B3143 Engine Trouble Code
What is B3143?
When B3143 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B3143 |
B3143 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
B3143 Code Structure
Understanding what each digit means in the B3143 body trouble code:
| B | 3 | 1 | 4 | 3 |
|---|---|---|---|---|
| Body Code | Ignition System Or Misfire | Fuel Rail/System Pressure — Too High | Injection Pump Fuel Metering Control 'B' High | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix B3143
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
B3143 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
B3143 Description
B3143 engine trouble code is related to Exhaust Gas Recirculation Sensor B Circuit High.
Main Cause
The primary reason for B3143 OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.