B1947 – OBD-II DTC

OBD-II DTC B1947 – Climate Control A/C Post Evaporator Sensor Circuit Short To Ground

DTC B1947 meaning

DTC B1947 refers to a diagnostic trouble code indicating a short circuit to ground in the Climate Control A/C Post Evaporator Sensor Circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle systems for faults. The post evaporator sensor is responsible for measuring the temperature of the air after it passes through the evaporator, helping to regulate the air conditioning system’s performance.

DTC B1947 symptoms

Common symptoms associated with DTC B1947 may include:

• Inconsistent or inadequate cooling from the A/C system
• Increased humidity inside the vehicle
• Unusual noises from the A/C system
• Dashboard warning lights related to the climate control system

DTC B1947 causes

Several factors can lead to the triggering of DTC B1947, including:

• Wiring issues, such as damaged or frayed wires
• Faulty post evaporator temperature sensor
• Corrosion or poor connections in the sensor circuit
• Short circuits caused by moisture intrusion or foreign objects

DTC B1947 seriousness

DTC B1947 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s drivability, it can lead to inefficient A/C performance, which can be uncomfortable for passengers. Additionally, ignoring this code may result in further damage to the A/C system or related components.

How to diagnose DTC B1947

To diagnose DTC B1947, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the wiring and connectors associated with the post evaporator sensor for any visible damage.
3. Check for continuity in the sensor circuit to identify any breaks or shorts.
4. Test the post evaporator temperature sensor using a multimeter to ensure it operates within specifications.
5. Clear the code and perform a road test to see if the code returns.

How to fix DTC B1947 step-by-step instructions

To fix DTC B1947, follow these steps:

1. Inspect and repair any damaged wiring or connectors in the sensor circuit.
2. Replace the post evaporator temperature sensor if it is found to be faulty.
3. Ensure all connections are clean and secure to prevent corrosion.
4. Clear the DTC using an OBD-II scanner.
5. Test the A/C system to ensure proper operation and monitor for any return of the code.

How to erase DTC B1947

To erase DTC B1947, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to indicate that the codes have been cleared.
5. Disconnect the scanner and perform a test drive to ensure the code does not return.

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