Volvo Fuel Pressure Signal Too High ECM 2600

Vehicle: 2008 Volvo S40 2.4i, Odometer 180,000 Km.

Symptoms: Check engine light illumination, otherwise there are no other symptoms. Vehicle drives and runs fines with no hiccups or misfires. Check engine light comes back a day or two after clearing trouble codes but in some cases is inconsistent, can stay off for a week or more and then come back again.

No other issues with vehicle apart from fault code EMC- 2600, Fuel pressure sensor, Signal too high. Trouble codes can also manifest as P0193 or P0088.

As with all trouble code indications first reaction will be to replace fuel sensor or PEM module (fuel pump module) which is a known issue due to bad location right in front of right rear wheel and exposed to elements. And that is what was done in this case, Fuel Sensor and PEM were replaced with OEM parts. That did not fix the problem. Check engine light came back within a week with same ECM 2600 Fuel Pressure Sensor, Signal Too High fault code.

Solution: Replace Engine Oil Cap. Issue was a failing engine oil cap gasket and can affect all Volvo models…and other cars for that matter. As time passes engine oil cap gasket fails due to engine heat/cold cycles and introduces unmeasured air into manifold causing all kinds of erratic problems with fuel trims.

Before you start replacing fuel sensors and control modules when looking at fuel trim issues on a Volvo or Fuel Pressure Sensor, Signal Too High trouble code start by replacing engine oil cap. Oil cap is cheap and needs to be eliminated as a cause before continuing diagnostics.

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