What Does C1248 Mean?
The ABS control module has detected a short to battery voltage on the right rear ABS outlet valve coil circuit. The module is seeing unwanted battery voltage on the valve driver circuit, which could cause the valve to energize continuously or damage the driver circuitry. This disables proper ABS pressure modulation at the right rear wheel.
Safety Warning
A short to battery on the outlet valve could cause unintended valve activation or ABS module damage. ABS is disabled, increasing wheel lockup risk during emergency stops. Repair immediately.
Common Causes
35%
Chafed wiring allowing the valve coil circuit to contact a battery voltage source inside the ABS module or harness
25%
Shorted valve coil winding contacting a powered circuit inside the hydraulic modulator
25%
ABS module circuit board failure with a shorted valve driver transistor applying constant voltage
15%
Moisture or contamination inside the ABS module creating a conductive bridge to a powered trace
Diagnostic Steps
1
Step 1: Disconnect the ABS module from the hydraulic unit. Measure voltage on the valve coil wires at the module connector with key on. No voltage should be present unless the module is commanding the valve.
2
Step 2: Measure resistance from each valve coil wire to battery positive. Any reading less than OL indicates a short to battery voltage in the wiring.
3
Step 3: Inspect the ABS module circuit board (if separable) for burnt components, corrosion, or solder bridges near the right rear outlet valve driver circuit.
4
Step 4: Check the hydraulic modulator valve coil insulation by measuring resistance from each coil terminal to the positive supply rail.
5
Step 5: Replace the faulted component. After repair, clear codes and use a bidirectional scan tool to verify all four outlet valves respond correctly to commanded activation.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The ABS control module has detected a short to battery voltage on the right rear ABS outlet valve coil circuit. The module is seeing unwanted battery voltage on the valve driver circuit, which could cause the valve to energize continuously or damage the driver circuitry. This disables proper ABS pre...
The most common cause of C1248 (ABS Outlet Valve Coil RR Circuit Short To Battery) is: Chafed wiring allowing the valve coil circuit to contact a battery voltage source inside the ABS module or harness
Typical repair costs for C1248 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short to battery on the outlet valve could cause unintended valve activation or ABS module damage. ABS is disabled, increasing wheel lockup risk during emergency stops. Repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1248 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS)
Difficulty
Type
Manufacturer
Recommended Tools
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