P2170: Exhaust Pressure Regulator Vent Solenoid Control Circuit Low

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.

Low severity. Can I keep driving?Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Start with the fuel cap: tighten it fully and check its seal
With the connector unplugged, check whether the signal wire is making contact with ground.
Inspect the hoses and connections around the tank and the charcoal canister
Use the scanner to test the purge and vent solenoid valves
Run a smoke test to find small leaks

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2170 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
1: Air and fuel
70: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2170?

Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.

What causes code P2170?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.