B2316 — Mirror Passenger Vertical Feedback Potentiometer Circuit Failure

What are the symptoms of B2316?

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

Will B2316 clear itself?

Sometimes B2316 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code B2316 mean?

B2316 — Mirror Passenger Vertical Feedback Potentiometer Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, corroded or loose connectors.

Is it safe to drive with B2316?

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.

How much does it cost to fix B2316?

BCM repair or replacement — $300–$900; Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

The passenger mirror vertical feedback potentiometer is a small variable resistor that tells the body control module where the mirror is positioned. When this potentiometer fails or sends abnormal readings to the BCM, code B2316 is stored. The BCM monitors this feedback signal as part of its self-diagnostic routines, comparing actual readings against expected values across multiple drive cycles to confirm a genuine fault rather than a temporary glitch.

The potentiometer works as part of a closed-loop positioning system—similar to the one your HVAC door actuator uses for blend door positions. When you adjust your passenger mirror up or down, the potentiometer's wiper moves across a resistive track, changing the voltage signal the BCM receives. That voltage tells the module exactly what position the mirror is in, which is crucial for features like memory seat recall (if your vehicle has linked mirror memory). When the BCM detects this signal going out of range—either too high, too low, or completely absent—it sets B2316.

This code falls within the B0xxx range, which covers body electrical faults. It's specific to the passenger side mirror's vertical (up/down) adjustment feedback circuit. The ECU logs this code when the signal falls outside factory-specified parameters for a sustained period.

Symptoms of B2316

• The mirror won't move in the vertical direction or moves erratically
• The mirror may work in one direction but not the other
• Memory seat recall may not properly position the passenger mirror
• A warning light appears on the dashboard
• Other comfort features (windows, locks, interior lighting) may also be affected if there's a broader electrical issue
• Engine operation remains normal—this fault does not impact performance or fuel economy

Common Causes of B2316

The most frequent culprit is wiring damage in the door jamb boot—the wires for the mirror run through a flexible conduit that flexes thousands of times over the vehicle's life, eventually breaking the small conductors inside. Beyond that, the issue could stem from a failing mirror motor assembly with an internal potentiometer, a corroded or loose electrical connector at the mirror or BCM, or the BCM itself experiencing internal failure. Blown fuses and failed relays in the mirror circuit also occur, though less commonly.

How to Diagnose B2316

1. Connect an OBD2 scanner, confirm B2316 is stored, and save the freeze frame data—this snapshot of engine RPM, load, coolant temperature, and vehicle speed tells you exactly what conditions triggered the fault.
2. Scan for related diagnostic trouble codes. B2316 often appears alongside other body system codes that point to the real root cause, whether it's a wiring issue or a module problem.
3. Perform a thorough visual inspection of the wiring harness at the driver's door hinge and along the door runner. This flex point experiences constant movement and frequently damages wires.
4. Test the mirror potentiometer signal with a multimeter at the connector—compare your readings to factory specifications to verify proper voltage variation through the full range.
5. Clear the code, complete a drive cycle that exercises the mirror through its full range, and confirm B2316 does not return.

Repair Options and Costs

The most economical approach is addressing wiring damage first since this is the most frequent cause. Replacing the mirror motor assembly typically costs $120–$450 depending on the vehicle. BCM replacement is more involved, running $300–$900, though this is less often necessary. Connector repair or replacement generally falls between $80–$250.

Total repair costs typically range from $80 to $900 depending on which component requires attention. An accurate diagnosis before purchasing parts prevents unnecessary expenses—the most expensive repair isn't always the actual problem.

Can You Drive with B2316?

The vehicle remains driveable since this fault does not impair engine performance or safe operation. However, functional limitations exist: the mirror won't adjust vertically, memory recall may not properly position the passenger mirror, and exterior lighting or wipers could be affected if the issue stems from a broader electrical problem. While not a safety hazard, getting the code diagnosed and repaired restores full mirror functionality.

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](https://aiscanauto.com/d

The B2316 OBD2 fault code relates to the Mirror Passenger Vertical 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 Vertical 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 B2316 is active. Check for additional DTCs.
2. Visual inspection — Examine the Mirror Passenger Vertical 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 Vertical 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

• B2313 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Open
• B2314 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short To Battery
• B2315 — Mirror Passenger Horizontal Feedback Potentiometer Circuit Short To Ground