C1247 — ABS Outlet Valve Coil RR Circuit Open #

Note: The wording of this trouble code may vary depending on the vehicle manufacturer (OEM). Below are some known variations:

• C1247 — ABS Outlet Valve Coil RR Circuit Open (Toyota, Lexus, Subaru, Suzuki)
• C1247 — Rear Right ABS Outlet Valve Circuit Open (Hyundai, Kia)
• C1247 — ABS Solenoid Valve RR Outlet Circuit Malfunction (Mazda)
• C1247 — ABS Hydraulic Valve RR Outlet Circuit Open (Nissan, Infiniti)

Code summary for C1247 #

The C1247 diagnostic trouble code (DTC) signals an open circuit issue with the Anti-lock Braking System (ABS) outlet valve coil for the Rear Right (RR) wheel. This coil is part of the ABS hydraulic control unit and manages brake fluid pressure to prevent wheel lock-up during hard braking. When the vehicle’s Electronic Control Unit (ECU) detects an abnormal or open electrical path in this circuit, it triggers the C1247 code. This code often disables the ABS function for safety, relying instead on conventional braking. While not always affecting everyday drivability, it can compromise safety in emergency or slippery conditions.

Common symptoms for code C1247 #

When the C1247 code is stored, you might notice several warning signs related to the ABS system. These symptoms can range from subtle to obvious, depending on the severity of the issue and your vehicle’s fail-safe protocols. Typical signs include:

• ABS warning light illuminated on the dashboard
• Traction control or stability control warning lights (may also turn on)
• Loss of ABS function — wheels may lock up under hard braking
• Normal brake operation remains, but without ABS assistance
• Possible DTCs for related ABS or wheel speed sensors

Probable causes for code C1247 #

The C1247 code is most frequently triggered by electrical issues in the ABS outlet valve circuit for the rear right wheel. The causes, ordered from most to least common, include:

1. Open or broken wiring harness between the ABS control module and the RR outlet valve
2. Corroded or loose electrical connectors at the ABS hydraulic control unit
3. Faulty ABS hydraulic control unit (internal solenoid coil failure)
4. Water intrusion or contamination in connectors or the ABS module
5. Damaged or shorted circuit from physical impact or road debris
6. Blown fuse (less common, but possible)

Step-by-step diagnostics for code C1247 #

Diagnosing C1247 involves a logical approach to pinpoint the root cause. Expert technicians use a combination of visual inspection, electrical testing, and sometimes advanced scan tools. Here’s a typical workflow:

• 1. Confirm the code with a professional OBD-II/EOBD scan tool and check for related ABS codes.
• 2. Visually inspect the ABS wiring harness and connectors at the rear right wheel and ABS module for damage, corrosion, or loose connections.
• 3. Test circuit continuity between the ABS control module and the RR outlet valve using a multimeter (look for open or high-resistance circuits).
• 4. Inspect for water intrusion or contamination in connectors and the ABS module.
• 5. Check related fuses in the fuse box for the ABS system.
• 6. If wiring and connections are good, test the ABS hydraulic control unit (as per OEM procedures) — verify coil resistance for the RR outlet valve.
• 7. Clear codes and perform a test drive to see if C1247 returns.

Possible repairs for code C1247 #

Repairing C1247 depends on the outcome of your diagnostics. The focus should always be on addressing the root cause to ensure ABS system integrity. Common repairs include:

• Repair or replace damaged wiring between the ABS module and the rear right outlet valve
• Clean and secure connectors at the ABS hydraulic control unit
• Replace corroded or contaminated connectors
• Replace the ABS hydraulic control unit if the internal coil is faulty (OEM or high-quality remanufactured part recommended)
• Repair or replace blown fuses and address underlying electrical issues

Is it safe to drive with code C1247? #

Limited — Caution Advised: Driving with the C1247 code is generally safe for routine use because basic braking remains functional; however, the ABS system is disabled. This means your vehicle can lose stability and experience wheel lock-up during emergency, hard, or slippery surface braking. If you must drive, do so with extra caution and get the issue resolved as soon as possible, especially before driving in rain, snow, or other low-traction conditions.

Vehicles most commonly affected by code C1247 #

While C1247 can appear on many vehicles equipped with ABS, it is most frequently reported on models from Japanese and Korean OEMs, particularly:

• Toyota (Camry, Corolla, Prius, RAV4, Highlander)
• Lexus (ES, RX, IS series)
• Subaru (Forester, Outback, Legacy)
• Suzuki (Grand Vitara, SX4)
• Hyundai (Sonata, Santa Fe, Elantra)
• Kia (Sportage, Sorento, Optima)
• Mazda (Mazda3, Mazda6, CX-5)
• Nissan (Altima, Rogue, Sentra)
• Infiniti (G35, QX60)

Common mistakes and best practices for code C1247 #

When troubleshooting C1247, certain missteps can lead to wasted time or incomplete repairs. Keep these points in mind:

• Do not replace the ABS module immediately — always check wiring and connectors first.
• Overlooking water or corrosion in connectors is a frequent oversight.
• Failing to clear codes and retest after repair can hide persistent issues.
• Use only OEM or high-quality replacement parts for ABS components to ensure reliability.
• Follow OEM diagnostic flowcharts if available, as some models have specific test procedures.

Quick FAQ for code C1247 #

Here are some rapid-fire answers to common questions about C1247:

• Q: Will my brakes still work with C1247 set?
  A: Yes, normal braking remains, but the ABS function is lost. Drive with extra caution, especially on slippery roads.
• Q: Is it safe to clear the C1247 code without repair?
  A: Clearing the code without fixing the root cause will not restore ABS function and the code will likely return. Always diagnose and repair before clearing.
• Q: Can a simple loose connector cause C1247?
  A: Absolutely. Loose or corroded connectors are among the most common causes. Always inspect them first.