OBD-II code family
Exhaust Pressure Regulator Vent Control Faults (3 codes)
3 related fault descriptions. Use each full code and the exact vehicle service information to identify its circuit, monitored condition, and required tests.
Codes in this family
This is the complete published member list for this guide. Each code retains its own page; shared diagnostic context does not mean that every member has the same test or repair.
What these codes mean
These three generic entries preserve the reported exhaust-pressure-regulator vent control condition. P2169 names circuit/open, P2170 low and P2171 high. The names identify diagnostic categories; they do not establish that every vehicle has a diesel exhaust brake, a vacuum-operated regulator or a separate solenoid in the same physical location.
Identify the reporting module, engine, complete suffix and installed equipment before selecting a circuit procedure. The archived 2012 Jaguar XJ 5.0L index lists P2169-13, P2170-11 and P2171-12 for an active exhaust valve, with open, short-to-ground and short-to-power directions respectively. That bounded index example preserves the conditions but does not supply the wiring, terminals or full pinpoint tests for another application.
Low and high are electrical reports, not direct measurements of exhaust backpressure or proof of a particular valve position. A high report does not automatically identify a failed controller, and a low report does not prove a shorted coil. Have the correct diagram and protected circuit/component checks distinguish the actual connection, conductor, device, control or configuration concern.
A dated software case illustrates why parts should follow the evidence. JLR bulletin JLRTB02020NAS2, 27 April 2020, addresses unexpected active-exhaust operation and P2170-11 on its specified 2018–2019 petrol Evoque, Discovery Sport and E-PACE model/VIN/market combinations. Its PCM remedy applies to that case. It does not authorize a universal solenoid replacement, configuration change or software update, and does not establish that a current warning can be ignored.
Save the complete scan, status, freeze frame, actual warnings and recent exhaust or electrical work. Ask the technician to confirm the equipment and diagnostic application, explain the finding behind the proposed repair, and verify the system afterward. The estimate should follow that confirmed job, including any prescribed setup. Do not assign hardware or a price solely from the generic name.
Do not force or heat exhaust hardware, apply direct power, probe live exhaust wiring or reproduce engine braking on a loaded descent as a trial test. Hot exhaust and moving control devices require the manufacturer’s precautions. Follow actual warnings and seek assessment for unsafe response, unexpected exhaust behavior or unreliable control; neither a circuit label nor a dated software example guarantees safe continued travel.
Identify the circuit on your vehicle
Match the full DTC, reporting module, and any failure-type suffix to the service information for your exact year, make, model, engine, and equipment. An identifier alone does not establish installed hardware count, location, connector pinout, or a universal measurement.
Where the manufacturer publishes its own meaning for this code, that is the one to work from — it describes the actual component on your vehicle, which the generic definition cannot. Keep the generic description for what it is good for: it tells you which subject area the standard assigned the code to, which is useful context when the two appear to disagree. If they do disagree, follow the manufacturer.