C1243
ABS Outlet Valve Coil LR Circuit Open
Chassis Chassis/Safety ABS Solenoid Circuit 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The ABS system's left rear outlet valve solenoid coil has lost electrical connection, like a broken wire in a lamp preventing it from turning on. Your ABS won't function properly on the left rear wheel during braking.

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Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Reduced or absent ABS function on left rear wheel
Vehicle may pull to one side during hard braking
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU continuously monitors the solenoid coil resistance and current draw when commanding the ABS outlet valve. It detects an open circuit condition when no current flows despite sending an activation signal, indicating a broken wire or failed coil.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Coil Resistance 4-12 ohms Open circuit / infinite ohms
Coil Current Draw 0.4-1.5 amps 0 amps or no measurable current
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
ABS wiring harness connector
Inspect and reseat the left rear ABS valve connector at the modulator unit for corrosion or loose pins.
2
ABS outlet valve solenoid coil
Replace the left rear solenoid coil if wiring is intact; requires removing the ABS modulator and unbolting the valve.
3
ABS modulator unit
Replace entire ABS modulator if internal wiring or coil cannot be accessed; typically dealer-level repair.