Throttle Position Sensor 2 Voltage Too High
Throttle Position Sensor 2 is reporting a high voltage condition.
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)
The Throttle Position Sensor 2 is supposed to send a voltage signal between 0.5V and 4.5V to the engine controller based on how far the throttle is opened. If it’s above 4.5V, there’s a problem, which can cause engine performance issues.
What the computer is actually seeing
The engine control module (ECM) expects a voltage from Throttle Position Sensor 2. If it sees a voltage above 4.5V, it triggers this fault.
What a healthy reading looks like
Normal operation for Throttle Position Sensor 2 should see voltages between 0.5V and 4.5V.
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.
- 1Inspect the wiring and connector for Throttle Position Sensor 2 for damaged wires or corrosion. Fix any issues found.
- 2Check the voltage at Throttle Position Sensor 2. It should read between 0.5V and 4.5V at idle with the key on, engine off. If it's above 4.5V, proceed to step 3.
- 3Disconnect Throttle Position Sensor 2 and check the harness side for voltage. Make sure there’s no voltage present when the sensor is unplugged. If voltage is present, trace wiring for shorts to power.
- 4Replace Throttle Position Sensor 2 if all wiring checks out and the voltage is still high when plugged in.
Common causes
- Faulty throttle position sensor
- Wiring short to power
- Bad ground connection
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive, as you may experience reduced engine performance or stalling.
If I clear the code, will it come back?
If the issue isn't fixed, yes, the code will likely return after some driving.
What if my truck has multiple codes?
Focus on addressing SPN 1852 first, as it could be linked to throttle issues impacting drivability.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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