P0224
Fix within a few daysThrottle/Pedal Position Sensor/Switch 'B' Circuit Intermittent
Code P0224 means your engine computer detects an intermittent fault in the throttle/pedal position sensor 'B' circuit. Common causes: APP sensor (45%), TPS (30%), wiring (20%). Drivability: Limit driving, fix within a few days. Repair cost: $30-$200 DIY, $150-$500 professional.
Can I Drive With P0224?
No, stop driving
Immediate repair needed
Stop driving immediately if: Any loss of power, erratic acceleration, engine stalling, or the Check Engine Light is flashing.
Symptoms of P0224
- 1Engine goes into 'limp mode' (reduced power)
- 2Erratic or unresponsive accelerator pedal
- 3Engine stalls or idles roughly
- 4Check Engine Light is on
- 5Vehicle hesitates or surges during acceleration
Common Causes of P0224
Parts most likely causing this code, ranked by probability
An intermittent fault in the APP sensor 'B' circuit sends incorrect signals to the engine computer, causing unpredictable throttle response.
45% of P0224 cases are fixed by replacing this part
If the 'B' circuit refers to the TPS, an intermittent sensor failure means the engine computer doesn't know the throttle plate's true position.
30% of P0224 cases are fixed by replacing this part
Loose, corroded, or damaged wiring and connectors to either the APP or TPS sensor can cause intermittent signal loss.
20% of P0224 cases are fixed by repairing wiring
Carbon buildup around the throttle plate can cause it to stick or not return smoothly, leading to intermittent sensor readings.
4% of P0224 cases are fixed by cleaning the throttle body
A rare internal fault within the PCM can incorrectly interpret or process the sensor signals, triggering the code.
1% of P0224 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Visually inspect the wiring harness and connectors for the Accelerator Pedal Position (APP) sensor (under the dash) and the Throttle Position Sensor (TPS) (on the throttle body) for any signs of damage, corrosion, or looseness.
- Ensure the throttle body is clean and the throttle plate moves freely without sticking. Carbon buildup can cause intermittent issues.
How to Diagnose P0224
- 1Visually inspect the accelerator pedal assembly and throttle body for any obvious damage or loose connections.
- 2Check the wiring harness leading to both the APP sensor (under the dash) and the TPS (on the throttle body) for chafing, corrosion, or breaks.
- 3Use an OBD-II scan tool to monitor live data for the APP and TPS sensors while slowly pressing the accelerator pedal. Look for smooth, consistent voltage changes without drops or spikes.
- 4Perform a wiggle test on the sensor connectors and wiring while monitoring live data to see if the signal fluctuates.
- 5Test the resistance and voltage of the APP and TPS sensors directly using a multimeter, comparing readings to factory specifications.
P0224 on Popular Vehicles
Ford F-150
2004-2008These years are particularly prone to Accelerator Pedal Position (APP) sensor failures, which often manifest as intermittent P0224 codes and sudden loss of throttle response.
60% fixed by replacing the APP sensor
Honda Accord
2003-2007While less common than on some Fords, P0224 on these Accords can point to a failing Throttle Position Sensor (TPS) on the throttle body, often due to internal wear.
40% fixed by replacing the TPS
Toyota Camry
2007-2011P0224 on these Camrys is less frequent but can sometimes be traced to wiring harness issues near the throttle body or accelerator pedal, especially after other repairs.
35% fixed by repairing wiring
Frequently Asked Questions
What does P0224 mean?
P0224 indicates that the Powertrain Control Module (PCM) has detected an intermittent electrical problem in the 'B' circuit of either the Accelerator Pedal Position (APP) sensor or the Throttle Position Sensor (TPS). This means the signal from the sensor is not consistent.
Can I drive with P0224?
No, stop driving. An intermittent throttle/pedal position sensor can cause sudden loss of power, erratic acceleration, or the engine to go into limp mode. This is a significant safety hazard and requires immediate attention.
Will P0224 clear itself?
