What Does P2671 Mean?
The ECM has detected voltage in the "B" actuator supply circuit that exceeds the maximum threshold. This abnormally high voltage can damage electronic actuators and indicates a problem with voltage regulation or feedback in the circuit. May indicate a short to voltage or failed voltage regulator.
Safety Warning
High voltage can damage multiple engine control components and may cause sudden engine shutdown or fire risk. Should not be driven until repaired.
Common Causes
35%
Short to battery voltage in actuator supply wiring harness
25%
Failed actuator power relay stuck in closed position
20%
Faulty voltage regulator or alternator overcharging
15%
ECM internal driver circuit failure causing voltage feedback
5%
Crossed circuits or wiring fault causing voltage backfeed
Diagnostic Steps
1
Step 1: Check charging system voltage with engine running; should not exceed 15V under any condition
2
Step 2: Disconnect actuator supply relay "B" and check if voltage remains present on supply circuit
3
Step 3: Inspect wiring harness for damage or shorts to other power circuits, particularly near alternator and battery cables
4
Step 4: Monitor actuator supply voltage with scan tool during key on/engine off and running conditions
5
Step 5: Test alternator voltage regulation under load; replace if output exceeds 15 volts
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ECM has detected voltage in the "B" actuator supply circuit that exceeds the maximum threshold. This abnormally high voltage can damage electronic actuators and indicates a problem with voltage regulation or feedback in the circuit. May indicate a short to voltage or failed voltage regulator.
The most common cause of P2671 (Actuator Supply Voltage "B" Circuit High) is: Short to battery voltage in actuator supply wiring harness
Typical repair costs for P2671 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
High voltage can damage multiple engine control components and may cause sudden engine shutdown or fire risk. Should not be driven until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2671 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
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