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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE B1212 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1212 code

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE B1212 DIAGNOSTIC Get a fair and transparent estimate upfront

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 1-800-701-6220.

trouble codes
B1212
OBD-II

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE B1212 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,796

Rating Summary
4,411
187
47
28
123
4,411
187
47
28
123

Matthew

31 years of experience
633 reviews
Matthew
31 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Williamsburg, Virginia
MATT WAS AMAZING! HE EXPLAINTED EVERYTHING SO WELL! HIS EXPERTISE AS A MECHANIC IS EVIDENT AND I HIGHLY RECOMMEND HIM.

Mario

18 years of experience
101 reviews
Mario
18 years of experience
Lexus LS430 - Check Engine Light is on - Naples, Florida
NICE GUY, COMPLETED ALL WORK PROFESSIONALLY, HE ACTUALLY OFFERED SUGGESTION AND ATTITUDE WAS THAT HE CARED UNLIKE PAST MECHANIC

Kai

12 years of experience
3 reviews
Kai
12 years of experience
Hyundai Sonata - Check Engine Light is on - Plano, Texas
Great. He was knowledgable and wasted no time getting to work. Had lots of helpful information for me

Patrick

31 years of experience
1038 reviews
Patrick
31 years of experience
Mazda CX-7 - Check Engine Light is on - Austin, Texas
Patrick is always on time and extremely knowledgeable and professional. I am quite picky when it comes to somebody working on my car and I fully trust that Patrick will do an excellent job every time.

More related articles

P0345 OBD-II Trouble Code: Camshaft Position Sensor A Circuit Malfunction (Bank 2)
Trouble code P0345 means the computer has detected an incorrect voltage reading from the bank 2 camshaft position sensor.
P0264 OBD-II Trouble Code: Cylinder 2 Injector Circuit Low
P0264 P0264 code definition Cylinder 2 Injector Circuit Low What the P0264 code means This diagnostic trouble code indicates that the powertrain control module has detected a lower reference voltage from the fuel injector on the number 2 cylinder than...
P0821 OBD-II Trouble Code: Gear Lever X Position Circuit
P0821 code means that a defect in the transmission shift mechanism range circuit has been detected due to a failed sensor or a locked solenoid.

Related questions

Why would I have a P0014 code in my 2008 Nissan 350Z

Hello. When you get this code it is because the computer is seeing that the valve timing is off. Most of the time this is a timing solenoid issue. It can also be caused by low engine oil, a sensor...

Where is the plug in for the code reader? 2013 Honda Civic

I am working on this

wont go faster 35mph

If the Check Engine Light is on this would be helpful as the codes that would be triggered by this would generate useful information relating to the problem. Without the benefit of hooking the car up to a scanner and...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com