C1202
ABS Outlet Valve Coil Rear Circuit Failure
Chassis Chassis/Safety ABS Solenoid Valve 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The ABS system's rear outlet valve solenoid coil has an electrical problem—like a broken wire in a light switch that prevents current from flowing. The ABS module detected abnormal resistance or voltage in the rear brake valve circuit.

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Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Reduced braking performance or hard brake pedal
ABS function disabled; vehicle reverts to standard braking
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ABS module monitors coil resistance and voltage across the rear outlet valve solenoid during operation. It compares measured resistance to expected range and detects open circuits, shorts, or excessive resistance indicating winding failure or wiring damage.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Coil Resistance 4–12 ohms (varies by model) >25 ohms or open circuit (∞ ohms)
Circuit Voltage 11–14V during activation 0V or erratic voltage spikes
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness and connectors (rear ABS valve)
Inspect for corrosion, pinched wires, or loose connectors at the rear outlet valve and ABS module; clean or reseat connectors.
2
Rear ABS outlet valve solenoid
Test coil resistance with a multimeter; replace solenoid coil if resistance is out of spec or infinite.
3
ABS module wiring and relay
Check ABS module power and ground circuits with a multimeter; repair broken wires or corroded grounds.