Powertrain
generic / SAE
P0597
Thermostat Heater Control Circuit Open
The map-controlled thermostat - electrically heated to lower its opening temperature on demand for emissions or torque mapping - has an open control circuit. The ECU loses the ability to override coolant flow timing.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 97
Possible causes
- Open in heater element or harness high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–350 €
- Estimated time: 0.5–2 h
- Component: map thermostat heater
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012