Thermal Management - Temperature or Pressure in System
Indicates an abnormal temperature or pressure in the thermal management system.
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What it means (plain English)
The engine's thermal management system is detecting a temperature or pressure that isn't where it should be, which can lead to overheating or performance issues.
What the computer is actually seeing
The engine control module (ECM) monitors temperature or pressure sensors in the cooling system. If readings exceed the normal ranges, it triggers this fault code.
What a healthy reading looks like
Normal operating temperature should be between 190°F to 220°F (88°C to 104°C). Pressure should ideally be between 10 psi to 15 psi when the engine is running at operating temperature.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors for the temperature and pressure sensors. Look for frays, corrosion, or loose connections.
- 22. Check the coolant level in the reservoir; ensure it is within the normal range.
- 33. Use a scan tool to compare actual sensor readings to expected values. Confirm if the temperature is abnormal or the pressure is off.
- 44. If readings are out of range, test and replace the faulty temperature or pressure sensor. If in range, check for cooling system blockages or leaks.
- 55. Double-check the operation of the thermostat by measuring engine temperature over time; it should reach the operating range within 10 minutes of running. Replace if it fails to open/close properly.
Common causes
- Faulty temperature sensor
- Faulty pressure sensor
- Coolant leaks
- Blocked radiator or coolant passages
- Worn out thermostat
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Drivability may be affected; monitor temperatures closely. If overheating occurs, stop driving immediately.
Will this code come back after clearing?
It may return if the underlying issue is not resolved. Ensure all sensors and components are functioning correctly.
Why is this code paired with SPN 176?
Both codes relate to temperature or pressure issues within the thermal management system, indicating similar faults.
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