Starting authorization and fuel diagnosis
First separate no-crank from crank/no-start. No-crank requires testing the 12-volt system, start authorization, starter control and relevant interlocks. Crank/no-start requires checking engine speed input, fuel pressure, spark or injection command, and immobilizer status. Compare requested and measured fuel-rail pressure during the failure rather than guessing at the pump. Hot-soak and cold-start failures may follow different diagnostic paths.
Repair decisions and verification
Verify repeatable starts under the conditions that originally produced the fault and check for stored or pending faults.
Vehicle context: C 300, 2013. Chassis: C-Class W204 4MATIC Sedan. The same warning may require a different diagnostic path on another engine or year.
Symptoms and customer complaints
Crank/no-start with P0001 quantity-control-valve electrical/open-circuit fault.
Intermittent crank/no-start with numerous voltage and communication faults.
P008A crank/no-start after in-tank pump replacement; runs on alternate fuel.
No crank/no start; battery, starter and fuses reported good.
Recorded trouble codes: P0001, 0894, 0732, U1165-00, U0168-87, B210D-00, B210A-00, B1191-00, B1505-00, B2330-00. A stored code points to a monitored condition, not automatically to a failed component.
Diagnostic approach
The researched cases used checks including Inspect Y94/2 electrical connection; Observe battery voltage during cranking; FPCM inputs and output. A technician must interpret the results in the context of the actual vehicle.
The recorded case findings included Connector backed out; Voltage dropped heavily; Ground, CAN and 12-V supply good; no pump output. These findings are examples, not assumptions to apply to every Mercedes-Benz.
Documented causes in the source cases included Backed-out fuel-volume-regulator connector; Battery failed under cranking load; Failed fuel-pump control module. Similar symptoms can result from other faults, so testing is needed before repair.
Reported successful case repairs included Tightened crimps and secured connector; normal starting and running resumed; Installed new battery; vehicle then cranked and started every time; Replaced FPCM; car started immediately with no further issues. These are external research outcomes, not work claimed by our shop.
If you are experiencing similar symptoms, call Mich’s Foreign Cars in Hickory at 828-324-6012 with the vehicle year, engine, warning message and the conditions under which the problem occurs.