C1208
ABS Inlet Valve Coil Rear Circuit Short To Battery
Chassis Chassis/Safety ABS Valve Circuit 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The ABS system's rear inlet valve coil is receiving too much electrical current, like a wire touching the positive battery terminal directly. This causes the ABS module to detect a short circuit in the valve's electrical circuit.

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Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Loss of ABS function; brakes lock up during emergency stopping
Possible grinding or clicking noise from rear brake area during braking
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ABS module monitors the coil resistance and voltage drop across the rear inlet valve solenoid circuit. When voltage is applied, the module expects a specific current draw; if voltage spikes to battery level or resistance drops too low, a short-to-battery fault is detected. The ECU continuously verifies circuit integrity during ABS initialization and operation.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Coil voltage drop 2-8 volts during activation Battery voltage (12V+) detected at coil
Circuit resistance 6-12 ohms Less than 2 ohms indicating short
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness and connectors
Inspect rear inlet valve wiring for damaged insulation, pinched wires, or corroded connectors; repair or reseat connections.
2
ABS inlet valve solenoid
Test coil resistance with multimeter; if below 2 ohms, replace the rear inlet valve solenoid assembly.
3
ABS control module relays
Check relay contacts for welding or corrosion that may force full voltage to the valve circuit; replace faulty relays.