Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00CA Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Some engine control modules switch the solenoid of fuel pressure regulator A on both sides: the ground side is monitored by P0090 to P0092, the supply side (high-side driver) by P00C8 to P00CA. On gasoline direct injection the regulator is typically the control valve on the high-pressure pump; on some diesels it is the regulator designated as regulator 1. P00CA reports a short to battery voltage on the supply side, so the driver can no longer switch the supply off. Rail pressure can then not be controlled, causing starting problems, stalling or reduced power; documented systems turn on the warning light in the first drive cycle.

Likely causes

Supply wire shorted to battery voltage
Water or corrosion in the connector
Internal fault in the solenoid
High-side driver in the engine control module faulty

Symptoms

  • Check engine light on
  • Hard starting or stalling
  • Loss of power or limp mode

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–2,000
Time0.5–3 h

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

Parts involved

fuel pressure regulatorfuel pressure regulator wiringhigh pressure fuel pumpengine control module

Related codes

P00C8P00C9P0092P0088P0089

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