What Does P2149 Mean?
The PCM has detected an open circuit or electrical fault in the power supply circuit feeding fuel injector group B. This means injectors in bank 2 (typically cylinders on one side of a V-engine or specific cylinders on inline engines) are not receiving proper voltage.
Safety Warning
Vehicle may run rough, lose power, or fail to start if multiple injectors are not functioning. Continued operation may cause catalytic converter damage from unburned fuel.
Common Causes
35%
Open or corroded wiring in injector power supply circuit for group B
30%
Blown fuse or faulty injector driver relay for group B
20%
Failed PCM injector driver circuit internal to the computer
15%
Damaged or shorted fuel injector causing power circuit failure
Diagnostic Steps
1
Step 1: Check all fuses and relays related to fuel injector group B power supply
2
Step 2: Inspect injector harness connector at group B for corrosion, damage, or loose pins
3
Step 3: Use a multimeter to test for battery voltage at the injector power supply wire with key on, engine off
4
Step 4: Check continuity from injector power supply back to the fuse/relay and from injector ground back to PCM
5
Step 5: If power supply is intact, test individual injector resistance and compare to specifications
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or electrical fault in the power supply circuit feeding fuel injector group B. This means injectors in bank 2 (typically cylinders on one side of a V-engine or specific cylinders on inline engines) are not receiving proper voltage.
The most common cause of P2149 (Fuel Injector Group "B" Supply Voltage Circuit/Open) is: Open or corroded wiring in injector power supply circuit for group B
Typical repair costs for P2149 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may run rough, lose power, or fail to start if multiple injectors are not functioning. Continued operation may cause catalytic converter damage from unburned fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2149 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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