Skip the auto shop - Our mechanics make house calls

P2671 OBD-II Trouble Code: Actuator Supply Voltage B Circuit High

check engine light

P2671 Trouble Code definition

A P2671 code indicates a fault in the B circuit’s actuator supply, detected by the PCM or another control module, such as:

  • body control module
  • alternative fuel control module
  • antilock brake control module
  • instrument panel control module
  • fuel injection control module
  • anti-theft module
  • cruise control module
  • traction control module
  • proximity alert module
  • climate control module

What a P2671 Code Means

An actuator supply voltage B malfunction means a trouble code has been stored and a Malfunction Indicator Lamp (MIL) or Check Engine Light may be illuminated. This code applies to all manufacturers. Sometimes, multiple drive cycles may be needed for the MIL to illuminate.

Causes of P2671 Code

A P2671 code is often caused by :

Symptoms of P2671 Code

Diagnosing a P2724 Code

The code is in reference to the actuator voltage signal from/to various engine control actuators(CAN). CAN is an abbreviation for ‘controller area network,” a communications bus between multiple microcomputers without a host computer being needed, a system designed specifically for automotive applications. The CAN bus is a network of wiring harnesses and connectors used to share information between automotive control modules, and controls practically every electronic function in the vehicle, along with the PCM.

  • A specialized scanner such as Autohex or Tech II may prove more useful in tracking down the specific malfunction than using a code reader and ohmmeter.

  • Use a memory saving device in case the PCM or other controllers lose memory and would require reprogramming

  • Specialized CAN scanners are available for diagnostics, showing pin values and control module operation and conditions. These scanners can give accurate real-time information while the vehicle is being operated.

  • Control module ground circuits will need to be tested for continuity with battery ground.

  • Check for any loose or dangling ground cables, straps or wires for the engine or transmission, from any recent repair work.

  • Look for corroded or loose electrical connectors that might cause a code to be stored due to increased circuit resistance. When you’ve narrowed it down, find a CAN bus system wiring diagram and use a volt ohmmeter to check continuity between connectors. Compare findings against manufacturer’s specs and repair open or shorted connections if needed.

Additional Considerations for P2671 Code

CAN systems are extremely complex, some with up to 18 separate control modules. All it can take is one misplaced probe to destroy expensive control modules and require a complete reprogramming of the vehicle. Due to the complexity of these systems, it’s advisable that repairs to correct a P2671 code be left to experienced, qualified techs with the proper tools for diagnosis and repair. Diagnosing and repairing a P2671 code with a digital volt-ohmmeter, for example, would require testing hundreds or thousands of individual circuits separately.

Need help with a P2671 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...


Related questions

Q: Check Engine Light came on. Car also has problems cranking but only when I refill it with gas.

Hi there - the first thing to do is extract the problem code(s) which are setting the "Check Engine" light. This will more efficiently direct resolution of the problem. Evaporative emission system problems are often associated with "fill-up" issues like...

Q: Heater will not stay hot

Hello. You are likely facing multiple issues at once. The low coolant would absolutely cause the heater to function intermittently. If you are continuously losing coolant there is likely a leak on the system and it will need to be...

Q: Lights on in the dash

The most likely cause of this issue would be a failed wheel speed sensor. This sensor usually comes as a unit with the hub assembly on these vehicles and is actually a common problem on many GM vehicles. The repair...