B2317 — Mirror Passenger Vertical Feedback Potentiometer Circuit Open #

Note: The code label and wording may vary depending on the vehicle manufacturer (OEM).

• B2317: Mirror Passenger Vertical Position Feedback Circuit Open (Ford, Lincoln, Mercury)
• B2317: Right Mirror Vertical Potentiometer Signal Open (Chrysler, Dodge, Jeep)
• B2317: Passenger Mirror Vertical Feedback Circuit Malfunction (General Motors, GM)

Code Overview for B2317 #

DTC B2317 is an OBD-II diagnostic trouble code indicating an open circuit in the vertical feedback potentiometer of the passenger side power mirror. The potentiometer is a type of variable resistor that sends position data to the vehicle’s control module, allowing precise adjustment and memory function for mirror angles. An “open circuit” means there is a break or disconnect in the electrical signal path, making the system unable to read the mirror’s vertical position. This code is typically set by the Body Control Module (BCM) or a dedicated Mirror Control Module when it loses feedback from the passenger mirror’s vertical adjustment sensor.

While this fault does not impact core safety systems, it affects the convenience and correct functioning of power mirrors, which can be critical for driver visibility and comfort. Understanding and addressing this code ensures continued reliability of mirror movement and memory features.

Common Symptoms for B2317 #

When B2317 is stored, you’ll usually notice issues related to the passenger side mirror’s adjustability or memory functions. These symptoms range from mild inconvenience to total loss of power adjustment in one direction. Look for these signs:

• Passenger mirror fails to move vertically (up/down) when commanded
• Mirror memory positions do not store or recall properly
• Mirror may move horizontally but not vertically
• Erratic or jerky mirror movement
• Warning message or icon on instrument cluster (in some vehicles)
• No audible feedback from mirror adjustment switch

Most Probable Causes for B2317 #

The root causes for B2317 are mostly electrical in nature, revolving around the feedback circuit or the potentiometer itself. The following causes are listed in order of likelihood:

1. Broken or disconnected wiring in the passenger mirror harness
2. Faulty vertical feedback potentiometer inside the mirror assembly
3. Corroded or loose connector at the mirror or under the door panel
4. Faulty Mirror Control Module (rare)
5. Internal open circuit in the mirror’s PCB (printed circuit board)

Step-by-Step Diagnostic Procedure for B2317 #

Accurate diagnosis for B2317 requires a logical, stepwise approach to isolate the fault. Here’s a proven method:

1. Retrieve all stored DTCs and freeze-frame data using a scan tool.
2. Clear the code, then operate the passenger mirror vertically and observe if the code returns.
3. Visually inspect the mirror’s electrical connector and harness for damage, pinched wires, or corrosion.
4. Check for 5V reference and ground at the potentiometer connector using a multimeter.
5. With the mirror connected, measure the feedback signal while moving the mirror; look for voltage change (typically 0.5–4.5V swing).
6. If no signal or voltage, disconnect the mirror and check continuity of the feedback wire between the mirror and control module.
7. Test the potentiometer’s resistance directly with an ohmmeter (if accessible) as you move the mirror.
8. If wiring and potentiometer test good, check for proper output from the Mirror Control Module—refer to OEM wiring diagrams.
9. Substitute a known-good mirror assembly if possible to confirm internal mirror fault.

Possible Repairs for B2317 #

Repairing B2317 involves addressing the specific component or wiring at fault. Typical solutions include:

• Repairing or replacing damaged wires in the mirror harness
• Cleaning or replacing corroded connectors at the mirror or door
• Replacing the passenger mirror assembly (if potentiometer is internal and not serviceable separately)
• Reseating or replacing the Mirror Control Module (rare cases)
• Repairing internal PCB traces (advanced, rarely attempted outside OEM repair)

Is It Safe to Drive with Code B2317? #

Yes, you can continue to drive with code B2317 present, as this fault does not affect the essential operation or safety systems of your vehicle. However, the inability to adjust the passenger mirror vertically can compromise your field of view, especially if multiple drivers use the vehicle or if the mirror is out of position. For optimal visibility and comfort, prompt repair is recommended.

Vehicles Most Commonly Affected by B2317 #

While feedback potentiometers are used in many power mirror systems, B2317 is most often reported on vehicles from the following brands:

• Ford (F-150, Explorer, Fusion, Edge, Flex, Lincoln MKX, etc.)
• Chrysler/Dodge/Jeep (Grand Cherokee, 300, Charger, Ram models)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac Escalade, Buick Enclave, etc.)
• Some Toyota and Lexus models with advanced memory mirror systems

Note: Not all vehicles use the same code numbering, so always consult OEM technical data for your specific model.

Common Mistakes & Best Practices for B2317 #

Misdiagnosis often leads to unnecessary replacement of the entire mirror or control module. Avoid these pitfalls by following these tips:

• Don’t skip a thorough wiring and connector check before replacing components.
• Don’t assume the switch is faulty unless verified—this code targets the feedback circuit, not the input switch.
• Use OEM wiring diagrams for accurate pin identification and circuit tracing.
• Always clear codes and re-test after repairs to confirm success.
• Document which wires were checked, voltages measured, and any visual findings for future reference.

Quick FAQ for Code B2317 #

Q: Can I just lubricate the mirror to fix B2317?
A: Lubrication may help with mechanical binding, but B2317 is an electrical fault in the feedback circuit, not a physical movement issue. Focus on wiring and electrical checks.

Q: Does replacing the mirror glass fix B2317?
A: No, the glass itself does not contain the potentiometer or wiring. The entire mirror assembly or its internal components must be repaired or replaced if faulty.

Q: Will this code clear itself if I disconnect the battery?
A: Disconnecting the battery may reset the code temporarily, but it will return if the root cause is not addressed.