P2A79

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Unstable operation of the engine using alternative fuel
Check engine light comes on
Reduced engine power
Dips during acceleration
Increased fuel consumption

Causes

Damage to the wiring to the pressure sensor
Pressure sensor malfunction
Poor contact in connectors
Hydraulic pump problems
Short circuit in the sensor circuit

How to Fix

Check the integrity of the wiring to the sensor
Test the pressure sensor
Clean connector contacts
Check the operation of the hydraulic pump
Replace pressure sensor if necessary

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