B1957 — Seat Front Up/Down Potentiometer Feedback Circuit Short To Ground

body electrical

Is it safe to drive?

Short-term driving is OK 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 to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1957 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1957 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1957 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; BCM repair or replacement: $300–$900; Replace the switch or actuator: $120–$450. Overall, fixing B1957 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code B1957 mean?

Seat Front Up/Down Potentiometer Feedback Circuit Short To Ground (B1957): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, corroded or loose connectors.

Will B1957 clear itself?

Sometimes B1957 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.

How much does it cost to fix B1957?

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

What is the most common cause of B1957?

The most common causes are: 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 B1957?

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.

When the powertrain or body control module logs trouble code B1957, it's telling you there's an electrical problem with the seat front up/down potentiometer feedback circuit — specifically, a short to ground. The potentiometer in this circuit acts as a position sensor, feeding voltage back to the control module so it knows exactly where the seat adjuster motor sits at any moment. When that feedback signal drops to zero or shorts to ground unexpectedly, the module detects the anomaly and flags B1957.

This is a body electrical fault, not an engine or drivetrain issue. The module doesn't set B1957 on a single glitch — it watches for the fault to appear repeatedly under specific conditions before activating the warning light. That's why the freeze frame data stored alongside the code is so useful. Those readings (engine load, RPM, coolant temperature, vehicle speed) tell you exactly what was happening when the problem occurred, making it much easier to reproduce the failure during testing.

Common Symptoms of B1957

The seat height adjustment (front up/down function) operates intermittently or stops responding entirely
The driver's seat may not hold its last position or moves sluggishly when commanded
A dashboard warning light or indicator related to seat adjustment illuminates
The fault may disappear and reappear as the seat is moved through its full range of travel
In most vehicles, engine performance and drivability remain completely unaffected
Other body functions (windows, locks, lighting) may also behave erratically if the underlying issue involves shared wiring or the body control module

Common Causes

Corroded, moisture-damaged, or loose electrical connectors at the seat harness or control module
Damaged or chafed wiring insulation, especially where wires pass through the seat track or floor pan
A faulty seat adjustment switch or worn contacts within the switch assembly
A failed potentiometer within the seat motor or actuator housing
A blown fuse or malfunctioning relay supplying power to the seat adjustment circuit
A defective body control module (BCM) unable to process the feedback signal correctly
Broken wires at flex points such as door jambs or seat mounting areas subjected to repeated bending

How to Diagnose B1957

Connect an OBD2 scan tool and confirm B1957 is stored in the body control module. Save all available freeze frame data — this snapshot of engine conditions when the fault occurred is your roadmap for recreating the problem.
Check for any related diagnostic trouble codes stored alongside B1957. Often, secondary codes point directly to the failing component, whether it's a shorted motor, bad switch, or wiring issue.
Visually inspect the seat wiring harness, connectors, and ground points for visible damage, corrosion, pinched wires, or loose terminals. Pay special attention to areas where the harness routes through metal brackets or around moving seat tracks.
Use your scan tool to monitor the potentiometer feedback voltage in live data while someone operates the seat switch. A healthy circuit shows smooth voltage transitions as the motor moves — a stuck, jumping, or flatlined reading confirms the fault.
Inspect connectors at flex points where wires bend repeatedly, such as the seat hinge area or door sill pass-through. Wires break here first due to fatigue, and an intermittent short to ground often goes hand-in-hand with insulation damage at these stress points.
Clear B1957 after repairs, then complete a full drive cycle including the specific conditions from your freeze frame data. Run the seat through multiple adjustment cycles to confirm the code does not return.

Repair Options and Costs

Address the cheapest and most common failures before committing to expensive component replacements:

Wiring harness repair or connector terminal replacement: $80–$250
Body control module (BCM) repair or replacement: $300–$900
Seat adjustment switch or potentiometer/actuator replacement: $120–$450

Most B1957 faults trace back to damaged wiring or failing connectors rather than a dead BCM. Professional diagnosis before purchasing parts is money well spent — the most expensive repair scenario is rarely where you need to start.

Driving Safety Verdict

B1957 carries a short-term driving safety rating. The seat adjustment fault itself does not impair engine operation, braking, or steering, so you can continue driving without immediate concern for drivability. However, if the seat becomes stuck in an unsafe position — blocking your view or preventing proper pedal access — stop driving and address the issue promptly. Additionally, if the underlying short affects other body systems like exterior lighting or central locking, those functional impacts warrant faster repair to maintain vehicle safety and security.

Related OBD2 codes

B1957 — Seat Front Up/Down Potentiometer Feedback Circuit Short To Ground: Causes, Symptoms & Fix

The B1957 OBD2 fault code relates to the Seat Front Up/Down Potentiometer Feedback 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

Seat not adjusting in affected direction
Memory positions not recalling
Possible motor noise or no response
Heated seat may not work

Common Causes

Faulty component — internal damage or wear affecting Seat Front Up/Down Potentiometer Feedback
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

Scan with OBD2 tool — Confirm B1957 is active. Check for additional DTCs.
Visual inspection — Examine the Seat Front Up/Down Potentiometer Feedback wiring and connector for corrosion or damage.
Check voltage and ground — Use a multimeter to verify proper reference voltage.
Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
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 Seat Front Up/Down Potentiometer Feedback 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

B1954 — Seat Front Up/Down Potentiometer Feedback Circuit Failure
B1955 — Seat Front Up/Down Potentiometer Feedback Circuit Open
B1956 — Seat Front Up/Down Potentiometer Feedback Circuit Short To Battery