B2319 — Mirror Passenger Vertical Feedback Potentiometer Circuit Short to Ground

What is the most common cause of B2319?

The most common causes are: body control module (BCM) fault, blown fuse or failed relay, damaged wiring in door jambs or wet areas.

How do I diagnose B2319 myself?

Start with a scan: confirm B2319, 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 does OBD2 code B2319 mean?

OBD2 code B2319 flags a problem with the body electrical system (mirror passenger vertical feedback potentiometer circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, blown fuse or failed relay, damaged wiring in door jambs or wet areas.

How much does it cost to fix B2319?

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

What are the symptoms of B2319?

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

When your scan tool pulls a B2319, the vehicle's body control module has detected that a specific circuit is behaving outside its designed parameters. Specifically, B2319 points to the passenger-side mirror's vertical feedback potentiometer circuit experiencing a short to ground. This falls under the broad category of body electrical faults in the B-series trouble code family. The code won't appear because the mirror stopped moving — it appears because the electronic feedback signal that tells the control module the mirror's exact vertical position has dropped to zero or near-zero, which the module interprets as a ground short.

The potentiometer in question works like a variable resistor inside the mirror assembly. As the mirror tilts up or down, the potentiometer's resistance changes proportionally, sending a voltage signal back to the body control module. The module uses this feedback to confirm the mirror has reached its commanded position and to enable auto-tilt functions when reversing. When this circuit develops a direct short to ground, the voltage collapses and the feedback signal disappears, triggering B2319 after the condition persists long enough to meet the module's fault detection threshold.

The ECU stores B2319 based on continuous monitoring during normal vehicle operation. Most manufacturers require the fault to be present for two consecutive drive cycles before illuminating the check engine light or body warning indicator. When the code sets, the module also captures freeze frame data — a snapshot of engine RPM, load, temperature, and vehicle speed at the exact moment the fault was detected. This information is invaluable during diagnosis because it shows what conditions the vehicle was operating under when the problem occurred.

Symptoms of B2319

• The passenger mirror fails to tilt vertically or moves only in one direction
• Mirror position feedback is absent or incorrect in live data streams
• The mirror may stop responding to driver memory recall commands
• Dashboard body system warning light illuminates (varies by manufacturer)
• No effect on engine performance or fuel delivery under most conditions
• Related mirror or seat memory functions operate intermittently

Common Causes of B2319

• Corroded or moisture-damaged connectors at the mirror harness or door junction
• Broken or chafed wires in the door boot where flexing occurs
• Failed mirror tilt motor with integrated potentiometer
• Blown fuse supplying the mirror circuit
• Body control module internal fault or software glitch
• Aftermarket alarm or accessory installation interfering with the circuit

Diagnosing B2319

Before diving into complex testing, confirm the code exists and understand what triggered it:

1. Connect a quality OBD2 scanner, record all stored codes including B2319, and save the freeze frame data. Note the specific conditions — load percentage, coolant temperature, and vehicle speed — recorded when the fault first appeared.
2. Run a visual inspection of the passenger mirror assembly and its electrical connections. Remove the mirror from its mount if necessary to access the three-wire connector supplying the tilt motor and potentiometer.
3. Check the door wire harness at the hinge point where it flexes every time the door opens. This area suffers from broken strands even when the insulation looks intact — use a multimeter for continuity testing on each individual wire.
4. Inspect the connector at the body side of the door harness. Push and pull the connector while monitoring resistance — an intermittent connection here will often show up as fluctuating readings.
5. Test the potentiometer signal at the mirror connector with the key on. The signal wire should show varying voltage as you manually tilt the mirror (have a helper push the switch or bypass the circuit temporarily).
6. Clear B2319 after your inspection, then complete a full drive cycle replicating the freeze frame conditions. If B2319 returns, you've isolated a hard failure rather than a loose connection or water intrusion issue.

Repair Options and Costs

The repair approach depends entirely on what your diagnosis uncovers. Mirror tilt motors with integrated potentiometers typically come as a complete assembly — individual potentiometer replacement is rarely practical.

• Replace mirror tilt motor assembly: $120–$450
• Repair damaged wiring harness or connectors: $80–$250
• Body control module replacement or software update: $300–$900

If the wiring is intact and the mirror motor tests bad, the motor replacement is usually the most straightforward fix. Wiring repairs require splicing and weatherproofing but avoid the cost of new components. BCM issues are uncommon but do occur — always verify all other possibilities before replacing the module.

Total repair cost for B2319 typically falls between $80 and $900 depending on which component failed. Spending time on accurate diagnosis prevents buying expensive parts for a wiring problem.

Can You Drive with B2319?

B2319 carries a short severity rating. The passenger mirror tilt function is convenience-oriented rather than safety-critical. You can drive the vehicle normally while the code is active. The main inconvenience is reduced visibility adjustment if the mirror position cannot be controlled. Central locking and exterior lighting functions should remain unaffected unless B2319 is part of a broader body system issue.

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 B2319 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 B2319 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

• B2316 — Mirror Passenger Vertical Feedback Potentiometer Circuit Failure
• B2317 — Mirror Passenger Vertical Feedback Potentiometer Circuit Open
• B2318 — Mirror Passenger Vertical Feedback Potentiometer Circuit Short To Battery