If your Honda’s check engine light is on and you’ve pulled a P0223 code, you’re in the right place. This article explains the P0223 Honda Code and what you need to do next.
A P0223 diagnostic trouble code means there’s a problem with your Throttle/Pedal Position Sensor/Switch “B” Circuit High Input. In simpler terms, your car’s computer is getting a voltage signal from one of its throttle sensors that’s higher than normal. This confuses the engine control module (ECM) and can lead to noticeable driving problems.
P0223 Honda Code
Understanding this code is key to fixing it. Your Honda uses several sensors to know exactly where the throttle is. The main players are the Throttle Position Sensor (TPS) and the Accelerator Pedal Position Sensor (APP). The P0223 code specifically points to a fault in the “B” circuit of one of these sensors, indicating the signal voltage is too high.
What Does the P0223 Code Mean in a Honda?
The P0223 code is an OBD-II generic code, so it has the same basic meaning across many car brands, including Honda. Your engine computer monitors the voltage from these sensors constantly. When you press the gas pedal, the sensor’s resistance changes, sending a varying voltage signal.
A “Circuit High Input” reading means the computer sees a voltage that’s above the sensor’s normal operating range—often close to battery voltage (around 5 volts or more). This tells the ECM the sensor or its circuit has a problem, so it turns on the check engine light and stores the P0223 code.
Common Symptoms of a P0223 Code
You’ll likely notice one or more of these issues before or after the light comes on:
* Illuminated Check Engine Light: This is the first and most common sign.
* Reduced Engine Power or Limp Mode: The car may enter a fail-safe mode to protect the engine. You’ll have very little power and won’t be able to accelerate properly.
* Poor Acceleration: The engine may hesitate, stumble, or just not respond when you press the gas.
* Erratic Idling: The engine might surge up and down or stall at stoplights.
* Poor Fuel Economy: The incorrect sensor data can cause the computer to waste fuel.
Main Causes of the P0223 Code in Honda Vehicles
Finding the root cause is a process of elimination. Here are the most likely culprits:
Faulty Throttle Position Sensor (TPS)
This is the most common cause. The TPS is mounted on the throttle body and can wear out or fail internally, sending an incorrect high voltage signal. Over time, the internal wiper and resistor track can get dirty or damaged.
Faulty Accelerator Pedal Position Sensor (APP)
Modern Hondas use an electronic “drive-by-wire” system. The APP sensor under the dash, attached to the gas pedal, can also fail and trigger this code, especially if it’s the sensor “B” circuit inside the assembly.
Damaged Wiring or Connectors
The wiring harness to either sensor can get damaged. Look for:
* Chafed or burnt wires.
* Loose, corroded, or damaged electrical connectors.
* Wiring that’s been chewed by rodents.
Problems in the Throttle Body
While less common, a severely dirty throttle body or a mechanical issue with the throttle plate itself can sometimes interfere with the TPS operation.
Rare: Faulty Engine Control Module (ECM)
This is the least likely cause. An internal problem with the computer itself is rare, but it should be considered only after all other options are ruled out.
How to Diagnose a P0223 Code
You’ll need a basic multimeter and possibly a scan tool that can read live data. Always disconnect the battery before working on electrical components.
Step 1: Scan for Codes
Use an OBD2 scanner to confirm P0223 is present. Check for any other codes, as they can provide additional clues.
Step 2: Visual Inspection
Carefully inspect the wiring and connectors for the TPS (on the throttle body) and the APP (on the gas pedal assembly). Look for obvious damage, corrosion, or disconnections.
Step 3: Check Live Sensor Data
With a scan tool, view the live data for the TPS and APP sensors. As you slowly press the accelerator pedal, watch the readings for Sensor “B.” They should change smoothly. A reading stuck high (often above 4.5 volts) or that doesn’t change indicates a problem.
Step 4: Perform a Voltage Test (with Multimeter)
1. Disconnect the sensor connector.
2. Turn the ignition to “ON” (engine off).
3. Check for reference voltage (usually 5V) and ground at the harness connector.
4. If the harness has power and ground, the issue is likely the sensor itself. If voltage is too high at the harness with the sensor disconnected, there’s a short in the wiring.
