Error code

OBD2 P0221

OBD2P0221
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Throttle/Pedal Position Sensor/Switch 'B' Circuit Range/Performance.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0221 indicates an issue with the throttle position sensor B or accelerator pedal position sensor B on your vehicle's drive-by-wire system.

Symptoms

  • Check Engine light is illuminated
  • Visible black smoke from tailpipe at startup
  • Hard starting, no-starting conditions
  • Poor acceleration and power loss
  • Rough idling or hesitation/stalling upon acceleration

Common Causes

  • Damaged, short-circuited, or corroded wiring and connectors
  • Defective throttle position sensor (TPS) or pedal sensors
  • Mal-adjusted TPS sensors
  • Mechanical wear in the TPS sensor and/or throttle body
  • Carbon deposits impeding throttle plate movement

Diagnosis

  1. Check for correct adjustment of the TPS sensor
  2. Inspect wiring and connectors for damage or corrosion
  3. Test sensors' output with a suitable scanner
  4. Clean throttle body if carbon deposits are present

Fixes

  • Replace defective throttle position sensor (TPS) or pedal sensors

FAQ

What should I do if the TPS is not adjustable?

If the TPS is not adjustable, it is likely defective and needs to be replaced.

How can I check for carbon deposits in the throttle body?

Inspect the throttle body for any obstructions or residues that may impede the movement of the throttle plate.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →