P0235 A fault in the circuit of the turbocharger boost pressure sensor A

Turbocharger boost sensor A circuit malfunction

Severity not verified — if the car runs badly, have it inspected

No source we read says how urgent this code is, so we have not set a severity; have it read and checked rather than assuming it is harmless.

Source: how we rate severity

P0235 in short

P0235 means the engine computer detected a fault in the circuit of boost pressure sensor A on a turbocharged or supercharged engine. Wiring faults, a failed boost sensor, leaking intake ducting or a worn turbo can set it. Some cars go into limp mode.

Boost sensor A measures the pressure the turbocharger or supercharger is building. The computer uses it to control boost.

TroubleCodes.net says the code sets when the computer finds a malfunction in that circuit. Depending on the vehicle, it may set other codes and limit engine power.

The Delaware DMV list titles P0235 as a turbocharger boost sensor A circuit malfunction, matching the other source.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Damaged, burnt, shorted, disconnected or corroded wiring or connectors

    Common general cause
    Why it ranks here
    TroubleCodes.net lists wiring and connector faults first.
    What would change this
    Damaged wiring or a corroded connector raises it.

  2. Defective boost pressure sensor

    Common general cause
    Why it ranks here
    The sensor itself is listed.
    What would change this
    A sensor reading that does not follow real boost raises it.

  3. Damaged or perforated inlet ducting, or a worn turbo or wastegate

    Possible — needs testing
    Why it ranks here
    The page lists ducting, turbo or supercharger wear and the pressure relief device as causes.
    What would change this
    Visible leaks or boost that cannot build raise it.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read boost sensor A on a scan tool with the engine off, then compare it with the value on a drive.

    Low riskTool: scan tool with live data

    • IfThe reading is fixed or implausible

      It meansThe sensor or circuit is suspect.

      Go to step 2

    • IfThe reading looks plausible

      It meansCheck for boost leaks.

      Go to step 2

  2. Inspect the boost sensor connector, wiring and the intake ducting for damage or leaks.

    Use caution

    Warning:Do this with the engine off and cool; the turbo and exhaust are very hot and the intake ducting can be under pressure when running.

Symptoms

  • Check engine light
  • Possible limp mode with reduced power

How to fix

On your vehicle

Jeep

  • 2024–2025 · Compass

    Supported by vehicle data

    Jeep bulletin 08-086-25 covers the PCM wiring harness contacting the PCM bracket, with the check engine light on and P0235 (turbocharger pressure sensor signal circuit short to ground) set. Whether it is still current is not verified.

  • 08-086-25Status unverified

    PCM wiring harness contacting PCM bracket, MIL with P0235

    2024–2025compass · issued · NHTSA 11015894

    Bulletin on the powertrain control module wiring harness contacting the PCM bracket. Customers must have the check engine light on and P0235 (turbocharger pressure sensor signal circuit short to ground) among the codes set. Only the NHTSA summary was read, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P0235 yet.

All Turbocharging, fuel pressure and EGR codes

P0235 questions

Will my car go into limp mode with P0235?

TroubleCodes.net says the computer may set additional codes and, depending on the vehicle, may enter a failsafe or limp mode.

Sources and review

  1. P0235 trouble code — TroubleCodes.net
  2. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
  3. 08-086-25: PCM wiring harness contacting PCM bracket, MIL with P0235 — Jeep
Last reviewed
Written by
Saurabh K.
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