Temperature Sensor 2 Circuit High
Signals a high voltage reading from Temperature Sensor 2.
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What it means (plain English)
Temperature Sensor 2 is reporting a voltage above its normal operating range, which can suggest a fault with the sensor or its wiring.
What the computer is actually seeing
The engine control module (ECM) expects to see a temperature signal within a specific range (usually 0-5 volts). When it detects a voltage above this range, it triggers SPN 4813.
What a healthy reading looks like
Normal voltage from Temperature Sensor 2 should be between 0.5V to 2.5V depending on the temperature; anything above 2.5V can trigger a code.
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 Temperature Sensor 2. Look for any visible damage, corrosion, or loose connections. Decision Point: Are there any obvious issues in the wiring?
- 22. If no issues are found, measure the voltage at the connector with the engine running. It should be between 0.5V and 2.5V. Decision Point: Is the voltage above 2.5V?
- 33. If the voltage is too high, disconnect the sensor and measure the resistance across the sensor terminals. The resistance should be within the manufacturer's specification (check service manual). Decision Point: Is the resistance within specs?
- 44. If resistance is out of spec, replace Temperature Sensor 2. If resistance is okay, check the wiring for shorts to power or ground.
- 55. After repairs, clear the fault code and perform a road test. Check for reoccurrence. Decision Point: Does the code return?
Common causes
- Faulty Temperature Sensor 2
- Short circuit in the sensor circuit
- Damaged wiring or connectors
- Corroded connections
- Faulty ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; drivability may be impacted. Drive with caution and fix soon.
Will this code come back after clearing?
If the underlying problem isn't fixed, yes, it will likely return.
Why does this code appear with other SPN codes?
Codes can stack when multiple sensors report issues or faults in the same circuit.
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