B1668 — Mirror Driver Right/Left Motor Stalled

B1668 — Mirror Driver Right/Left Motor Stalled. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.

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 B1668 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 B1668 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1668 (parts and labor, USD, independent shop rates): BCM repair or replacement: $300–$900; Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250. Overall, fixing B1668 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

How much does it cost to fix B1668?

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.

What are the symptoms of B1668?

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

What does OBD2 code B1668 mean?

How do I diagnose B1668 myself?

Start with a scan: confirm B1668, 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 is the most common cause of B1668?

The most common causes are: corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.

B1668 — Climate Control Temperature Differential Circuit Short To Battery: Causes, Symptoms & Fix

The B1668 OBD2 fault code relates to the Climate Control Temperature Differential circuit. When the circuit short to battery, 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

Battery warning light
Electrical systems losing power
Possible no-start condition
Battery drain issues

Common Causes

Faulty component — internal damage or wear affecting Climate Control Temperature Differential
Wiring issues — broken, corroded, or chafed wires in the circuit
Connector problems — loose, oxidized, or moisture-damaged pins
a short to battery voltage is detected — connects the signal line directly to 12V, causing constant high voltage
Module input failure — rare, but the control module input stage may be defective

Step-by-Step Diagnosis

Scan with OBD2 tool — Confirm B1668 is active. Check for additional DTCs.
Visual inspection — Examine the Climate Control Temperature Differential 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 Climate Control Temperature Differential 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

B1665 — Wiper Front High Limit Input Circuit Short To Ground
B1666 — Climate Control Temperature Differential Circuit Failure
B1667 — Climate Control Temperature Differential Circuit Open

Your scan tool has pulled a B1668, and now you're wondering what that means for your car. This code belongs to the body electrical family of OBD2 diagnostics — it tells you the control module has detected that the mirror driver right/left motor has stalled or is drawing current outside normal parameters. The body control module (BCM) oversees a wide range of comfort and convenience features, including powered mirrors, and it constantly watches the electrical draw from each motor and actuator. When the mirror motor fails to spin up properly — or stops responding entirely — the BCM logs this fault after the condition persists long enough to exceed its internal thresholds. In most cases, that triggers the check-engine-style warning light, though on some vehicles it may only illuminate a dedicated body fault indicator.

The freeze frame data stored alongside B1668 is your first real clue. When the module sets this code, it snapshots the engine's operating conditions at that exact moment — RPM, engine load, coolant temperature, vehicle speed, and similar parameters. That snapshot tells you whether the mirror failed while idling, cruising down the highway, or during a cold start, and that context often points toward the root cause. A motor that stalls only when the engine is cold suggests different issues than one that fails at highway speed under electrical load.

Understanding the system helps narrow things down. The mirror motor is a small DC motor with two wires — one feeds power, the other ground. The BCM controls direction by flipping polarity. When you press the mirror switch, the BCM routes voltage to the appropriate terminals. If the motor draws too much current ( seized), too little (open circuit), or nothing at all (failed windings), the module recognizes the stall and sets B1668. Wiring runs through the door hinge area, a notorious spot for broken wires due to the constant flexing every time you open the door.

Common Symptoms of B1668

The check-engine or body fault light stays illuminated on the instrument cluster
The affected mirror does not move in any direction when you use the switch
Mirror movement is sluggish, intermittent, or stops partway through its travel
No impact on engine performance, transmission operation, or fuel economy
In some cases, adjacent functions on the same circuit (other mirrors, windows) may also act up
The mirror may hold its last position but fail to respond to new commands

What Causes B1668

Corroded or loose electrical connectors at the mirror housing or BCM
Broken or chafed wiring inside the driver door boot where wires flex with every open and close
Body control module itself malfunctioning or losing its programming
The mirror motor winding has failed or the gear mechanism is seized
Faulty mirror selection switch on the door panel
Water intrusion into the mirror housing, causing short circuits or corrosion

How to Diagnose B1668

Start by confirming the code exists and gathering data before touching anything:

Connect your OBD2 scanner, read B1668, and record the freeze frame data — note the RPM, load, temperature, and speed values when the fault triggered.
Check for any related trouble codes in the body system. B1668 often shares a circuit with other mirror or window motors, so a related code may point directly to the bad connection or component.
Look up manufacturer TSBs for your specific make, model, and model year — the B0xxx family has known software bugs and harness updates on certain vehicles that could resolve the issue without any physical repair.
Perform a visual inspection of the mirror wiring harness, focusing on the door jamb pass-through where wires bend repeatedly. Check for broken strands, worn insulation, and corrosion on the pins.
Test the mirror motor directly at its connector using a multimeter or a 12-volt power probe — if it draws current and spins, the problem is upstream in the switch or BCM output.
Clear B1668, then run a complete drive cycle that replicates the freeze frame conditions (same speed, temperature range, electrical load). If the code returns, you have confirmed an active fault and can move forward with repairs.

Repair Options and Costs

The fix always depends on finding the actual failure point, not just throwing parts at the code:

Wiring repair or connector replacement: $80–$250. In many cases, the wire inside the door boot has broken from flex fatigue, or a connector is loose and corroded. Repairing the harness or cleaning/replacing the connector resolves B1668 without any component replacement.
Mirror switch or actuator motor replacement: $120–$450. If the motor itself is the culprit, you'll need either a new mirror motor assembly or a complete mirror housing. The switch on the door panel is less common but also falls into this price band when it fails.
BCM repair or replacement: $300–$900. The body control module is the most expensive fix here, and it's usually not the first thing to check. BCM failure is uncommon compared to wiring issues, but it happens, especially if there are signs of water damage or the module has lost programming.

How Much Does Fixing B1668 Cost?

Your total bill depends entirely on which part is actually at fault. The most affordable fix — a broken wire in the door boot or a loose connector — typically runs $80 to $250 for parts and labor. Actuator or switch replacement sits in the $120 to $450 range depending on your vehicle and whether you use OEM or aftermarket parts. BCM replacement is the nuclear option at $300 to $900, including programming and calibration on most models. Across all scenarios, expect to pay somewhere between $80 and $900, with $250 to $400 being the most common outcome when the issue is a failed motor or wiring. Always get an accurate diagnosis before buying expensive modules — the cheapest cause is almost never the first one most DIYers think of, but it should be the first one checked.

Can You Drive with B1668?

B1668 is primarily a comfort and convenience code. The engine, transmission, brakes, and safety systems operate normally with this fault stored. You can drive the vehicle without risking drivability damage. The practical consideration is that you lose one mirror's adjustability, which can create a blind spot if the other mirror is already limited in its range. In poor weather, non-functional mirrors are more than an inconvenience — they are a safety gap. If your vehicle has central locking faults stored alongside B1668, that warrants faster attention, as an unsecured car is a different kind of risk. For the mirror issue alone, schedule the repair at your convenience, but do not ignore it indefinitely.