B2919 Code - Auxiliary Blower Motor Speed Input Circuit Short To Voltage
Quick Answer
Under normal operation, ground for the blower motor is provided through the circuit from the blower motor resistor (LO and MED-LO) and the blower motor speed relay 1 (MED-HI and HI). Common causes include Faulty Auxiliary Blower Motor Speed Relay 1, Auxiliary Blower Motor Speed Relay 1 harness is open or shorted, Auxiliary Blower Motor Speed Relay 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B2919 indicates Auxiliary Blower Motor Speed Input Circuit Short To Voltage.
- Common causes
- Common causes include Faulty Auxiliary Blower Motor Speed Relay 1, Auxiliary Blower Motor Speed Relay 1 harness is open or shorted, Auxiliary Blower Motor Speed Relay 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B2919 Description
In LO, ground for the blower motor is provided through the blower motor resistor.
In MED-LO, blower motor speed relay 2 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through one half of the blower motor resistor to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.
In MED-HI, blower motor speed relay 1 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through blower motor speed relay 2 to the circuit. The circuit is connected through one half of the blower motor resistor to the blower motor resistor ground circuit.
In HI, blower motor speed relays 1 and 2 are grounded by the SJB through the circuit. Blower motor ground circuit 515 (OG/RD) is connected through the blower motor speed relay 1 to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.
What are the Possible Causes of the DTC B2919?
- Faulty Auxiliary Blower Motor Speed Relay 1
- Auxiliary Blower Motor Speed Relay 1 harness is open or shorted
- Auxiliary Blower Motor Speed Relay 1 circuit poor electrical connection
- Faulty Blower Motor Resistor
- Faulty Smart Junction Box (SJB)
How to Fix the DTC B2919?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B2919 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- B2919 Ford — Auxiliary Blower Motor Speed Input Circuit Short To Voltage
- B2919 Lincoln — Auxiliary Blower Motor Speed Input Circuit Short To Voltage
- B2919 Mercury — Auxiliary Blower Motor Speed Input Circuit Short To Voltage
Frequently Asked Questions about B2919 Code
1. What does the OBDII code B2919 mean?
The B2919 code indicates an issue with the Auxiliary Blower Motor Speed Input Circuit, specifically a short to voltage.
2. What are the common symptoms of a B2919 code?
Symptoms may include the auxiliary blower motor not operating, reduced airflow, unusual noises, or erratic fan speed behavior.
3. What causes the B2919 code?
Common causes include a short circuit in the wiring, a faulty blower motor resistor, a damaged blower motor, or a malfunctioning control module.
4. Can I still drive my vehicle with a B2919 code?
Yes, but it may cause discomfort due to reduced or inconsistent HVAC performance and could lead to further electrical issues if not addressed.
5. How can I diagnose the B2919 code?
Check for damaged or shorted wiring, inspect the blower motor and resistor, and use a multimeter to test the circuit for proper voltage levels.
6. What tools are needed to fix the B2919 code?
You’ll need a multimeter, wiring diagram, basic hand tools, and potentially an OBDII scanner to clear the code after repairs.
7. How do I repair the B2919 code?
Repairs may involve replacing damaged wiring, the blower motor resistor, or the auxiliary blower motor, depending on the specific issue found during diagnosis.
8. What is the cost to fix a B2919 code?
Repair costs can vary but typically range from $100 to $300 for parts and labor, depending on the component needing replacement.
9. Can a blown fuse cause the B2919 code?
A blown fuse is not a typical cause of this code, but it’s worth checking the fuse box as part of the troubleshooting process.
10. Will clearing the B2919 code fix the problem?
No, clearing the code will not fix the underlying issue. The fault must be properly diagnosed and repaired to prevent the code from returning.
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