C1245 — ABS Outlet Valve Coil LR Circuit Short To Ground

What does OBD2 code C1245 mean?

OBD2 code C1245 flags a problem with the ignition system (ABS outlet valve coil LR circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.

Will C1245 clear itself?

Sometimes C1245 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 do I diagnose C1245 myself?

Start with a scan: confirm C1245, 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.

How much does it cost to fix C1245?

Replace an ignition coil — $150–$380; Repair coil wiring or connector — $80–$250; 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.

What are the symptoms of C1245?

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

When the anti-lock braking system control unit detects abnormally low resistance or an unintended ground path in the rear-left outlet valve circuit, it stores OBD2 code C1245. The code label translates to "ABS Outlet Valve Coil LR Circuit Short To Ground," with LR specifically indicating the left-rear wheel position. This fault falls within the chassis systems category, meaning it relates directly to the braking hardware rather than the engine or transmission.

The ABS hydraulic unit contains multiple solenoid valves—one inlet and one outlet valve per wheel circuit. During normal operation, the control module energizes these coils to open or close the fluid passages that modulate brake pressure when a wheel threatens to lock. The rear-left outlet valve coil is responsible for releasing pressure in that specific circuit. When the module sends a command and the electrical feedback does not match expectations—typically because the coil wiring has found an alternate path to ground—the self-diagnostics flag C1245, illuminate the ABS warning lamp, and may deactivate the entire anti-lock function as a precaution. Freeze frame data captured alongside the code records vehicle speed, brake input, and system voltages at the moment of detection, which helps pinpoint whether the fault occurred during hard braking or under light pedal pressure.

Understanding why this code appears requires recognizing that ABS depends on precise electrical feedback from each valve coil. The module does not simply send a command; it monitors the actual current draw to confirm the coil responded correctly. A short-to-ground allows current to flow even when the circuit should be open or high-resistance, creating a feedback signal that the module interprets as a fault. Over time, wiring insulation failures, connector corrosion, or physical damage to the harness near the suspension or wheel well can introduce this condition.

Common symptoms of C1245

• ABS warning lamp illuminated on the instrument cluster
• Anti-lock braking function disabled—standard braking remains active
• Inconsistent or pulsing brake pedal behavior during hard stops
• Reduced stability control intervention on affected vehicles equipped with combined ABS/ESC systems
• Possible triggering of related ABS fault codes in the same circuit family
• Unusual clicking or humming noises from the hydraulic unit when the ABS activates
• Increased stopping distance on slippery surfaces where anti-lock modulation would normally assist

What causes C1245?

• Damaged wiring insulation in the rear-left wheel well or along the ABS harness route
• Corroded or moisture-damaged connector at the hydraulic unit or wheel-speed sensor junction
• Failed ABS outlet valve coil winding inside the hydraulic control unit
• Short circuit inside the module itself affecting the valve driver circuit
• Chafed wiring from contact with suspension components or body panels
• Aftermarket audio or accessory installation that inadvertently tapped into ABS circuits

How to diagnose C1245

1. Connect a scan tool and confirm C1245 is stored. Record all available freeze frame data and check for any other active or pending ABS-related codes—multiple codes in the C12xx range often point to a common wiring or module issue.
2. Perform a visual inspection of the ABS wiring harness, paying close attention to areas near the rear suspension, wheel well, and where the harness crosses body seams. Look for cracked insulation, rubbed-through wires, or evidence of moisture intrusion at connectors.
3. Disconnect the affected connector and use a multimeter to check for continuity between the suspect circuit and ground. An ohm reading of near-zero ohms where infinite resistance is expected confirms a short-to-ground condition.
4. If the wiring checks out, the fault may lie within the hydraulic control unit itself. Swapping or bench-testing the pump module is typically beyond DIY capability and requires specialized equipment.
5. Consult manufacturer technical service bulletins for your specific make and model. Some vehicles have known issues with ABS valve coil circuits that receive software recalibrations or extended warranty coverage.
6. After addressing the root cause, clear the codes, perform a road test that includes simulated hard braking on a safe, low-traction surface, and verify that C1245 does not return and the ABS lamp extinguishes.

Repair options for C1245

• Repair damaged wiring or replace corroded connectors: $80–$250
• Replace the ABS hydraulic control unit if internal valve failure is confirmed: $450–$900 (parts alone; labor additional)
• Replace wheel-speed sensor and wiring harness if the short originates at that junction: $120–$300

How much does it cost to fix C1245?

Independent shop rates for parts and labor in the United States typically place a wiring repair between $80 and $250, making it the most affordable route when damage is localized. If the hydraulic control unit itself has failed, replacement parts run $450–$900 before labor, which can add another $150–$300 depending on vehicle accessibility. A full repair for C1245 therefore ranges from roughly $80 on the low end for a straightforward wiring fix to over $1,000 if the module requires replacement. Pinpointing the exact fault before purchasing components prevents unnecessary spending on parts that are not actually faulty.

Can you drive with C1245?

Drive with caution. The vehicle retains normal