C1248 — ABS Outlet Valve Coil RR Circuit Short To Battery

OBD2 code C1248 flags a problem with the ignition system (ABS outlet valve coil RR circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.

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 C1248 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 C1248 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1248 (parts and labor, USD, independent shop rates): Replace spark plugs: $90–$250; Replace an ignition coil: $150–$380; Repair coil wiring or connector: $80–$250. Overall, fixing C1248 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

Is it safe to drive with C1248?

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 much does it cost to fix C1248?

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

What does OBD2 code C1248 mean?

Will C1248 clear itself?

Sometimes C1248 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 are the symptoms of C1248?

Drivers most often notice: hard starting, especially in damp weather, misfires under load or at idle, increased fuel consumption, loss of power and jerking.

When your vehicle's anti-lock brake system detects a problem with the rear-right hydraulic valve coil circuit, it logs trouble code C1248. Specifically, this code indicates that the ABS module has identified a short-to-battery condition in the outlet valve coil circuit for the rear-right wheel. The fault lives within the ABS hydraulic control unit, which manages brake pressure during emergency stops or low-traction situations. Because the module performs continuous self-checks on each valve solenoid, any abnormal voltage reading—particularly unwanted power from the battery circuit—triggers this diagnostic trouble code.

The ABS module uses a network of inlet and outlet solenoid valves to regulate hydraulic pressure at each wheel. During normal operation, the module energizes these coils in rapid succession to prevent wheel lockup. When C1248 sets, the module has confirmed that the rear-right outlet valve coil is receiving voltage when it should be grounded, or that a wiring fault is feeding battery power into the control circuit. Most manufacturers require this fault to appear multiple times under driving conditions before illuminating the ABS warning light, which helps prevent false triggers from temporary electrical glitches.

Symptoms of C1248 tend to manifest in stages. The ABS warning light almost always activates, serving as the primary indicator that something is wrong with the anti-lock system. In many cases, the traction control indicator may also illuminate, since these systems share hardware and software within the brake control module. Drivers might notice reduced ABS responsiveness during hard braking, or the system may deactivate entirely until the fault is cleared. On some vehicles, the brake warning light can also turn on if the module detects a condition that affects overall braking performance. Occasional intermittent operation—where the light flickers or goes out temporarily—often precedes a permanent code storage. You may also experience unusual brake pedal feel, such as pulsing that does not match normal ABS activation patterns.

Most Common Causes

The root cause typically falls into one of three categories, listed here from most to least frequently encountered. Wiring damage ranks first: the harness running to the rear ABS valve circuit commonly suffers from chafing, connector corrosion, or pin damage due to its location near the rear suspension and wheel well. The valve coil inside the hydraulic unit itself can fail internally, producing the same short-to-battery signature. A failed ABS module represents a less common but more expensive scenario, where the internal circuitry that controls the rear valve driver stage malfunctions. In rare instances, a power supply issue—such as a short elsewhere in the vehicle feeding into the ABS circuit—can trigger C1248 even when the valve coil and wiring are sound.

Diagnosing C1248 Step by Step

Before replacing expensive components, follow a logical diagnostic sequence to isolate the exact failure point. Begin by connecting an OBD2 scanner to confirm C1248 is stored, then record all available freeze frame data and check for any additional related codes in the ABS module. Next, perform a thorough visual inspection of the ABS wiring harness near the rear differential or rear suspension, looking for damaged insulation, corroded connectors, or loose contacts that could cause a short. Test the resistance of the rear outlet valve coil using a multimeter—compare your reading against the specification in your vehicle's service manual to determine if the coil itself is faulty. With the key on and engine off, back-probe the valve control circuit at the ABS module connector to check for unexpected voltage that should not be present. Finally, clear the code and complete a test drive that includes hard braking maneuvers to verify whether C1248 returns.

Repair Options and Costs

Repair costs vary significantly depending on which component is responsible for C1248. If the fault lies in the wiring harness or connector, repairs typically range from $80 to $250 depending on the extent of the damage and whether a partial repair or full harness replacement is needed. Replacing the ABS hydraulic pump assembly—which houses the valve coils—is considerably more expensive, generally running between $350 and $900 for parts alone, with additional labor charges that can push the total to $600–$1,400 depending on vehicle make and model. In cases where the ABS module itself requires replacement or reprogramming, costs typically fall between $200 and $600 for the module plus $100–$300 in programming fees.

Total Repair Estimate

For most vehicles, addressing C1248 costs between $80 and $1,400, with the actual total depending entirely on whether the issue is wiring-related or requires hydraulic unit replacement. Independent shop labor rates typically add $80–$150 per hour, so a straightforward wiring repair might total $150–$400, while a complete ABS pump replacement could reach $800–$1,500. Always verify the exact cause through proper diagnosis before committing to the higher-cost repair scenario, because wiring faults are far more common than module or pump failures.

Driving Safety Verdict

Severity level: caution. C1248 does not typically prevent you from driving, but the compromised ABS function means your vehicle will lack anti-lock braking assistance during emergency stops or slippery conditions. If the brake warning light also activates or you notice altered brake pedal feel, reduce speed and schedule repairs immediately. Avoid aggressive braking maneuvers until the fault is resolved, as unassisted hard stops can cause wheel lockup on surfaces where ABS would normally prevent it.