P01C4 Fuel Pressure Sensor A Circuit Range/Performance

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). P01C4 is the plausibility fault: the signal is valid but stuck or does not match pump control – GM checks its equivalent low-pressure sensor by briefly changing pump output and expecting the pressure to move. 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

Symptoms

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

Repair estimate

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

Parts involved

Related codes

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