C1249 — ABS Outlet Valve Coil RR Circuit Short To Ground

OBD2 code C1249 flags a problem with the ignition system (ABS outlet valve coil RR circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: damaged coil wiring or connector, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

chassis (brakes/steering/suspension)

Is it safe to drive?

Drive with caution Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm C1249 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 C0xxx 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 ignition system for damage, corrosion, chafing or poor contact.
Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1249 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1249 (parts and labor, USD, independent shop rates): Repair coil wiring or connector: $80–$250; Replace an ignition coil: $150–$380; Replace spark plugs: $90–$250. Overall, fixing C1249 usually costs between $80 and $380. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of C1249?

The most common causes are: damaged coil wiring or connector, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

How do I diagnose C1249 myself?

Start with a scan: confirm C1249, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition system, and verify the suspect component against live data before buying parts.

Will C1249 clear itself?

Sometimes C1249 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 C1249 mean?

How much does it cost to fix C1249?

Repair coil wiring or connector — $80–$250; Replace an ignition coil — $150–$380; Replace spark plugs — $90–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When your scanner pulls code C1249, it's telling you something specific about your anti-lock braking system. The control module has detected a short to ground in the rear-right ABS outlet valve coil circuit. In plain terms, the electrical path that commands the ABS valve to release brake pressure in the rear-right wheel is failing to complete its circuit properly. The module logs C1249 only after confirming the fault across multiple drive cycles under specific conditions—this isn't a one-time sensor glitch, it's a persistent electrical problem within your brake system's ABS circuit.

The ABS unit relies on electrically operated valves to modulate brake pressure during hard braking or low-traction situations. Each corner of the vehicle has inlet and outlet valves; the outlet valve specifically controls pressure release when the system needs to reduce braking force at a wheel. When C1249 sets, the rear-right outlet valve either cannot receive its command signal or cannot complete the ground portion of its circuit. The module responds by disabling ABS functionality for the entire system in most cases, since operating with a known-faulty valve is unsafe. You'll typically see the ABS warning light illuminate on the dash as confirmation that the module has entered this protective mode.

Symptoms of C1249

When C1249 is active, your braking experience changes noticeably. The most obvious symptom is the ABS warning light staying solid on the instrument cluster. Beyond that light, you may notice the brake pedal feeling different during panic stops—the anti-lock pulsing you normally feel under heavy braking simply won't happen. Some vehicles with integrated ABS and stability control may also disable traction control or stability assist when this code is stored. In severe cases, the module may apply slight brake drag to the rear-right wheel as a failsafe measure, which can cause the vehicle to pull slightly to the right during normal driving. The parking brake warning light might also activate if the system shares circuits or interprets the fault broadly.

What causes C1249?

The root causes of C1249 typically trace back to the electrical side of your ABS unit. The most frequent culprit is a damaged wiring harness or connector feeding the rear ABS valve—the wires can chafe against suspension components, frame rails, or brake lines over time, eventually exposing the copper and causing a short to ground. Corrosion at the connector pins is equally common, especially in regions where road salt is used during winter months. High brake fluid temperatures over many years can degrade the solenoid coils inside the ABS valve body itself, causing internal shorts. A failed ABS hydraulic control unit where the valve assembly is integrated can also set this code, though that's a pricier repair. In some instances, a shorted pump motor or damaged relay within the ABS module can create ground faults that manifest as valve circuit codes. Power surges from jump-starting or electrical work on other systems have been known to damage the ABS module's internal circuitry as well.

How to diagnose C1249

Begin by connecting a quality OBD2 scanner and confirming C1249 is stored. Record the freeze frame data—this shows engine speed, vehicle speed, brake application status, and other parameters at the moment the module detected the fault. Next, pull all other stored codes; a cluster of ABS-related codes often points to a shared ground or power issue rather than a single failed component. Inspect the wiring harness leading to the rear ABS valve, which typically routes near the rear differential or along the frame rail depending on your vehicle layout. Look for cracked insulation, corroded pins at the connector, and any signs of the wire being pulled or stretched. Check for water intrusion in the connector—moisture creates alternate ground paths that the module interprets as a valve fault. Measure the resistance of the outlet valve coil at the connector using a multimeter; specifications vary by manufacturer, but values typically range from 2 to 12 ohms. An open circuit or infinity reading indicates a failed coil inside the valve assembly. If wiring and connector check out, the ABS hydraulic unit itself requires replacement.

Repair options and costs

Wiring repair addresses the most common cause of C1249. If the harness is damaged but salvageable, splicing and sealing the affected section runs $80 to $150 for parts and labor. Replacing a corroded connector runs $100 to $250 depending on whether the connector is a separate part or integrated into a larger harness section. Replacing the entire rear ABS valve requires replacing the hydraulic control unit in most vehicles since valves are not serviceable separately. An aftermarket or remanufactured ABS unit costs $250 to $450 for the part alone, with installation labor adding $200 to $400 more, bringing total cost to $450 to $850. Used salvage yards units can reduce parts cost to $100 to $200 but carry no warranty and may fail soon after installation.

How much does fixing C1249 cost?

For most vehicles, expect to spend between $80 and $850 depending on which component is at fault. The cheapest fix is a simple wiring repair at $80 to $250 if the harness is accessible and damage is minor. Valve coil or connector replacement typically runs $150 to $380. Full ABS hydraulic unit replacement—necessary when the solenoid itself has failed—is the most expensive scenario, ranging from $450 to $850 with parts and professional installation. Always verify the exact cause before committing to a hydraulic unit replacement, as wiring issues are far more common.

Can you drive with C1249?

Drive with caution when C1249 is stored. Your vehicle retains normal conventional braking—the pedal works, the car stops. What you lose is anti-lock and often stability control functionality. On dry pavement this limitation may not be noticeable, but on wet roads, gravel, ice, or during emergency maneuvers, the absence of ABS means your wheels can lock and skid. If the brake warning light is also illuminated, have the vehicle serviced before extended driving. The fault will not damage other components, but driving in conditions that require ABS without it increases stopping distance and reduces directional control significantly.