C1247 — ABS Outlet Valve Coil RR Circuit Open

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

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm C1247 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
  4. Subsystem check Do a continuity test end-to-end on the ABS outlet valve coil RR circuit and wiggle the harness while measuring — intermittent opens show up as fluctuating readings.
  5. Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
  6. Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
  7. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1247 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1247 (parts and labor, USD, independent shop rates): Repair coil wiring or connector: $80–$250; Replace spark plugs: $90–$250; Replace an ignition coil: $150–$380. Overall, fixing C1247 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 does OBD2 code C1247 mean?

ABS Outlet Valve Coil RR Circuit Open (C1247): a chassis (brakes/steering/suspension) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

What is the most common cause of C1247?

The most common causes are: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

What are the symptoms of C1247?

Drivers most often notice: Check Engine Light on, hard starting, especially in damp weather, loss of power and jerking, misfires under load or at idle.

How much does it cost to fix C1247?

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

Is it safe to drive with C1247?

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.

When your vehicle's computer detects a problem with the right-rear anti-lock brake system valve, it logs trouble code C1247. This specific code flags an open circuit condition in the ABS outlet valve coil for the rear-right wheel. The ABS control module continuously monitors the electrical resistance and signal integrity of each valve coil. If the module cannot complete the expected electrical path through that particular coil circuit, it sets C1247 and illuminates the ABS warning light.

The term "circuit open" describes a break in the electrical path — current simply cannot flow where the module requires it. This type of fault typically stems from wiring issues, connector problems, or component failure. To set code C1247, the module compares live sensor data against factory-calibrated parameters, usually across multiple drive cycles. When the fault is stored, the system also saves a freeze frame snapshot capturing engine rpm, vehicle speed, brake pressure, and battery voltage at the exact moment of failure. That snapshot is invaluable during diagnosis because it reveals the conditions present when C1247 first appeared.

Understanding C1247 matters because the ABS outlet valve controls hydraulic pressure to the right-rear wheel during braking. When this circuit fails, the anti-lock and traction control systems for that wheel are disabled, which can cause the wheel to lock under hard braking or in low-traction situations.

Common Symptoms of C1247

  • ABS warning light stays on after engine start
  • Anti-lock braking disabled for the right-rear wheel
  • Traction control may be reduced or unavailable
  • Brake warning indicator could illuminate on some models
  • Wheel lock-up under hard braking without ABS modulation
  • In some cases, no noticeable drivability symptoms — only the warning light

What Causes C1247

The most frequent cause is a simple electrical interruption in the wiring harness or connector going to the right-rear ABS valve:

  • Blown fuse protecting the ABS valve circuit
  • Connector unplugged, pins backed out, or heavy corrosion at the valve connection
  • Broken or chafed wire in the right-rear ABS valve harness
  • Internally open ABS outlet valve coil (solenoid failure)
  • Damaged wiring insulation allowing bare copper to short or break
  • Poor ground connection at the ABS module
  • Corrosion inside the valve electrical junction

How to Diagnose C1247

Effective diagnosis follows a logical path from simple checks to complex ones:

  1. Connect an OBD2 scanner and confirm C1247 is stored. Save the freeze frame data immediately — it shows speed, rpm, and brake status when the fault occurred. Clear the code temporarily to see if it returns after a test drive.
  2. Check for other ABS-related codes (C1200 through C1205, or similar C-codes). Multiple codes often point to a shared problem like low system voltage or a failed pump motor.
  3. Inspect the technical service bulletins for your specific make and model. Many ABS faults have documented factory fixes or software recalibrations — search by VIN on the manufacturer website or nhtsa.gov.
  4. Visually examine the right-rear wheel area for damaged wiring, loose connectors, or corrosion. Pay special attention to the harness routing near suspension components where flex and abrasion cause failures.
  5. Perform a continuity test on the ABS outlet valve coil circuit end-to-end using a multimeter. Compare the measured resistance to factory specifications. A reading outside the acceptable range confirms an open coil. Wiggle the harness during testing to expose intermittent opens.
  6. If testing points to a failed valve coil, the component requires replacement — the coil is integrated into the hydraulic valve body and cannot be serviced separately.

Repair Options and Costs

Depending on what testing reveals, repair paths vary significantly in cost:

  • Wiring repair or connector replacement: $80–$250
  • ABS outlet valve coil replacement (valve body assembly): $250–$500
  • Fuses and minor electrical repairs: $20–$60

Labor times range from under an hour for simple wiring repairs to 2–3 hours for valve replacement, which requires brake system bleeding afterward.

Total Repair Cost for C1247

At independent shop rates, the total bill typically lands between $130 and $560 depending on the root cause. Wiring or connector issues run $80–$250 including diagnosis and labor. If the valve itself has failed internally, expect $300–$550 total. Always confirm the exact fault with multimeter testing before purchasing parts — the most expensive scenario is rarely the first one to check.

Can You Drive with C1247?

Drive with caution. Code C1247 disables anti-lock braking and traction control for the right-rear wheel, increasing the risk of wheel lock-up and skidding under hard braking or in slippery conditions. Have the fault diagnosed promptly, and if the brake warning light joins the ABS light, stop driving and address it immediately.