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.

This article originally appeared on YourMechanic.com as B1200 OBD-II Trouble Code: Climate Control Pushbutton Circuit Failure and was authored by Conor Fynes.


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