The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code B3840
Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code B3840, so consult the manual to locate the brake fluid reservoir. Bear in mind that a low fluid level can set code B3840 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)
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Repair Time (50 Min.)
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| Cost Prediction : $ 40-75 |
If your accessory delay relay coil circuit short to battery 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 B3840 and engine control unit are in charge of monitoring a bunch of different accessory delay relay coil circuit short to battery, and if they get a reading that's a little out of whack, up pops the check engine light.
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B3840 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. |
You can view according B3840 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +B3840 Talbot Tagora | +B3840 Dkw Universal | +B3840 Renault Altica | +B3840 Nissan Note | +B3840 Tvr Sagaris |
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