C0938 Trouble Code

View C0938 obd/2 error code description and symptoms. C0938 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.

A good starting point in your diagnosis is checking all system fuses and fusible links. This can be done using the DVOM on the voltage setting. You will want to test the fuses with circuits loaded. Some fuses will appear normal until a load is placed on their respective circuit; at which point they will fail. This has been the cause of many 'phantom malfunctions'. Consult your vehicle information source for fuse and fusible link locations. If all fuses are in working order, you may want to check TCM relay operation by swapping identical relays. Usually the horn relay, starter relay, fuel pump relay, air conditioning clutch relay, and controller relays are similar enough in design to swap for diagnostic purposes.

Difficulty Level (Expert)
Level
Repair Time (60 Min.)
Time
Cost Prediction : $ 80-120

C0938 Error Code Repair Process :

If your speed wheel sensor rf input short circuit to ground 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 C0938 and engine control unit are in charge of monitoring a bunch of different speed wheel sensor rf input short circuit to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Wrench Tool C0938 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C0938

A common cause of code C0938 is the failure of Speed Wheel Sensor RF Input Short Circuit To Ground, but there are several other possible causes as well, such as ;

C0938 code for all cars

You can view according C0938 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C0938 Berkeley B +C0938 Aston Martin V12 Vanquish +C0938 Mazda Roadpacer +C0938 Chevrolet Model +C0938 Alfa Romeo 2900

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