P055F

Power Steering Control Module Temperature Sensor Circuit Low

P055F is a generic OBD-II powertrain diagnostic trouble code: Power Steering Control Module Temperature Sensor Circuit Low. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P055F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
Need P055F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P055F means

P055F is a generic powertrain code that sets when the engine control module detects that the engine oil pressure sensor or switch signal is out of its expected range or is not performing as designed. The oil pressure sensor reports actual lubrication pressure to the ECM, which uses it to protect the engine, drive oil-pressure warning indicators, and on some engines manage variable oil pump or timing functions. When the reported pressure falls outside the plausible window for the current engine speed and temperature, or the signal does not track engine operation correctly, the module stores P055F.

The code can reflect a genuine mechanical oil pressure problem or purely an electrical/sensor fault, so it must be diagnosed carefully. A failing oil pressure sensor, low actual oil pressure from a worn pump or low oil level, a restricted oil galley, or wiring and connector problems can all trigger it. Because low real oil pressure can cause severe engine damage, this code should be treated cautiously.

Diagnosis should begin by reading the sensor's live value, then verifying actual oil pressure with a mechanical gauge before condemning the sensor. If the mechanical pressure is correct, attention shifts to the sensor, wiring, and connector; if it is low, the mechanical oil-supply system must be investigated.

Common causes

Most-frequently reported root causes when P055F is logged.

  • 1
    Failed or drifting engine oil pressure sensor or switch.
  • 2
    Genuinely low oil pressure from a worn oil pump.
  • 3
    Low engine oil level or degraded, wrong-viscosity oil.
  • 4
    Restricted oil pickup screen, filter, or oil galley.
  • 5
    Wiring, connector, or ground fault on the oil pressure sensor circuit.
  • 6
    Excessive engine bearing wear lowering actual oil pressure.
  • 7
    ECM fault or incorrect calibration for the oil pressure input.

Symptoms drivers notice

Malfunction indicator lamp and/or oil pressure warning illuminated.
Oil pressure gauge or readout reading implausibly high, low, or erratic.
Possible engine noise such as ticking or knocking if real pressure is low.
Engine may enter reduced-power or protection mode on some vehicles.
Erratic behavior of oil-pressure-dependent functions like variable timing.

How to diagnose P055F

A typical diagnostic flow when this code is present.

  1. 1
    Read all stored codes and review the oil pressure sensor live value and freeze-frame data.
  2. 2
    Check engine oil level and condition before any electrical testing.
  3. 3
    Connect a mechanical oil pressure gauge and compare actual pressure to the sensor reading at idle and higher rpm.
  4. 4
    If mechanical pressure is correct, inspect the sensor connector and wiring for corrosion, damage, or poor ground.
  5. 5
    Measure the sensor supply, signal, and ground circuits against specification.
  6. 6
    If actual pressure is low, investigate the oil pump, pickup, filter, and galleys for restriction or wear.
  7. 7
    Replace the confirmed faulty sensor or repair the oil supply issue, then clear codes and verify.

Related powertrain codes

Frequently asked questions

Is P055F a power steering code?

No. Despite some incorrect references, P055F is an engine oil pressure sensor/switch range-performance code and has nothing to do with power steering.

Is it safe to keep driving with P055F?

Not until you confirm actual oil pressure. If real oil pressure is low, continued driving can cause serious engine damage, so verify with a mechanical gauge first.

How do I know if it is the sensor or a real oil pressure problem?

Compare the sensor's reported value to a mechanical gauge reading. If the gauge shows normal pressure, the sensor or wiring is at fault; if it is low, the engine oil supply is the problem.

Can low oil level cause P055F?

Yes. Low oil level or the wrong oil viscosity can lower actual pressure enough to set the code, so always check oil level and condition first.

Disabling P055F in software

RaceTune can permanently disable P055F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECU families we can disable P055F on

We hold the DaVinci A2L disable definitions for these families, so the exact P055F path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.

  • Bosch MG1CP002 verified

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got P055F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file