Powertrain, generic (extended)

P2A62 Alternative Fuel Tank B Level Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2A62 is set when the tank B level signal climbs above the highest voltage a working sender delivers at full. For its dual-tank propane trucks Roush blames the high case on a disconnected sender or a wire shorted to more than 5 V, and with the second-tank code P2068 the gauge again falls back to the primary tank only. A broken ground at the sender gives the same picture on most pull-up inputs. The risk is the opposite of P2A61: if the reading were accepted, tank B would look full while it empties, so the module discards it. No manufacturer documents P2A62 itself. Check that the plug at the tank B sender is seated and locked, then test ground continuity before replacing the sender.

Likely causes

Tank B sender unplugged or wire open

Sender ground interrupted

Signal wire shorted to a voltage above 5 V

Symptoms

Check engine light
Gauge shows only the primary tank
Content of tank B unknown to the driver

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 b level sensorwiring harnessafcm

Related codes

P2A5F P2A61 P2A63 P2A67 P01B2 P2068

References: law.cornell.edu, roushcleantech.com.