Powertrain, generic (extended)

P2170 Exhaust Pressure Regulator Vent Solenoid Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2170 reports the control line of the exhaust pressure regulator vent solenoid pulled toward ground. Jaguar Land Rover uses it for the solenoid of the active exhaust valve; its March 2018 shop foreman call lists P2170-11, meaning the line is grounded, on 2018 Discovery Sport and Evoque with active exhaust. On 2018 and 2019 Evoque, Discovery Sport and E-Pace with the 2.0 Ingenium petrol, MIL and sometimes a restricted performance message appear. JLR suspected high resistance while the valve is switched and asks for a circuit check, a check that the flap moves freely by hand and that the heat shield sits centred on the valve; a cold-soak test in a freezer can reproduce a sticking valve. New PCM software cured unexpected valve operation (JLRTB02020NAS2) and drops the power limitation.

Likely causes

PCM software with an overly sensitive fault strategy, fixed by an update
Exhaust flap stiff, often from a misaligned heat shield or cold weather
Control wire chafed through to ground near the exhaust

Symptoms

  • Check engine lamp on
  • Restricted performance message on some models
  • Exhaust valve heard clicking at start-up

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.2–3 h

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

Parts involved

exhaust pressure regulatorwiring harnessengine control module

Related codes

P2169P2171

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.