What Does P0222 Mean?
This code indicates the throttle/pedal position sensor/switch B circuit output voltage is below the ECM's minimum expected threshold, typically below 0.2V. This low input condition may be caused by a sensor fault, wiring short to ground, or loss of reference voltage to the sensor. The ECM cannot determine accurate throttle position from sensor B.
Common Causes
35%
Failed throttle position sensor B with internal short to ground or broken resistive element causing near-zero output
30%
TPS B signal wire shorted to ground in the wiring harness from chafing, pinching, or water intrusion
20%
Lost 5V reference voltage to TPS B from an open in the reference supply wire or shared reference overload
15%
Corroded or water-damaged throttle body connector pulling the signal low through a low-resistance path
Diagnostic Steps
1
Step 1: With key on engine off, measure TPS B signal voltage at the throttle body connector. A reading below 0.2V confirms the low input condition. Normal closed-throttle reading for TPS B depends on design but is typically 0.5-1.0V or 4.0-4.5V (inverse type).
2
Step 2: Disconnect the throttle body connector and check TPS B signal voltage at the ECM harness side. If the voltage rises to the reference voltage range (approximately 5V), the sensor is internally shorted. If it remains low, there is a wiring fault.
3
Step 3: Verify the 5V reference voltage is present at the throttle body connector. If missing, trace the reference circuit for an open. Check if other sensors sharing the 5V reference are also affected.
4
Step 4: With the connector disconnected, check for shorts to ground on the TPS B signal wire by measuring resistance from the signal pin to chassis ground. Should read OL (open). Low resistance indicates a short.
5
Step 5: Replace the throttle body if TPS B is integrated, or replace the accelerator pedal assembly if the fault is in the pedal sensor. Perform throttle relearn procedure after replacement.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the throttle/pedal position sensor/switch B circuit output voltage is below the ECM's minimum expected threshold, typically below 0.2V. This low input condition may be caused by a sensor fault, wiring short to ground, or loss of reference voltage to the sensor. The ECM cannot det...
The most common cause of P0222 (Throttle/Petal Position Sensor/Switch B Circuit Range/Performance Problem) is: Failed throttle position sensor B with internal short to ground or broken resistive element causing near-zero output
Typical repair costs for P0222 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low TPS B signal typically forces the vehicle into reduced power mode with limited throttle response. This protects against unintended acceleration but significantly reduces vehicle performance. Prompt repair is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0222 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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