ABS Outlet Valve Coil RR Circuit Open

What is C1247?

C1247 indicates an open circuit in the ABS outlet valve coil for the rear right wheel, meaning the ABS system cannot properly control brake pressure to that wheel. This is a high-severity issue that disables ABS functionality and can cause dangerous brake bias or wheel lockup, especially under hard braking. Based on real owner reports, this code frequently appears in Chevrolet Corvettes and is often linked to known EBCM (Electronic Brake Control Module) failures or wiring/brake line routing problems.

Common Causes

• ●A known EBCM (Electronic Brake Control Module) failure, mentioned as a recurring issue by multiple Corvette owners
• ●Faulty wiring or poor brake line routing, with owners specifically criticizing GM's design after moving away from a rear-mounted ABS module
• ●General electrical circuit faults in the ABS outlet valve coil circuit for the rear right wheel

Symptoms You May Notice

• ●Illuminated ABS warning light on the dashboard
• ●Experienced front wheel lockup under hard braking, with owners reporting crashes due to loss of brake control
• ●Heavy brake bias to the front, reducing rear braking effectiveness
• ●Excessive brake dust on wheels, prompting owners to switch pad compounds

How to Fix It

• ●Replace the EBCM module (cost and difficulty not specified in provided data, but implied as a known failure point)
• ●Repair or replace faulty brake lines and correct routing issues (owner-reported DIY activity involving bending and installing new lines)
• ●Replace brake pads with ceramic compounds to reduce dust, though this is a symptom mitigation not a fix for the code ($130 for all four wheels, moderate DIY difficulty)
• ●Perform a complete brake system overhaul including master cylinder and proportioning valve (reported cost under $700, high DIY difficulty)