulating Temperature. ... I tracked the P0128 down to a faulty themostat and have one on order. The P0456 shows a small evap leak detected per AllData but my scan tool brings it up as a gross EGR leak. I need to know which system this code is for ...
January 16, 2007
2000 Chevrolet Monte Carlo SS 3.8L MIL Lamp on, Coolant Fans On VIN: 2G1WX12KOY
P0128: ECT Sensor Below Thermostat Regulating Temperature. Hello GM techs, this Monte Carlo will be performing normally, then while driving (doesn't matter what speed) the temperature guage will drop completely cold and CEL will come on and PCM will command coolant fans on. The fans will run some time after car is tur...
January 28, 2007
2001 Chevrolet Impala 3.8L MIL Lamp on VIN: 1G1W567KE1
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. This car will run the cooling fans after you turn the key off for approx 1 min. It happens evey time. Even when you start in the morning with IAT at 23*F(it is 15 degrees F here now) I have pulled #1 relay and found the PCM to be grounding the turn on wire at ...
January 30, 2007