Powertrain, generic (extended)

P2A64 Alternative Fuel Tank C Level Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

A third gas tank, C, may have its own level input, either a real float sender in an LPG vessel or, on CNG, a value the module derives from that tank's pressure, the way Ford's 2003 bi-fuel trucks turned tank pressure into a gauge reading. P2A64 reports that the tank C level circuit is faulty without saying whether the signal is too low or too high; P2A66 and P2A67 make that distinction. Even the petrol-based code set ends at a second sender, so there is no conventional analogue for a third tank, and no manufacturer documents P2A64. The effect is mostly informational: the gauge or range shown may leave out tank C. Inspect the sender plug and its wiring run, which on rear-mounted tanks is often long and exposed.

Likely causes

Long harness run to tank C damaged or plug loose

Tank C sender defective

Fault in the tank C pressure input the level is derived from (CNG)

Symptoms

Check engine light
Gauge or range leaves out tank C
Otherwise normal driving

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–700

Time0.5–3 h

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

Parts involved

alt fuel tank c level sensorwiring harnessafcm

References: law.cornell.edu, static.nhtsa.gov.