B2739 Engine Trouble Code
What is B2739?
The B2739 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B2739 |
B2739 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
B2739 Code Structure
Understanding what each digit means in the B2739 body trouble code:
| B | 2 | 7 | 3 | 9 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Rail Pressure Sensor Circuit Malfunction | Injection Pump Fuel Metering Control 'A' High | Reverse Input Circuit |
How to Fix B2739
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on B2739 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
B2739 Description
B2739 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for B2739 OBD-II Engine Trouble Code is: Fuel Rail Pressure Sensor Circuit Malfunction.