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Home / DTC / P00C6 — Fuel rail pressure very low - Engine turn

P00C6 — Fuel rail pressure very low - Engine turn

Detailed page for trouble code P00C6.

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Code

P00C6

LAND ROVER P — Powertrain

Fuel rail pressure very low - Engine turn

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Insufficient fuel supply (failed or weak fuel pump)
  • Clogged fuel filter or restricted feed/return line
  • Fuel leak on high-pressure rail or low-pressure side
  • Faulty fuel rail pressure sensor (FRP sensor)
  • Damaged wiring or poor connector to FRP sensor
  • Faulty fuel pressure regulator or relief valve (where applicable)

Symptoms

  • Difficult or no start / long cranking
  • Engine stalls or will not run after start
  • Rough/crank-only running
  • Reduced engine power or limp-home mode
  • Check Engine Light illuminated and stored P00C6 (and possibly related codes)
  • Possible fuel smell or audible pump issues

What to check

  • Read and record freeze frame data and all related codes with a capable scan tool
  • Use live data to monitor fuel rail pressure and FRP sensor voltage during key-on and cranking
  • Confirm fuel pump prime on key-on (listen/measure) and fuel pressure at the rail with a calibrated fuel pressure gauge where safe and applicable
  • Inspect fuel filter, feed and return lines, and fittings for restriction or leaks
  • Visually inspect FRP sensor connector and wiring for damage, corrosion, or poor pin contact
  • Check fuel pump fuse, relay and associated power/ground circuits

Signal parameters

  • FRP sensor output should vary with pressure — typical sensor output range about 0.5–4.5 V (refer to vehicle service manual for exact voltage-to-pressure mapping)
  • At key-on (engine off) the rail may show a low static pressure; during crank the rail pressure should rise toward manufacturer-specified cranking pressure — if it remains very low, supply or pump is suspect
  • Compare rail pressure and sensor voltage to the manufacturer's specified values for KOEO and during cranking

Diagnostic algorithm

  1. Connect a scan tool and capture freeze-frame and live data for fuel rail pressure and related parameters. Note other fuel-related codes.
  2. Attempt to crank while monitoring fuel rail pressure and sensor voltage. Confirm whether pressure rises at all and whether the sensor voltage follows it.
  3. Verify fuel pump operation on key-on (listen for prime). Check pump fuse and relay operation. Backprobe pump supply to confirm power during key-on and crank.
  4. Measure actual fuel pressure at the rail with an appropriate fuel pressure gauge (observe safety procedures). If pressure is very low or zero, continue to fuel supply tests.
  5. If no/low pressure: inspect/replace fuel filter, check for blocked feed line, check fuel tank pickup and suction strainer, and verify fuel pump flow and pressure at the source.
  6. If pump appears to run and pressure at pump outlet is good but rail pressure is low, inspect high-pressure pump (for diesel/common-rail) or pressure regulator and high-pressure lines for leaks or failures.
  7. If pressure gauge shows correct rail pressure but ECU still reports P00C6, backprobe FRP sensor connector and measure sensor supply voltage, ground and signal while cranking. Compare to expected values in service manual.
  8. If sensor wiring integrity or voltages are out of spec, repair wiring/connector and retest. If wiring good but sensor signal incorrect, replace the rail pressure sensor and retest.
  9. Clear codes and perform a full re-test including road test if necessary. If intermittent, consider extended monitoring or pressure transducer substitution for diagnosis.
  10. If all mechanical and sensor checks pass, consult manufacturer technical service information and consider ECU diagnostics or software updates.

Likely causes

  • Failed or intermittent fuel pump, especially if no prime or low feed pressure noted
  • Clogged inlet filter or fuel filter restricting flow
  • Wiring/connector fault at the fuel rail pressure sensor (corrosion, broken wire, short to ground)
  • Faulty fuel rail pressure sensor giving low/invalid signal

Fault status

⚠️ Status
Fuel rail pressure very low detected while the engine was turning (crank). This indicates inadequate rail pressure or an invalid rail pressure signal; vehicle may not start or run properly. Investigate fuel supply, high-pressure components, sensor wiring and FRP sensor.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1–4 hours

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