Powertrain, generic (extended)

P2A61 Alternative Fuel Tank B Level Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2A61 is stored when the tank B level signal falls below the smallest voltage the sender produces even with the tank empty. Roush's manual for its dual-tank propane trucks names a sender wire shorted to ground or a damaged sender as causes of the low case and adds that the second-tank code P2067 leaves only the primary tank on the gauge. A Hall-type float module with ratiometric output, such as Rochester's for LPG tanks, can also read low when its supply voltage is missing. The driver sees tank B as empty or ignored, and the usable range on gas appears shorter than it is. No manufacturer documents P2A61 itself. Check for chafed wiring near the tank mounting first, then measure supply and ground at the sender.

Likely causes

Sender signal wire of tank B shorted to ground
Tank B sender damaged
Supply voltage of a Hall-type sender missing

Symptoms

  • Check engine light
  • Tank B shown empty or left out of the gauge
  • Shorter displayed gas range

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

P2A5FP2A62P2A60P2A66P01B1P2067

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