OBD Guide

P218B

Throttle/Fuel Inhibit B Circuit

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Reduced engine power
  • Engine transition to emergency mode
  • Increased fuel consumption
  • Unstable engine operation
  • Check Engine light comes on

Causes

  • Open or short circuit in the circuit
  • Throttle Position Sensor Malfunction
  • Problems with the engine control unit
  • Wiring harness damage
  • Contact corrosion

How to Fix

  1. Check continuity of throttle/fuel brake circuit
  2. Test the throttle position sensor
  3. Inspect and, if necessary, replace the wiring harness
  4. Check connections and contacts for corrosion
  5. Scan the engine control module for additional errors

Related codes

Error P218B by Vehicle Brand