What Does B1219 Mean?
B1219 indicates the body control module (BCM) or powertrain control module (PCM) has detected an electrical fault in the fuel tank pressure sensor circuit. This sensor monitors vapor pressure in the fuel tank as part of the evaporative emissions control system. The control module has identified voltage readings outside the expected range, indicating an open circuit, short circuit, or sensor malfunction.
Common Causes
45%
Faulty fuel tank pressure sensor with internal circuit failure or contamination
30%
Damaged wiring harness or corroded connector at the fuel tank pressure sensor
15%
Poor ground connection or broken ground wire in the sensor circuit
10%
BCM or PCM internal circuit fault on the sensor input channel
Diagnostic Steps
1
Step 1: Perform a visual inspection of the fuel tank pressure sensor connector and wiring harness for corrosion, damaged pins, moisture intrusion, or chafed wires, especially near the fuel tank mounting area
2
Step 2: Using a digital multimeter, backprobe the fuel tank pressure sensor connector with key on/engine off and verify reference voltage (typically 5V) and ground (0V) at the sensor connector
3
Step 3: Disconnect the fuel tank pressure sensor and measure its resistance across the signal and ground terminals (typical range 1-5k ohms depending on manufacturer); compare to specifications and check for open or short circuit
4
Step 4: Inspect and test the continuity of all three wires (signal, reference voltage, and ground) from the sensor connector back to the BCM/PCM connector using wiring diagrams; check for resistance above 5 ohms indicating a poor connection
5
Step 5: If all wiring and connections test good, replace the fuel tank pressure sensor and clear codes; perform a fuel tank pressure sensor rationality test using scan tool active tests or drive cycle to verify proper operation
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
B1219 indicates the body control module (BCM) or powertrain control module (PCM) has detected an electrical fault in the fuel tank pressure sensor circuit. This sensor monitors vapor pressure in the fuel tank as part of the evaporative emissions control system. The control module has identified volt...
The most common cause of B1219 (Fuel Tank Pressure Sensor Circuit Failure) is: Faulty fuel tank pressure sensor with internal circuit failure or contamination
Typical repair costs for B1219 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive, but may experience evaporative emissions system issues including failed emissions testing and potential fuel vapor odors. Repair within 1-2 weeks to prevent secondary EVAP system problems and ensure emissions compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1219 to identify the root cause.
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Quick Info
Category
Body
System
Evaporative Emissions Control System
Difficulty
Type
Manufacturer
Recommended Tools
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