Powertrain, generic · Fuel and air metering

P0192 Fuel Rail Pressure Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The rail pressure sensor A measures the pressure in the high-pressure fuel rail of common-rail diesels and petrol direct-injection engines; it is either a three-wire sensor (5 V reference, ground, signal rising with pressure, about 0.5 V at 0 bar) or a digital SENT sensor with two measuring channels. The engine module uses it as the feedback signal for rail pressure control. P0192 means the signal is below the physically possible range – typically a signal wire shorted to ground or an open 5 V reference. Limits: Ford diesel below 0.13 V for 0.5 s, Ford petrol direct injection below 0.20 V for 5 s, GM diesel below 4.3 % of supply, GM 6.6 litre below 0.19 V, Saab/GM 2.0 diesel below 0.25 V. Monitored continuously; GM one trip, Saab two. If several sensors report low voltage at once, the shared 5 V reference is the likely cause. On a fault the module uses a substitute value and usually limits power.

Likely causes

Signal wire shorted to ground, harness chafed
5 V reference open or shorted
Connector corroded or loose
Rail pressure sensor faulty internally
Engine control module

Symptoms

  • Check engine light on
  • Limp mode or 'Reduced Engine Power'
  • Hard starting, stalling
  • Rough running

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–500
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel rail pressure sensorsensor wiringsensor reference voltage

Related codes

P0190P0191P0193P0194P01C0P06A6

References: law.cornell.edu, fordservicecontent.com, fordservicecontent.com, gsi.ext.gm.com.