B2315 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground #

Note: The code description and terminology may vary depending on the vehicle manufacturer (OEM). Below are some known variations of this DTC (Diagnostic Trouble Code) label:

• Ford: Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground
• Toyota: Mirror Right Horizontal Position Sensor Circuit Low
• GM: Passenger Mirror Horizontal Feedback Signal Low Voltage

Summary of code B2315 #

The B2315 diagnostic trouble code indicates a problem with the electrical circuit that monitors the horizontal movement of the passenger side mirror. Specifically, the feedback potentiometer—a sensor that detects the mirror’s position—has a circuit that is shorted to ground. In other words, an unintended electrical connection is sending the signal directly to the vehicle’s chassis ground, preventing accurate feedback about the mirror’s position. This fault can disrupt automated or memory mirror features, and may limit manual adjustment. Addressing this code promptly is important to maintain both convenience and safety features.

Common symptoms for code B2315 #

Drivers may notice several symptoms when the B2315 code is present. Some are subtle, while others can be immediately apparent, especially if the vehicle is equipped with memory or auto-folding mirrors. Typical symptoms include:

• Passenger mirror does not move horizontally when adjusted
• Mirror memory positions do not work or restore incorrectly
• Warning lights or error messages related to mirror functions
• Unusual clicking or lack of noise from the mirror motor
• Loss of auto-tilt or reverse-dip features (if equipped)

Most likely causes for code B2315 #

The B2315 code is generally triggered by electrical issues within the mirror’s feedback circuit. The following causes are presented by order of frequency:

1. Damaged or pinched wiring harness between the mirror and door module
2. Failed passenger mirror potentiometer (sensor assembly)
3. Corroded or loose connector at the mirror or door module
4. Short to ground within the door control module
5. Water intrusion causing short circuits in mirror or door wiring

Step-by-step diagnosis for code B2315 #

A systematic approach is key to accurately diagnosing B2315. Here is a recommended step-by-step process:

• Verify the code with a professional-grade scan tool and clear any history codes.
• Operate the passenger mirror and observe if horizontal movement responds or if other axes are affected.
• Visually inspect the mirror wiring from the door control module to the mirror housing for signs of damage, pinching, or corrosion.
• Check all connectors for secure fit and inspect for bent, broken, or corroded terminals.
• With the ignition off, use a multimeter to check for continuity between the potentiometer signal wire and ground. If continuity exists, a short is present.
• If wiring and connectors are intact, test the potentiometer resistance as you move the mirror manually. No change or zero reading indicates a failed sensor.
• If all components pass, check the door control module for internal faults or water damage.

Possible repairs for code B2315 #

Once the root cause is identified, the necessary repair can be performed. Common effective repairs include:

• Repairing or replacing damaged wiring harness sections
• Replacing the passenger mirror potentiometer or the entire mirror assembly if the sensor is integrated
• Cleaning or replacing corroded connectors and ensuring proper terminal tension
• Repairing or replacing the door control module if it is internally shorted
• Addressing sources of water intrusion, such as faulty mirror seals or door weatherstripping

Is it safe to drive with code B2315? #

Yes, but with limitations. Code B2315 does not affect core vehicle safety systems or drivability. However, mirror adjustment may be compromised, potentially creating blind spots or limiting rearward visibility—especially for different drivers or when using memory functions. Drivers should manually verify mirror position before driving and prioritize repairs if automated features are important for safe operation.

Vehicles most commonly affected by code B2315 #

While B2315 can appear on many modern vehicles with power mirrors, it is most frequently reported on models equipped with advanced memory or auto-fold mirror features, especially from the following OEMs:

• Ford (Explorer, F-150, Edge, Fusion)
• Lincoln (MKX, MKC, Navigator)
• Toyota/Lexus (Camry, Avalon, RX, ES)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac Escalade)
• Mazda (CX-5, Mazda6)

Common mistakes & best practices for code B2315 #

Diagnosing B2315 can seem straightforward, but a few pitfalls are common. Avoid these to ensure a successful repair:

• Assuming the mirror motor is faulty without checking the potentiometer circuit
• Overlooking damaged wires in the door jamb, where repeated opening/closing causes flexing
• Replacing the entire mirror assembly when only a connector or wire is at fault
• Not clearing codes after repair, leading to confusion if the code reappears
• Neglecting to check for water intrusion, especially after heavy rain or car washes

Quick FAQ for code B2315 #

Here are some quick answers to common questions about B2315:

• Q: Can the mirror still be manually adjusted?
  A: Often yes, but only vertically or manually by hand. Horizontal movement via switch is usually lost.
• Q: Will this code cause other electronics to malfunction?
  A: Unlikely, unless water or wiring damage affects other circuits in the door. Always check for broader electrical issues.