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B1967 OBD-II Trouble Code: AC Post Heater Sensor Circuit Short to Ground

diagnostic check engine light

B1967 code definition

The B1967 trouble code signals a circuit malfunction from the AC heater sensor.

What the B1967 code means

The B1967 code is a standard OBD-II trouble code that detects an AC heater sensor circuit error. The heater sensor is in the climate control system, and is essentially a temperature sensor. As air is passed through the AC evaporator, the heater sensor detects the temperature, and relays that information to the climate control module, so that the AC air flow can be altered to reach the desired temperature as it enters the cabin. If the climate control module, body control module, or powertrain control module (PCM) detect an abnormal voltage reading, or no reading at all from the AC heater sensor, then the B1967 trouble code might be triggered.

What causes the B1967 code?

The B1967 trouble code is most commonly caused by damaged or defective electrical parts. Shorted wires, blown fuses, and loose connectors in or between the AC heater sensor and climate control module can all cause this code. The B1967 code is also commonly caused by a malfunctioning AC heater sensor. It is also possible for a defective climate control module to trigger the code, though this is fairly rare.

What are the symptoms of the B1967 code?

The B1967 trouble code will usually be accompanied by an illuminated check engine soon warning light on the instrument panel, as well as a flashing AC light on the center console. In most cases, the air conditioner will not work properly, which may result in a lack of cold air, or erratic temperatures. It is also possible that the climate control system will fail completely.

How does a mechanic diagnose the B1967 code?

The B1967 code will be diagnosed with the help of a standard OBD-II trouble code scanner. A trained technician will assess the code by viewing the freeze frame data from the scanner, and will also utilize the scanner to see if any additional trouble codes have been detected. If there are numerous codes present, then they will need to be diagnosed in the order that they appear in. The trouble codes will then be reset, the vehicle restarted, and the code checked for. If the code is no longer detected, then it was likely triggered erroneously, or represents an intermittent issue.

If the code remains detected, then the mechanic will visually inspect the electrical components in the climate control system, and replace any wires, connectors, or fuses that are damaged or compromised. Next, the AC heater sensor will be checked, and then the climate control module will need to be inspected.

Whenever a repair or replacement is made, the trouble codes will again be reset, the vehicle restarted, and the code checked for. This will allow the mechanic to know as soon as the problem is resolved.

Common mistakes when diagnosing the B1967 code

The most common error when diagnosing the B1967 trouble code is the failure to abide by the OBD-II diagnosis protocol. It’s very important that the protocol be followed step by step in every diagnosis, as this helps ensure thorough inspections and accurate repairs.

Fully operational AC heater sensors and climate control modules are often inaccurately condemned because electrical issues were overlooked.

How serious is the B1967 code?

The B1967 trouble code does not present any drivability issues, but it likely will result in a faulty air conditioning system. The air conditioner temperature may be erratic, or simply not cold at all, and the climate control system may fail entirely. These failures can cause issues and even be dangerous if the vehicle is driven in extreme temperatures. As soon as the B1967 trouble code is detected, an inspection should be scheduled.

What repairs can fix the B1967 code?

Repairs for the B1967 trouble code include:

Additional comments for consideration regarding the B1967 code

The B1967 trouble code is a manufacturer specific code, which means that the definition changes depending on the manufacturer. While this code detects an AC heater sensor circuit malfunction in certain vehicles, it represents a completely different body problem for other makes and models. It’s important that technicians always take into account the vehicle they are working on when diagnosing the B1967 code.

Need help with a B1967 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
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