Fuel Level Sensor Circuit Open
The B1202 code indicates that the instrument cluster (IC) or body control module (BCM) has detected an open circuit in the fuel level sensor signal. This means the circuit resistance is above the calibrated maximum threshold (typically indicating an empty tank or broken wire), preventing accurate fuel level reading.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty fuel level sensor (fuel pump/sender unit) or stuck float
- Open circuit in the signal wire between the sensor and the IC/BCM
- Open or high-resistance ground circuit for the sensor
- Corroded, loose, or disconnected connector at the fuel tank
- Internal failure of the instrument cluster module
3. Symptoms You Will Notice
- Incorrect or erratic fuel gauge reading
- Fuel gauge stuck on empty or full
- Check Engine Light or warning message on the dash
4. Step-by-Step Diagnosis
Scan for codes and verify B1202 is present
Inspect fuel tank connector for corrosion, damage, or looseness
Test fuel level sensor resistance at the connector (should vary with float position)
Check for continuity in signal and ground wires between sensor and module
If wiring is good, test the instrument cluster or BCM for internal faults
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but you may not have an accurate fuel gauge, risking running out of fuel.
How much does it cost to fix?▼
Repair costs typically range from $150 to $500, depending on whether the sensor, wiring, or module needs replacement.