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B1203 is a diagnostic trouble code (DTC) for "Fuel Sender Circuit Short To Battery". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A B1203 diagnostic trouble code indicates that the fuel tank sender circuit has shorted.
The fuel sender uses varying levels of voltage to gauge the vehicle's fuel levels. The insulation for the fuel sender may be faulty or wear to the point where electrical currents cross, resulting in a shorted circuit. This damage will make it impossible for the fuel sender to report accurate fuel levels to the dashboard panel.
A B1203 code shorted circuit is usually a result from a fault in the wiring insulation. The fuel sender itself may also be defective.
In the case of a B1203 code, the fuel gauge may read as empty, regardless of the amount of fuel currently in the tank. The fuel gauge may also read as full regardless of fuel intake.
In addition, for the purpose of diagnosing the issue, the vehicle's onboard computer will log a B1203 code and the dashboard trouble light will be illuminated.
A mechanic can first diagnose the B1203 code by reading the vehicle's computer with an OBD-II code scanner. The actual tank level may be checked with a dipstick. The fuel sender itself should be examined for signs of fault. All wiring and circuitry relating to the fuel sender unit should be thoroughly inspected for signs of damage.
The tank should be inspected with the battery leads removed first, as fuel vapour is extremely flammable and a live battery may prove a risk.
A malfunctioning fuel sender will likely render the vehicle's fuel gauge inoperable. This code should be taken seriously and repaired as soon as is possible.
Drain the fuel tank before attempting any repairs. Below are fixes that should resolve the B1203 code:
Body-related trouble codes are specific to particular models of vehicle. The meaning of a B Class trouble code will depend on the make and manufacturer. Refer to the vehicle manual if you're unclear on whether a given code description pertains to your model.
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