What Does P0224 Mean?
This code indicates the throttle/pedal position sensor/switch B circuit is exhibiting intermittent behavior. The ECM has detected momentary voltage spikes, dropouts, or erratic changes in the TPS B signal that do not correspond to actual throttle blade movement. This typically indicates a connection problem or early-stage sensor failure.
Common Causes
35%
Worn throttle position sensor B with intermittent contact on the resistive track causing sporadic signal dropouts
30%
Loose or corroded throttle body connector with intermittent terminal contact from engine vibration
25%
Intermittent break in the TPS B signal, reference, or ground wire at a flex point or chafe location
10%
ECM connector pin tension loss on the TPS B input terminal
Diagnostic Steps
1
Step 1: Graph TPS B voltage on a scan tool while driving and performing normal throttle movements. Watch for sudden spikes or dropouts that do not correlate with pedal input. Record the data for analysis.
2
Step 2: With the engine running, perform a wiggle test on the throttle body connector and wiring while monitoring TPS B on the scan tool. Note any correlation between physical manipulation and signal changes.
3
Step 3: Inspect the throttle body connector for corrosion, moisture intrusion, and terminal integrity. Verify the connector lock tab engages fully and seals are intact.
4
Step 4: Sweep the throttle slowly from closed to wide open while monitoring TPS B voltage on a DVOM. An intermittent sensor will show brief voltage dropouts or spikes at specific positions.
5
Step 5: If the fault is confirmed as internal to the TPS B, replace the throttle body assembly and perform the relearn procedure.
Estimated Repair Cost
$130 - $600
Parts + labor, varies by vehicle and location
This code indicates the throttle/pedal position sensor/switch B circuit is exhibiting intermittent behavior. The ECM has detected momentary voltage spikes, dropouts, or erratic changes in the TPS B signal that do not correspond to actual throttle blade movement. This typically indicates a connection...
The most common cause of P0224 (Throttle/Pedal Position Sensor/Switch B Circuit Intermittent) is: Worn throttle position sensor B with intermittent contact on the resistive track causing sporadic signal dropouts
Typical repair costs for P0224 range from $130 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An intermittent TPS B signal may cause momentary limp mode activation followed by normal operation, creating unpredictable throttle response. This inconsistent behavior can be startling and potentially dangerous during acceleration or highway driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0224 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
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