B0178 Trouble Code

View B0178 obd/2 error code description and symptoms. B0178 engine photo

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.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

B0178 Error Code Repair Process :

If your timing reference high resolution signal b intermittent/erratic pulses 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 B0178 and engine control unit are in charge of monitoring a bunch of different timing reference high resolution signal b intermittent/erratic pulses, and if they get a reading that's a little out of whack, up pops the check engine light.

B0178 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 B0178

A common cause of code B0178 is the failure of Timing Reference High Resolution Signal B Intermittent/Erratic Pulses, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Faulty Mass Air Flow (MAF) sensor
Dirty Oil
Exhaust tube

B0178 code for all cars

You can view according B0178 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+B0178 Chevrolet Metro

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