P0813 — Reverse Output Circuit

How much does it cost to fix P0813?

Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000. 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 P0813?

Drivers most often notice: the affected system operates intermittently or not at all, Check Engine Light on, increased fuel consumption in some cases, possible limp mode depending on the affected component.

Is it safe to drive with P0813?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P0813 clear itself?

Sometimes P0813 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 P0813 mean?

P0813 — Reverse Output Circuit. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.

When your vehicle's computer detects a problem with the reverse output circuit, it logs trouble code P0813. This code falls under the powertrain category, meaning it involves systems shared between the engine and transmission. Put simply, P0813 tells you that a sensor or actuator in the reverse circuit is sending readings outside the expected range — the module sees a signal that does not match what it should be seeing.

The engine control unit (ECU) or transmission control module (TCM) constantly compares live sensor data against factory-calibrated parameters. When those readings drift outside acceptable limits across multiple drive cycles, the module flags P0813. At the same time, the computer saves a freeze frame — a snapshot of engine speed, load, coolant temperature, and vehicle speed the instant the fault occurred. That snapshot is one of the most useful starting points for diagnosis, because it tells you exactly what conditions triggered the code.

Common symptoms of P0813

• The Check Engine Light illuminates on the dashboard
• The reverse circuit operates inconsistently or stops working entirely
• Fuel consumption rises noticeably in some vehicles
• The transmission may enter limp-home mode, limiting gear selection
• Other auxiliary systems linked to the affected circuit can fail or behave erratically

What causes P0813?

• A failed driver inside the control module itself
• Corrosion, looseness, or physical damage at an electrical connector
• An internally failed sensor or actuator in the reverse circuit
• A blown fuse that supplies power to the circuit
• Wiring that is open (broken) or shorted to ground or voltage
• Chafed insulation allowing wires to contact the chassis

How to diagnose P0813

1. Plug in a quality OBD2 scanner and confirm P0813 is stored in the ECU. Record the freeze frame data before clearing anything — this record shows the engine conditions present when the fault was first detected.
2. Look for any related diagnostic trouble codes alongside P0813. Additional codes often point to the real root cause, whether that is a sensor failure, wiring problem, or module issue.
3. Check whether the manufacturer has issued a technical service bulletin (TSB) for your specific make, model, and model year. Factory service bulletins can reveal known defects, software updates, or repair procedures that apply to your exact vehicle.
4. Perform a thorough visual inspection of all wiring and connectors tied to the reverse output circuit. Look for broken insulation, corrosion, bent pins, and any signs of moisture intrusion.
5. Use a multimeter to check reference voltage, ground integrity, and signal continuity at the component harness. A poor ground or missing voltage reference immediately narrows the problem area.
6. With the scanner in live data mode, gently wiggle the harness while monitoring the signal. Any dropouts or erratic readings point to an intermittent wire break.

Repair options for P0813 with typical costs

The repair strategy should follow a logical order — address the cheapest and most common problems before replacing expensive components.

• Replace the faulty sensor or actuator: $150–$500
• Repair damaged wiring or connectors: $80–$250
• Control module repair or replacement: $300–$1,000

How much does it cost to fix P0813?

In most scenarios, an independent shop will charge between $80 and $1,000 total to resolve P0813. The wide range reflects how many different components can trigger the code. The most expensive fix — a faulty control module — is rarely the culprit, so an accurate diagnosis before purchasing parts almost always saves money.

Can you drive with P0813?

In most vehicles, the car remains drivable after P0813 sets, though you may notice reduced performance, disabled reverse functionality, or an illuminated limp-mode indicator. If the code causes stalling, failure to start, or triggers warnings related to braking or steering assist, treat it as a priority and have the vehicle inspected immediately.

Related OBD2 codes

• P0800: Transfer Case Control System (MIL Request)
• P0801: Reverse Inhibit Control Circuit Malfunction
• P0802: Transmission Control System MIL Request Circuit/Open
• P0803: 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction
• P0804: 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction
• P0805: Clutch Position Sensor Circuit