B240B Engine Trouble Code
What is B240B?
With B240B, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B240B |
B240B 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
B240B Code Structure
Understanding what each digit means in the B240B body trouble code:
| B | 2 | 4 | 0 | b |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | O2 Sensor Heater Circuit Malfunction | Cold Start Injector 1 Malfunction | System Malfunction |
How to Fix B240B
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on B240B DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
B240B Description
B240B engine trouble code is related to System Malfunction.
Main Cause
The primary reason for B240B OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.