What Does P2150 Mean?
The PCM detects abnormally low voltage in the power supply circuit for fuel injector group B. Voltage is present but below the threshold required for proper injector operation.
Safety Warning
Reduced engine power and rough running may occur, potentially causing stalling in traffic. Extended operation can damage the catalytic converter.
Common Causes
40%
High resistance in wiring or corroded connections reducing voltage to injectors
25%
Weak or failing fuel injector relay with high internal resistance
20%
Partially shorted fuel injector creating excessive current draw
15%
Poor ground connection for injector group B circuit
Diagnostic Steps
1
Step 1: Measure voltage at injector group B connector with key on, engine off (should be near battery voltage)
2
Step 2: Perform voltage drop test across injector power supply circuit while cranking engine
3
Step 3: Check all ground connections for injector group B circuit for corrosion or looseness
4
Step 4: Test injector relay operation and check for voltage drop across relay contacts
5
Step 5: Measure individual injector resistance and compare to specifications to identify shorted injectors
Estimated Repair Cost
$80 - $700
Parts + labor, varies by vehicle and location
The PCM detects abnormally low voltage in the power supply circuit for fuel injector group B. Voltage is present but below the threshold required for proper injector operation.
The most common cause of P2150 (Fuel Injector Group "B" Supply Voltage Circuit Low) is: High resistance in wiring or corroded connections reducing voltage to injectors
Typical repair costs for P2150 range from $80 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced engine power and rough running may occur, potentially causing stalling in traffic. Extended operation can damage the catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2150 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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