B0120 — Fluid Reservoir Level Sensor E

What Does B0120 Mean?

B0120 is a diagnostic trouble code indicating: Fluid Reservoir Level Sensor E. This code relates to the body electrical system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of B0120

⚠️ Check Engine Light (MIL) illuminated
⚠️ Fluid Reservoir Level Sensor E not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Interior or exterior lighting malfunction

Common Causes

🔍 Faulty Fluid Reservoir Level Sensor E
🔍 Wiring or connector issue in Fluid Reservoir Level Sensor E circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does B0120 mean?

B0120 indicates: Fluid Reservoir Level Sensor E. The vehicle's computer has detected that the Fluid Reservoir Level Sensor E is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code B0120?

Yes, B0120 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix B0120?

Repair costs for B0120 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Fluid Reservoir Level Sensor E and related wiring
🔧 Replace faulty Fluid Reservoir Level Sensor E

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

B0120: Fluid Reservoir Level Sensor E