Throttle/Pedal Position Sensor C Circuit High
The P0228 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor C Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P0228?
- Check Engine Light illuminated
- Reduced engine power
- Throttle position reads near 100% on scan tool at idle
- Engine may race or idle too high
What Causes P0228? (Most Likely First)
- Open signal wire in TPS C circuit Very High
- Failed TPS C sensor (open internally) High
- Disconnected TPS C connector Moderate
- Short to voltage in signal wire Low
Can I Still Drive with P0228?
Short distances only. P0228 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What causes a high circuit on TPS C?
A high circuit means the signal voltage is too high, usually from an open wire (signal floats to reference voltage) or a failed sensor.
Can a disconnected sensor cause P0228?
Yes, if the TPS connector is not fully seated, the signal wire becomes open and the voltage will float high.
Is P0228 dangerous?
It can be if the PCM interprets the high reading as full throttle demand. Most systems enter limp mode as a safeguard.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0228?
-
Read TPS C voltage on scan tool. Above 4.8V at idle confirms high circuit condition.
-
Check TPS connector is fully seated and plugged in.
-
Measure TPS C signal wire for open circuit or short to 5V reference.
-
Test TPS resistance/voltage output across full throttle range. Open at any point confirms sensor failure.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0228?
- 2010-2020 Nissan Pathfinder
- 2012-2019 Kia Sorento
- 2008-2018 Hyundai Santa Fe
- 2011-2020 Subaru Outback
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.