Powertrain, generic (extended)

P2142 EGR Throttle Control Circuit A High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2142 reports a high signal or overcurrent in the drive circuit of EGR throttle A. Either a motor lead has contact with battery voltage, or the motor draws more current than the output stage allows – from shorted turns or because carbon has jammed the blade. The driver then shuts down for protection, the flap springs back to its rest position and EGR regulation is lost. No manufacturer publishes thresholds for P2142; CARB obliges the system to recognise circuit faults of output components in both directions. P2141 is the low counterpart, P0487 the open circuit and P0488 the function check of the same flap; flap B reports a high circuit as P213D. If the cause is mechanical, cleaning or replacing the flap removes it, a wiring short needs a harness repair.

Likely causes

Drive wire shorted to battery voltage
Flap jammed by carbon, motor overloaded
Shorted turns in the actuator motor
Faulty output stage in the engine control module

Symptoms

  • Check engine lamp on
  • Reduced power or limp mode
  • EGR readiness not completed

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr throttle a

Related codes

P2141P0487P0488P213D

References: law.cornell.edu, ms-motorservice.com.