What Does This Mean?
The diagnostic code P0222 is a generic powertrain code applicable to vehicles equipped with OBD-II. Although its definition is standard, repair steps may vary depending on the vehicle’s make and model.
This code indicates that the vehicle’s computer has detected excessively low voltage from the throttle position sensor (TPS). In some vehicles, this lower limit is between 0.17 and 0.20 volts (V). The letter B refers to a specific circuit or sensor within the system.
If the signal voltage drops below 0.17 V, the powertrain control module (PCM) records this code. This may be due to an open circuit, a short to ground, or a loss of the 5V reference voltage.
Possible Symptoms
A vehicle affected by this code may exhibit the following symptoms:
- Unstable or excessively low idle
- Misfires or hesitation
- Irregular acceleration (surging)
- Loss of power or acceleration
- Other engine performance-related symptoms
Possible Causes
Code P0222 can be caused by several factors, including:
- Throttle position sensor (TPS) improperly installed or secured
- Short circuit in the TPS circuit
- Faulty TPS sensor
- Failure of the powertrain control module (PCM)
Solutions and Diagnostic Steps
- Visual Inspection
- Check the condition of the TPS sensor, wiring, and connectors.
- Look for damaged, exposed, or shorted wires.
- Repair or replace faulty components as necessary.
- TPS Voltage Check
- Consult the vehicle’s service manual for precise specifications.
- If the measured voltage is below normal, the sensor may be faulty and require replacement.
- TPS Adjustment
- If the sensor was recently replaced, it may require specific adjustment.
- Some models require precise alignment of the TPS during installation.
- Code Clearing and Road Test
- If no symptoms are present, the issue may be intermittent. Clear the code and perform a road test.
- If the code reappears, carefully inspect the wiring to prevent chafing or accidental grounding.
Conclusion
Code P0222 is related to a malfunction of the throttle position sensor, which can affect engine performance. Thorough inspection and diagnostics help quickly identify the cause of the problem and avoid costly long-term repairs.