Engine Coolant Temperature Sensor 2 - Voltage Above Normal
The engine coolant temperature sensor 2 is reporting a voltage that is too high.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Inside the engine, there's a sensor that measures how hot the coolant is. If that sensor sends a voltage reading over the normal limit (typically above 5 volts), the computer thinks something's wrong with the sensor or wiring.
What the computer is actually seeing
The computer looks at voltage from the coolant temperature sensor 2, expecting a signal normally between 0.5V and 4.5V, which corresponds to a temperature range of about -40°F to 265°F. A reading above 4.5V indicates a fault.
What a healthy reading looks like
0.5V to 4.5V under normal conditions; anything over 4.5V indicates an issue.
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 the wiring and connector for coolant temperature sensor 2. Look for signs of damage, corrosion or disconnection. Decision: If yes, repair wiring; if no, proceed to step 2.
- 22. Measure voltage at the coolant temperature sensor 2 harness with a multimeter while the engine is at operating temperature. Decision: If voltage is above 4.5V, replace the sensor; if within range, proceed to step 3.
- 33. Check the ground for the sensor circuit. Ensure it has less than 0.5 ohms of resistance. Decision: If the ground is good, consider ECM issues; if faulty, repair ground.
Common causes
- Shorted sensor wiring
- Defective coolant temperature sensor 2
- Poor ground connection
- Corroded connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive with this fault; it could cause overheating or performance issues.
Will this code come back after repairs?
If the cause is properly fixed, the code should clear. If it comes back, further diagnosis may be needed.
Why does this code sometimes pair with SPN 2411 or SPN 2412?
These codes relate to other temperature sensors, indicating that the cooling system might have multiple issues.
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