C1247 — ABS Outlet Valve Coil RR Circuit Open #

The code description may vary depending on the vehicle manufacturer (OEM). Below is a list of known label variations for C1247:

• Toyota/Lexus: ABS Outlet Valve Coil RR Circuit Open
• Hyundai/Kia: ABS Outlet Valve Right Rear Circuit Open
• Mazda: ABS RR Outlet Valve Circuit Malfunction
• Ford: Right Rear ABS Outlet Valve Electrical Open Circuit

Code summary for C1247 #

The C1247 diagnostic trouble code (DTC) identifies an electrical open circuit in the Anti-lock Braking System (ABS) outlet valve coil for the right rear (RR) wheel. The ABS is a safety system designed to prevent wheel lockup during braking by modulating brake pressure. Each wheel has inlet and outlet valves controlled by solenoids (electromagnetic coils) which the ABS control module actuates. When the module detects an open circuit in the right rear outlet valve coil, it sets the C1247 code and may disable certain ABS functions as a precaution. This issue can compromise stability and braking performance, especially in slippery conditions.

Common symptoms for code C1247 #

When the C1247 code is present, you may notice several warning signs indicating ABS system malfunction. The most obvious is the ABS warning light illuminated on the dashboard. In some cases, additional lights such as the brake warning or traction control indicator may also appear. You might experience changes in braking feel, especially during hard stops or on slippery roads, as the ABS system may not function as intended.

• ABS warning light is ON
• Traction control or brake warning lights may be illuminated
• ABS system inoperative (wheels can lock under hard braking)
• Reduced stability or traction during emergency stops
• Possible changes in brake pedal feel

Most probable causes for code C1247 #

The C1247 code typically results from issues that interrupt the electrical circuit controlling the right rear ABS outlet valve coil. These can range from simple wiring problems to faults in the ABS control module itself. Below is an ordered list of likely causes, from most to least common:

1. Damaged or corroded wiring/connectors at the right rear ABS valve or harness
2. Faulty ABS outlet valve coil (the solenoid inside the hydraulic control unit)
3. Defective ABS control module (rare, but possible if all else checks out)
4. Broken or backed-out terminal pins in related connectors
5. Previous brake fluid leaks causing contamination or corrosion

Step-by-step diagnostic for code C1247 #

Diagnosing a C1247 code requires a systematic approach to pinpoint whether the problem lies in the wiring, the valve coil, or the ABS module. Always start with the basics: visual inspection and connector checks, then follow with electrical testing. Here’s a proven step-by-step method:

• 1. Scan for additional codes: Use a professional-grade scan tool to check for related ABS or brake system codes that might offer more clues.
• 2. Visual inspection: Inspect the wiring harness and connectors at the right rear wheel and ABS module for damage, corrosion, or loose connections.
• 3. Check ABS fuse and power supply: Ensure the ABS fuse is not blown and that the module receives proper voltage.
• 4. Test continuity: Using a multimeter, check for continuity between the ABS module and the right rear valve coil. Open circuits indicate wiring faults.
• 5. Check coil resistance: Measure the resistance of the right rear outlet valve coil at the hydraulic control unit. Compare to OEM specifications (typically 2–5 Ohms; refer to service manual).
• 6. Wiggle test: While monitoring resistance, wiggle the harness to identify intermittent faults.
• 7. Check for short to ground/power: Ensure there are no shorts which could trigger the code.
• 8. ABS module test/substitution: If all wiring and coil tests pass, suspect the ABS module itself (consult OEM test procedures).

Possible repairs for code C1247 #

Repairing a C1247 code targets the underlying fault that’s breaking the electrical circuit. Here are the most effective repairs based on the root cause identified during diagnosis:

• Repair or replace damaged wiring and connectors to the right rear ABS valve
• Clean corroded terminals and apply dielectric grease to prevent future oxidation
• Replace the ABS outlet valve coil (part of the hydraulic control unit) if resistance is out of spec
• Repair or replace the ABS control module only if confirmed faulty
• Clear codes and test drive to verify proper operation and that the ABS warning light stays off

Is it safe to drive with C1247? #

Driving is possible but not recommended when the C1247 code is present. The standard hydraulic brakes will continue to function, but the ABS system is disabled, meaning you risk wheel lockup and loss of steering control during emergency stops or on slippery surfaces. If the brake warning light is also on, there may be additional issues affecting braking safety. It’s best to have the vehicle inspected and repaired promptly to restore full braking performance and safety.

Vehicles most commonly affected by C1247 #

While C1247 can appear on various makes and models, it is more frequently reported in vehicles from manufacturers that use similar ABS hydraulic control unit designs and wiring layouts. This includes many mid-2000s and newer cars, SUVs, and trucks. Examples include:

• Toyota and Lexus (e.g., Camry, Corolla, RAV4, RX series)
• Hyundai and Kia (e.g., Sonata, Tucson, Optima, Sportage)
• Mazda (e.g., Mazda3, CX-5, Mazda6)
• Ford (e.g., Escape, Explorer, Fusion)
• Some Nissan and Infiniti models

Common mistakes & best practices for C1247 #

Addressing the C1247 code can be straightforward if you avoid common pitfalls and apply proven diagnostic techniques. Here are typical errors to watch out for, along with good habits:

• Assuming the ABS control module is faulty without checking wiring and coil resistance first
• Overlooking hidden corrosion inside connectors, especially after winter or fluid leaks
• Replacing the hydraulic control unit unnecessarily when the fault is in the wiring
• Not clearing the code after repairs, which may leave the ABS system disabled
• Always verify repairs with a test drive and confirm that all warning lights stay off

Quick FAQ for code C1247 #

Still have questions? Here are answers to some of the most common concerns about the C1247 code:

• Q: Can I reset the C1247 code myself?
  A: You can clear the code with a scan tool, but if the underlying fault isn’t fixed, the code and warning light will return almost immediately.
• Q: Does this code mean my brakes are failing?
  A: Not directly—your basic braking will continue to work, but the ABS function is compromised, increasing risk on slippery roads or during emergency stops.
• Q: How urgent is it to fix this code?
  A: It’s important to address promptly for your safety, especially if you drive in conditions where ABS is critical (rain, snow, heavy traffic).