Skip the auto shop - Our mechanics make house calls

B1200 OBD-II Trouble Code: Climate Control Pushbutton Circuit Failure

diagnostic check engine light

B1200 code definition

The B1200 diagnostic trouble code refers to a reported electrical failure in one or more of the climate control system's pushbuttons.

What the B1200 code means

The climate control system regulates air and temperature within the vehicle cabin, including heating and air conditioning. A B1200 trouble code is logged on the vehicle's computer if one or more of the pushbuttons fails to send an input to the climate control system.

What causes the B1200 code?

The most common cause for a B1200 code is a faulty or damaged pushbutton. The pushbuttons may be damaged if liquids have been spilled on the faceplate. Faulty wiring within the climate control system may also be to blame for a B1200 code.

What are the symptoms of the B1200 code?

Quite simply, if there is a malfunction with the climate control pushbutton circuit, one or more of the buttons will cease to work. In the case of a B1200 code, the climate control system should be considered disabled or at least unreliable.

In addition, for the sake of diagnosing the problem, the dashboard trouble lamp will be illuminated and the B1200 code logged on the vehicle's computer.

How does a mechanic diagnose the B1200 code?

The B1200 code can be diagnosed first by inputting into the vehicle's powertrain control module with an OBD-II code reader and scanning for the code. The climate control system should be tested in order to verify the code. Testing each of the buttons and verifying which buttons aren't functioning may help identify the problematic area of the circuit.

The climate control face should be unscrewed in order to allow access to the circuit panels. Any wiring related to the climate control system and pushbutton circuit should be inspected thoroughly for signs of disconnection, corrosion, damage and/or defection. A voltmeter should be used on different parts of the pushbutton circuit in order to pinpoint the disconnection.

Common mistakes when diagnosing the B1200 code

Components are sometimes mistakenly replaced instead of repairing faulty wiring. Replacing otherwise good components will do nothing to solve the issue.

If you purchase a new pushbutton climate control unit, you should refer to your vehicle's parts manual for the sake of reference. Make sure it fits with the specific make of your vehicle before ordering.

How serious is the B1200 code?

A B1200 trouble code won't affect the vehicle's drivability. The climate control system should be considered effectively disabled however. This may significant cause for concern if you are operating your vehicle in extreme weather conditions.

What repairs can fix the B1200 code?

Repairs for the B1200 code may include:

  • Repairing or replacing components in the climate control system
  • Repairing faulty or broken wires connected to the pushbutton circuit
  • Pushbutton replacement

Additional comments for consideration regarding the B1200 code

The B1200 trouble code is generic. This means that the specific parameters may change depending on the manufacturer and model of the vehicle in question.

Need help with a B1200 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

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...


Related questions

Q: P0755 & P0700 error codes

The problem with buying used tires and not having them balanced is the potential problems they can cause. Most transmissions - or more specifically, the Powertrain Control Module (PCM) which controls the transmission and drive line - contain incredibly...

Q: Car cranks but won't turn over

Hello. This problem could be caused by several different things. You could be out of gas, the fuel pump might be working properly, the timing belt could be broken, there could be an issue with electricity getting to your spark...

Q: I got code P0016 and P0008. I just want to know what caused the problem and which one is bank 1 sensor A?

Hello, this problem (both codes apply to the same problem) relates to a calculated "bad timing correlation" between the crankshaft and the exhaust camshaft for cylinder 1 (cylinder head at front of the car). Engine management has tolerances for the...