Powertrain, generic · Fuel and air metering

P01C5 Fuel Pressure Sensor A Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

Fuel pressure sensor A is a fuel pressure sensor without 'rail' in its name and without a bank – unlike the rail pressure sensors P0190–P0194 and P01BE–P01C2; which sensor it is depends on the manufacturer. The only documented case is FCA, where sensor A is the low-pressure sensor in the supply line, read together with the fuel pump control module. GM calls its low-pressure sensor 'sensor B' (P018A–P018E). P01C5 means the signal voltage is below its lower limit – typically a signal wire shorted to ground or an open signal or 5 V reference wire (GM's comparable limit is 4 % of the reference). No manufacturer document using exactly this code was found; the description rests on CARB's circuit monitoring requirement, the FCA sibling code P01C6 and GM's equivalent low-pressure sensor checks.

Likely causes

Signal wire shorted to ground or open

5 V reference missing

Connector corroded or wet

Sensor faulty

Symptoms

Check engine light on
Hard starting or stalling possible
Hesitation or lack of power under load

Repair estimate

DifficultyMediumDIY possible

Parts and labour€50–350

Time0.5–2.5 h

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

Parts involved

fuel pressure sensor afuel pump control modulesensor wiring

Related codes

P01C3 P01C4 P01C6 P01C7 P018C

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.