What Does C1253 Mean?
The ABS control module has detected a short to ground on the left rear ABS inlet valve coil circuit. The valve driver is seeing an unintended low-resistance path to ground, which can cause excessive current draw, damage the valve driver, or prevent proper valve control during ABS braking events.
Safety Warning
ABS inlet valve control is lost at the left rear wheel. Anti-lock braking is compromised, and the ground short may cause further electrical damage if not repaired promptly.
Common Causes
35%
Inlet valve coil winding insulation breakdown allowing contact with the grounded valve body
25%
Pinched internal wiring contacting the grounded ABS module housing
25%
Brake fluid leaking from the modulator into the electronic module and creating a ground path
15%
Corrosion at the module-to-modulator connector creating a low-resistance ground path
Diagnostic Steps
1
Step 1: Separate the ABS module from the hydraulic modulator. Measure resistance from each left rear inlet valve coil terminal to the modulator body. Less than 10K ohms confirms a coil-to-ground short.
2
Step 2: On the module side, measure resistance from the valve driver pins to module ground to determine if the short is in the module electronics.
3
Step 3: Inspect the modulator-to-module mating surface for signs of brake fluid seepage indicating a seal failure.
4
Step 4: If the module is separable, examine the circuit board for corrosion, solder bridges, or component damage near the left rear inlet valve driver circuit.
5
Step 5: Replace the shorted component, ensure fresh brake fluid throughout the system, perform ABS bleed, clear codes, and verify all valve operations via bidirectional control.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The ABS control module has detected a short to ground on the left rear ABS inlet valve coil circuit. The valve driver is seeing an unintended low-resistance path to ground, which can cause excessive current draw, damage the valve driver, or prevent proper valve control during ABS braking events.
The most common cause of C1253 (ABS Inlet Valve Coil LR Circuit Short To Ground) is: Inlet valve coil winding insulation breakdown allowing contact with the grounded valve body
Typical repair costs for C1253 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS inlet valve control is lost at the left rear wheel. Anti-lock braking is compromised, and the ground short may cause further electrical damage if not repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1253 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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