Powertrain, generic · Fuel and air metering

P01CA Fuel Rail Pressure Too Low - Engine Cranking Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Some V engines have a separate high-pressure fuel circuit per bank, each with its own pump or rail – for example Audi's 4.0 TFSI V8 with a second high-pressure pump for bank 2. These codes are the bank 2 counterparts of the system pressure codes for bank 1. P01CA is the bank 2 counterpart of P00C6: during cranking the rail pressure on bank 2 does not rise quickly enough to the minimum needed to release injection. For bank 1 GM checks once per start that pressure exceeds about 3 MPa and does not fall below 2 MPa, with two trips. No manufacturer using exactly this code was found; GM's two-rail LT6 reports the same situation with the bank-neutral P00C6.

Likely causes

High-pressure pump of bank 2 or its drive weak
Low supply pressure at start (lift pump, check valve)
Leak or leaking injector on bank 2
Bank 2 rail pressure sensor or connector

Symptoms

  • Check engine light on
  • Long cranking or no start
  • Rough running right after start

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

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

Parts involved

high pressure fuel pump bank2fuel rail bank2fuel pump

Related codes

P00C6P01C8P01C9P01BF

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