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B1212 is a diagnostic trouble code (DTC) for "EIC Switch-2 Assembly Circuit Short To Ground". 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.
The B1212 indicates that a related control module has detected that the Switch 2 assembly circuit in the dashboard electronic instrument cluster (EIC) has been shorted.
Some modern vehicles have an EIC, which is an electronic equivalent to analog dashboard indicators. In the case of a shorted circuit, a much higher than usual burst of electricity will surge through the circuit, potentially damaging fuses and wiring.
A B1212 code is typically the result of wiring issues related to the EIC's Switch 2 assembly circuit. Electrical connectors and wiring alike may be corroded, disconnected, or damaged due to external forces, such as damage from liquids. Blown fuses often accompany a B1212 code. Although blown fuses may not account for the initial registered code, they will need to be repaired accordingly before the code is properly resolved.
The electronic dashboard will typically be disabled or act erratically in the case of a verified B1212 scenario. Blown fuses may cause other related systems to fail as well. For the sake of diagnosing the problem, the vehicle computer will log a B1212 trouble code. Although an illuminated trouble indicator request may be sent to the dashboard, if the EIC is compromised it is not likely that it will go through.
A mechanic can diagnose the B1212 trouble code by inputting the vehicle computer with an OBD-II code reader. A voltmeter or Autohex scanner can be used to pinpoint the source of the short damage along the circuit. In addition, any fuses or components related to the shorted circuit should be examined for signs of damage caused from the overload.
For safety reasons, all shorted wiring should be handled with the power off.
Blown fuses often accompany a shorted circuit. Blown fuses may be overlooked as a secondary cause of the B1212 issue.
Because the B1212 code compromises the EIC, all dashboard data, including the speedometer, may be disabled. Although this technically doesn't affect the vehicle's drivability, not knowing your vehicle's speed or fuel level is not preferable if driving. It is strongly recommended that this issue be fixed before taking the vehicle to the road.
The wiring related to the electronic instrument cluster should be thoroughly examined with the fuse power off. Any disconnected, corroded, broken or damaged wiring should be repaired or replaced accordingly. Any fuses or components that were blown during the short circuit should be replaced as necessary. Following repairs for the B1212 code, the vehicle should be started up to see if the EIC will light up properly.
The vehicle's manual may offer more specific guidance on how to address a B1212 trouble code.
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