B1156 Engine Trouble Code
What is B1156?
The B1156 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: | B1156 |
B1156 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
B1156 Code Structure
Understanding what each digit means in the B1156 body trouble code:
| B | 1 | 1 | 5 | 6 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | Fuel Rail/System Pressure — Too High | Cylinder 1 Injector Circuit Low | Ignition Coil A Primary/Secondary Circuit Malfunction |
How to Fix B1156
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:
A/C pressure sensor monitors refrigerant pressure changes. DTC sets when pressure change falls outside calibration. Verify A/C system function, refrigerant charge, and electrical connections.
Technical Notes:
For B1156, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
B1156 Description
B1156 engine trouble code is related to Ignition Coil A Primary/Secondary Circuit Malfunction.
Main Cause
The primary reason for B1156 OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.