The P2149 code on your 2021 Acura TLX indicates a problem with the fuel injector group B supply voltage circuit. This code affects your TLX's 2.0L turbocharged 4-cylinder or 3.0L V6 engine's fuel injection system, signaling an open circuit in the power supply to the second group of fuel injectors.
Understanding P2149 on Acura TLX
Similar to P2146 for Group A, code P2149 indicates an open circuit in the power supply for injector Group B. This typically affects the opposite bank of cylinders or complementary set of injectors. Without power, these injectors cannot operate, causing partial engine operation.
Common Symptoms
- Check engine light on
- Severe misfire condition
- Engine runs rough or shakes
- Major power loss
- Strong gasoline odor
- Possible engine stalling
- Catalytic converter damage risk
Primary Causes
- Blown Group B injector fuse
- Open in injector power supply wiring
- Failed injector causing circuit overload
- Damaged wiring harness to Group B injectors
- Corroded connector terminals
- ECM/PCM driver circuit failure
- Relay failure if equipped
Diagnostic Procedure for 2021 Acura TLX
Check the injector fuse for Group B circuit first. Using a voltmeter, check for battery voltage at each Group B injector connector with key on. No voltage indicates the power supply path is broken. Trace from connector back through wiring, relay (if equipped), fuse, and to the ECM. Test injector resistance to identify if a shorted injector caused the circuit failure.
Repair Solutions
Replace blown fuse after identifying the cause. Repair open circuits in the power supply wiring. Replace damaged harness connectors. If an injector is shorted (very low resistance), replace that injector before restoring power. Clear codes and verify all Group B injectors receive power and fire correctly during operation.