B0704 Trouble Code

View B0704 obd/2 error code description and symptoms.

Low Speed Fuel Pump Primary Circuit Malfunction The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM.
The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit). Open or shorted low fuel pump (LFP) circuit Open VPWR to low speed fuel pump relay Damaged low speed fuel pump relay Damaged PCM An open circuit or short to ground can only be detected with the low speed fuel pump.

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code B0704, so consult the manual to locate the brake fluid reservoir. Bear in mind that a low fluid level can set code B0704 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.

Difficulty Level (Soso)

Repair Time (50 Min.)

Cost Prediction : $ 40-75

B0704 Error Code Repair Process :

If your elc system 2 fault check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system B0704 and engine control unit are in charge of monitoring a bunch of different elc system 2 fault, and if they get a reading that's a little out of whack, up pops the check engine light.

B0704 is a kind of Body Trouble Code Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

Common Causes of B0704

A common cause of code B0704 is the failure of ELC System 2 Fault, but there are several other possible causes as well, such as ;

• EVAP canister or fuel tank leaks
• Faulty select solenoid
• Ignition misfiring
• Damaged ECM

B0704 code for all cars

You can view according B0704 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+B0704 Audi Tt

+B0704 Borgward 2400

+B0704 Hyundai Hcd

+B0704 Chevrolet Corsica

+B0704 Steyr 500

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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