Step-by-Step Repair Guide for P0223
Once you’ve pinpointed the likely cause, follow these steps.
Replacing a Throttle Position Sensor
1. Disconnect the negative battery terminal.
2. Locate the TPS on the side of the throttle body.
3. Unplug the electrical connector.
4. Remove the two mounting screws.
5. Install the new sensor. Often, it needs to be aligned or calibrated—consult a service manual for your specific Honda model.
6. Reconnect the battery and clear the codes.
Replacing an Accelerator Pedal Position Sensor
1. Disconnect the negative battery terminal.
2. Locate the APP sensor on the accelerator pedal assembly under the dash.
3. Unplug the electrical connector.
4. Remove the bolts or clips holding the sensor or entire pedal assembly.
5. Install the new unit, reconnect the connector, and reassemble.
6. Reconnect the battery and clear codes.
Fixing Wiring Issues
1. Identify the damaged section of wire.
2. Cut out the bad section.
3. Splice in a new piece of wire of the same gauge using solder and heat shrink tubing for a reliable, waterproof connection. Avoid just using electrical tape.
4. Secure the wiring away from heat or moving parts.
Estimated Repair Costs
Costs vary widely based on the cause and whether you do it yourself.
* Throttle Position Sensor: Part cost is typically $50-$150. With professional labor, total cost might be $150-$300.
* Accelerator Pedal Position Sensor: Part cost is similar, around $80-$200. Total repair cost at a shop could be $200-$400.
* Wiring Repair: If you do it yourself, cost is minimal (just wire and connectors). A shop might charge 1-2 hours of labor ($100-$250).
* Throttle Body Cleaning/Replacement: A cleaning might cost $100-$150. A new throttle body can be $300-$600+ with labor.
Can You Drive with a P0223 Code?
It is not recommended. While the car might run, it can enter limp mode at any time, leaving you with dangerously low power for merging or climbing hills. The erratic performance can also be a safety hazard. You should adress the problem as soon as possible. Have the vehicle towed to a repair facility if it’s already in limp mode.
Preventing the P0223 Code from Returning
While some electrical failures are unpredictable, you can minimize risk:
* Keep the throttle body area clean. During routine air filter changes, inspect the throttle body intake for heavy carbon buildup.
* Avoid spilling liquids or placing objects near the driver’s footwell that could damage the APP sensor wiring.
* Fix any other engine performance issues promptly, as they can sometimes put extra stress on sensor circuits.
* Use quality parts if a replacement is needed.
FAQs About the P0223 Honda Code
Q: Is P0223 a serious code?
A: Yes, it can be. It directly affects throttle control, leading to poor drivability and potential safety issues. It should be fixed quickly.
Q: Can a dirty throttle body cause P0223?
A: It’s not a direct cause, but severe buildup can sometimes cause mechanical binding that leads to strange sensor readings. Cleaning it is a good early step.
Q: Do I need to recalibrate the new TPS or APP sensor?
A: On many modern Hondas, yes. The ECU may need to relearn the sensor’s closed and open positions. This often involves a specific ignition key cycle procedure or using a scan tool. Check your repair manual.
Q: What’s the difference between P0222 and P0223?
A: They are opposites. P0222 indicates a “Low Input” (voltage too low), while P0223 indicates a “High Input” (voltage too high) on the same “B” circuit.
Q: Can I reset the code myself?
A: You can clear the code with an OBD2 scanner, but it will come back if the underlying problem isn’t fixed. The check engine light will turn off only after the problem is resolved and the code is cleared.
Getting a P0223 code in your Honda is a clear call to action. It points directly to a fault in the critical system that tells your engine how much power you want. By understanding the symptoms, causes, and diagnostic steps, you can approach the repair with confidence. Whether you fix it yourself or take it to a professional, addressing a P0223 promptly will restore your Honda’s performance and ensure your safety on the road. Remember to always start with the simplest checks—like wiring and connectors—before replacing major components.