Engine Temperature Too High
The engine is running hotter than expected during operation.
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What it means (plain English)
The engine's coolant temperature sensor is detecting that the coolant is running above normal limits, often above 230°F (110°C), which can cause overheating and damage.
What the computer is actually seeing
The engine control unit (ECU) reads the coolant temperature sensor input showing values that exceed preset thresholds, which may trigger a warning or reduce engine performance.
What a healthy reading looks like
Normal coolant temperature range is typically between 180°F (82°C) and 220°F (104°C). Over 230°F (110°C) triggers SPN 376.
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. Check coolant level; it should be between the minimum and maximum marks. Decision: If low, add coolant and retest; if normal, proceed to step 2.
- 22. Inspect for coolant leaks around hoses, radiator, and engine block. Decision: If leaks found, repair; if none found, proceed to step 3.
- 33. Test the coolant temperature sensor using a multimeter; it should output a resistance that indicates the coolant temperature. Decision: If faulty, replace sensor; if okay, proceed to step 4.
- 44. Verify proper operation of the thermostat by checking if the engine warms up quickly and the lower radiator hose gets hot. Decision: If thermostat is stuck, replace it; if operating correctly, proceed to step 5.
- 55. Check for any cooling system blockages (like debris or a blocked radiator). Decision: If blockage found, clear it; if not, suspect deeper mechanical engine issues.
Common causes
- Insufficient coolant level
- Coolant leaks
- Faulty coolant temperature sensor
- Failed thermostat
- Blocked radiator or cooling system
- Engine mechanical issues (e.g., head gasket failure)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
No, driving with SPN 376 can lead to engine overheating, potentially causing severe engine damage.
Will this code come back after I clear it?
If the underlying issue is not resolved, the code will likely return after the engine runs for a while.
Why does this code sometimes pair with SPN 371?
SPN 371 indicates coolant temperature sensor performance issues, which can cause overheating readings related to SPN 376.
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