Skip the auto shop - Our mechanics make house calls

B1212 OBD-II Trouble Code: EIC Switch-2 Assembly Circuit Short To Ground

diagnostic check engine light

B1212 code definition

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.

What the B1212 code means

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.

What causes the B1212 code?

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.

What are the symptoms of the B1212 code?

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.

How does a mechanic diagnose the B1212 code?

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.

Common mistakes when diagnosing the B1212 code

Blown fuses often accompany a shorted circuit. Blown fuses may be overlooked as a secondary cause of the B1212 issue.

How serious is the B1212 code?

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.

What repairs can fix the B1212 code?

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.

Additional comments for consideration regarding the B1212 code

The vehicle's manual may offer more specific guidance on how to address a B1212 trouble code.

Need help with a B1212 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Car jerking with flashing check engine light.

If your Check Engine Light is flashing, you need to stop driving it until it is fixed. A flashing Check Engine Light is warning you that there is a fire danger because there is to much raw fuel entering the...

Q: Does the OBD system use more than lights to communicate with the driver?

Malfunction Indicator Lamps (MIL) and audible alarms are currently the only means by which the On-Board Diagnostics (OBD) system can inform the driver of any issues that adversely affect the operation of the engine or other electronically controlled system. The...

Q: My problem is Check Engine Light on. Cruise control does not work, loses power on hills, as if it does not want to pull hill.

Hi there. From the description you have provided, there is several possibilities for your vehicle's drivability problems. Your vehicle's Check Engine Light may help diagnose the lack of power and inoperative cruise control. Accessing the vehicle's computer for codes stored,...