P0228 Code Meaning and Next Steps

First checks take 10 to 20 minutes for the first checks. No special tools are usually needed for the first checks.

Can you keep driving?

Stop driving if any of these apply

!The engine starts stalling, losing power sharply, or refusing to respond to throttle normally.
!The check-engine light flashes or the vehicle suddenly runs much worse after the code appears.

If the light is steady and the vehicle still drives normally: Often yes for a short time, but it should not be ignored.

What to check first

Step-by-step checks

1
Free - no tools
Inspect the TPS connector and harness for looseness, corrosion, or heat damage
2
Free - no tools
Check the live throttle reading against actual pedal movement before replacing the sensor
3
Basic tool needed
If the fault appeared after service, make sure the connector was fully seated and not pinched
4
Basic tool needed
If the vehicle has electronic throttle control, check for related throttle actuator or pedal codes too
5
Basic tool needed
If the reading changes when the harness is moved, wiring or connector fault is more likely than the sensor body alone

If the code returns

-If the signal stays high on a known-good circuit, the sensor moves higher on the list.
-If the code returns after replacement, recheck the reference and signal paths.
-If the throttle body is dirty or the plate sticks, correct that before buying another sensor.

Background

What this code means

P0228 is a generic OBD-II code for a high-input throttle position sensor C circuit fault.

That usually means the ECU is seeing a signal higher than expected because the circuit is open, the sensor has drifted, or the connector is not making reliable contact.

Diagnosis

Common causes

Most common

Open TPS circuit

A break in the signal path can make the reading go high.

Common

Failed throttle position sensor

The sensor may have drifted or failed internally.

Common

Connector or pin issue

A loose or corroded connector can create a false-high reading.

Possible

Heat-related harness damage

A damaged harness can fail open near hot engine parts.

Avoid these mistakes

What not to do

xDo not replace the sensor or pump first if there is obvious wiring, connector, or intake damage.
xDo not ignore drivability changes or stalling just because the code sounds electrical.

Parts

Parts that may need replacing

PartTypical costNotes

Throttle position sensor$30-$120Relevant when the live signal stays too high after basic checks.

Connector pigtail repair$15-$90Useful if the plug or pins are damaged.

Harness repair$20-$150Needed if an open circuit or heat damage is found.

Related OBD codes

P0225

P0225 usually means throttle position sensor C has a circuit malfunction.

P0226

P0226 usually means throttle position sensor C is out of range or performing poorly.

P0227

P0227 usually means throttle position sensor C is reading too low.

Source notes

Generic OBD-II (SAE J1979 / ISO 15031-5). P0228 was expanded around common high-input throttle-position faults on the C channel, especially open circuits, sensor drift, and harness damage.

This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.

This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.

Last reviewed: 2026-04-10

Reference: Open reference

P0228 - P0228 Usually Means Throttle Position Sensor C Is Reading Too High