B2315 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground

What is the most common cause of B2315?

The most common causes are: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.

Is it safe to drive with B2315?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

What does OBD2 code B2315 mean?

B2315 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.

How do I diagnose B2315 myself?

Start with a scan: confirm B2315, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

What are the symptoms of B2315?

Drivers most often notice: no impact on engine operation in most cases, the affected function (locks, windows, lighting, wipers) works intermittently or not at all, warning light on the dashboard.

When your OBD2 scanner pulls code B2315, it means the vehicle's body control module has detected a specific electrical fault in the passenger-side mirror system. The full description reads "Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground." This falls into the body electrical category rather than powertrain or chassis codes, so engine performance typically remains unaffected.

The control module doesn't set B2315 after a single anomalous reading. It requires the fault condition to persist under specific operating parameters before triggering the check engine or warning light. When the code is stored, the scanner captures freeze frame data — engine load, RPM, coolant temperature, and vehicle speed at the moment of failure. That snapshot is invaluable during diagnosis because it lets you recreate the exact conditions under which the problem appeared.

The passenger mirror system uses a potentiometer to track the mirror's horizontal position. This feedback signal tells the BCM whether the mirror is moving correctly and whether it has reached the desired position. When this circuit shorts to ground, the voltage signal collapses, and the module recognizes the abnormality and logs B2315.

Typical Symptoms of B2315

• No change to engine operation or drivability in most cases
• The passenger mirror fails to adjust horizontally, or adjusts sluggishly
• The mirror may stop at random positions and not respond to switch commands
• Other body functions on the same circuit (if shared) may behave intermittently
• The malfunction indicator lamp may illuminate on the dashboard
• In some vehicles, the entire mirror adjustment module becomes non-responsive

Common Causes Behind B2315

• Corroded or moisture-damaged connector at the passenger mirror assembly
• Wiring harness damage in the door jamb where flexing wears through insulation
• A short-to-ground fault in the horizontal feedback potentiometer circuit
• Blown fuse protecting the mirror adjustment circuit
• Failed mirror switch or control module
• Body control module itself malfunctioning and misreading the circuit

Diagnostic Procedure for B2315

Follow these steps to isolate the root cause without replacing parts unnecessarily:

1. Connect an OBD2 scanner and confirm B2315 is stored. Record the freeze frame data — note the engine load, RPM, temperature, and speed recorded when the fault occurred.
2. Check for any related diagnostic trouble codes. Manufacturer TSBs (Technical Service Bulletins) for your specific make and model may identify known issues with this code family. Search the manufacturer website or nhtsa.gov using your VIN.
3. Perform a visual inspection of the passenger mirror wiring and connectors. Look for frayed wires, corroded pins, pushed-out terminals, or evidence of water intrusion — especially at the door hinge area where wiring passes through.
4. Use the scanner's live data feature to monitor the mirror position sensor while operating the horizontal adjustment switch. The voltage signal should change smoothly as the mirror moves.
5. Test the circuit for continuity and ground shorts using a multimeter. Disconnect the mirror connector and the BCM connector to isolate the affected section.
6. Clear the code, then drive the vehicle through the freeze frame conditions. If B2315 returns, you have confirmed the fault is still present and the repair is needed.

Repair Options and What to Expect

Addressing the underlying cause rather than guessing saves both time and money. The repair approach depends on which component is at fault:

• Wiring harness repair or connector replacement: $80–$250
• Passenger mirror switch replacement: $120–$450
• Body control module repair or replacement: $300–$900

Most B2315 faults trace back to damaged wiring or corroded connectors in the door jamb. These repairs are straightforward and relatively inexpensive compared to module replacement. Always inspect the harness thoroughly before committing to BCM replacement, which is the most costly scenario.

Total Repair Cost for B2315

Expect to pay between $80 and $900 depending on the actual failure point. Parts and labor at independent shop rates typically fall into these ranges: wiring repairs $80–$250, switch or actuator replacement $120–$450, and BCM replacement $300–$900. A precise diagnosis before purchasing parts is strongly recommended — the priciest repair is rarely the first one to investigate.

Driving Safety Assessment

B2315 is classified as a short-severity fault. The passenger mirror adjustment issue does not affect engine operation, braking, steering, or safety systems. Most drivers can continue using the vehicle without concern. However, the lost mirror adjustment can reduce visibility and create blind spots, which becomes a safety issue when maneuvering in traffic or parking. Central locking faults sharing the same circuit could theoretically leave the vehicle unsecured. Address the repair before a long trip or adverse weather conditions where full visibility is critical.

Related OBD2 Codes

• B2300: Seat Driver Memory Position Error
• B2301: Seat Passenger Memory Position Error
• B2302: Seat Headrest Feedback Potentiometer Circuit Failure
• B2303: Seat Headrest Feedback Potentiometer Circuit Open
• B2304: Seat Headrest Feedback Potentiometer Circuit Short to Battery
• B2305: Seat Headrest Feedback Potentiometer Circuit Short to Ground

The B2315 OBD2 fault code relates to the Mirror Passenger Horizontal Feedback Potentiometer circuit. When the circuit circuit failure, the module cannot properly monitor or control this body system.

At AIscanAuto, we help drivers quickly identify OBD2 trouble codes, understand their root causes, and find the right fix.

Symptoms

• Power mirror not moving in affected direction
• Memory mirror positions not recalling
• Possible heating function failure
• Intermittent operation

Common Causes

• Faulty component — internal damage or wear affecting Mirror Passenger Horizontal Feedback Potentiometer
• Wiring issues — broken, corroded, or chafed wires in the circuit
• Connector problems — loose, oxidized, or moisture-damaged pins
• a general circuit failure is detected — can result from wiring faults, connector issues, or component failure
• Module input failure — rare, but the control module input stage may be defective

Step-by-Step Diagnosis

1. Scan with OBD2 tool — Confirm B2315 is active. Check for additional DTCs.
2. Visual inspection — Examine the Mirror Passenger Horizontal Feedback Potentiometer wiring and connector for corrosion or damage.
3. Check voltage and ground — Use a multimeter to verify proper reference voltage.
4. Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
5. Check for shorts/opens — Perform continuity tests on the wiring between the component and control module.

Repair & Solutions

• If the component is defective, replace the Mirror Passenger Horizontal Feedback Potentiometer with an OEM or quality aftermarket part.
• Repair any damaged wiring or connectors using proper methods.
• Clear the DTC with an OBD2 scanner and test drive to verify the code does not return.
• If the code persists after component replacement, inspect the control module connector.

Related Codes

• B2312 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure
• B2313 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Open
• B2314 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short To Battery