Fuel and air

P0236 — Turbocharger Boost Pressure Sensor A Range/Performance Fault

Severity: medium Drive with care, to a shop

What P0236 means

The engine control unit compares the signal from boost pressure sensor A with the boost it expects at the current load and actuator position. If the reading is out of range or does not match engine conditions, it sets P0236. The cause can be the sensor or its circuit, or a real boost problem such as an air leak or a faulty boost control actuator.

Symptoms

  • Check engine light on
  • Reduced power or limp mode
  • Sluggish acceleration under load
  • Low or unstable boost pressure
  • Higher fuel consumption
  • P0299 underboost may appear alongside

Possible causes

  1. Faulty boost pressure sensor or MAP sensor
  2. Boost leaks in intake pipes, hoses or intercooler
  3. Damaged wiring or corroded, loose sensor connector
  4. Faulty wastegate actuator or boost control solenoid
  5. Stuck wastegate or faulty variable geometry turbo (VGT) actuator
  6. Intake or exhaust leak
  7. ECU software error (rare)

How to diagnose

  1. Read all codes and freeze frame data, and look for P0299 or other boost codes
  2. Inspect hoses, clamps and the intercooler for cracks, oil residue and loose fittings
  3. Check vacuum lines and the boost control solenoid
  4. Inspect the sensor wiring and connector for corrosion, chafing and poor contact
  5. Compare specified and actual boost in live data during acceleration
  6. Test sensor supply voltage, ground and reference signal with a multimeter
  7. Check wastegate or VGT actuator movement over its full range
  8. If everything checks out, look for an ECU software update

Common fixes

  • Replace the boost pressure sensor
  • Replace damaged hoses and vacuum lines and tighten clamps
  • Repair wiring or replace the connector
  • Replace the wastegate actuator or boost control solenoid
  • Reflash or replace the ECU (last resort)

Questions and answers

What does P0236 mean?

The boost pressure sensor A signal does not match the expected range or engine conditions. The cause may be the sensor, its wiring or an actual boost problem.

Can I drive with P0236?

Only briefly and gently, since the engine may drop into limp mode. Get it diagnosed as soon as you can.

Do I always need to replace the sensor for P0236?

No. A leaking intercooler hose or a faulty wastegate actuator is often the real cause. Check the air path and compare live data first.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.