No, P0224 will not clear itself. While the Check Engine Light might turn off temporarily if the intermittent fault goes away, the underlying problem remains. The code will return, and the issue will persist until the faulty component is replaced or repaired.
How do I fix P0224 myself?
Start by inspecting the wiring and connectors for damage. If they look good, use a scan tool to identify which sensor (APP or TPS) is acting up by monitoring live data. Replace the faulty Accelerator Pedal Position sensor or Throttle Position Sensor if the data shows erratic readings.
How much does it cost to fix P0224?
DIY repair costs for P0224 are typically $30-$200 for a new APP or TPS sensor. Professional repair at a shop will cost $150-$500, including parts and 1-2 hours of labor for diagnosis and replacement.
P0224 keeps coming back - why?
If P0224 keeps returning, it often means the wrong sensor was replaced, there's a persistent wiring issue that wasn't fully resolved, or the problem is actually with the throttle body itself (e.g., carbon buildup causing sticking) rather than just the sensor.
Will P0224 fail emissions/smog test?
Yes, P0224 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and an intermittent throttle position fault directly impacts engine control and emissions.
What's the difference between P0224 and P0120?
P0224 specifically indicates an *intermittent* fault in the 'B' circuit of the throttle/pedal position sensor. P0120 is a more general code indicating a *general* fault in the 'A' circuit of the throttle/pedal position sensor, which could be a continuous open, short, or incorrect voltage.
P0224 on Ford F-150?
On many Ford F-150 models, especially 2004-2008, P0224 is frequently caused by a failing Accelerator Pedal Position (APP) sensor. The sensor assembly can wear out, leading to intermittent signals and 'limp mode' symptoms.
Questions to Ask Your Mechanic
Did you check the live data for both the Accelerator Pedal Position (APP) sensor and the Throttle Position Sensor (TPS) for intermittent drops or spikes?
Good answer: Yes, I monitored both sensor signals with the engine running and while wiggling the harness. I saw a momentary drop in the APP sensor 'B' circuit, which points to that sensor or its wiring.
Have you performed a continuity and resistance test on the wiring harness between the sensor and the PCM?
Good answer: Yes, I checked the continuity and resistance of the wires from the APP sensor connector all the way to the PCM connector. All readings were within factory specifications, ruling out a major wiring break.
Repair Cost Estimate
DIY Repair
Parts only
$30-$200
Shop Repair
Parts + labor
$150-$500
Save $120-$300 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - requires a good scan tool for accurate diagnosis and comfort with electrical testing, but the physical replacement of sensors is often manageable.
Cost of Waiting
Ignoring P0224 is dangerous. The intermittent nature means your vehicle can suddenly lose power or accelerate unexpectedly, creating a serious safety risk. This is not a code to delay fixing.
While You're In There...
If you're removing the throttle body to clean it or replace the TPS, a new gasket prevents vacuum leaks and ensures a proper seal.
Cleaning the throttle body is a good preventative measure, especially if you suspect carbon buildup is contributing to the intermittent issue.
Tools You'll Need
- OBD-II Scan Tool with live data capability
- Multimeter
- Basic hand tools (sockets, wrenches, screwdrivers)
- Wire stripper/crimper (if wiring repair is needed)
P0224 is a common electrical issue related to throttle control. While it's a critical safety concern, the fix is usually straightforward, involving a sensor replacement or wiring repair, and your vehicle will be safe to drive again.
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Your Next Steps
Step 1: Perform a thorough visual inspection of all wiring and connectors related to the accelerator pedal and throttle body. Look for any signs of fraying, corrosion, or loose connections.
Step 2: Use an advanced OBD-II scan tool to monitor live data for both the APP and TPS sensors. Slowly press and release the accelerator pedal, watching for any sudden drops, spikes, or flat spots in the sensor readings. This helps pinpoint which sensor or circuit is intermittent.
Step 3: If live data points to a specific sensor, replace the Accelerator Pedal Position sensor or the Throttle Position Sensor. If wiring damage is found, repair it using proper connectors and heat shrink.