How severe is fault code C1207?

Serious — Stop or limit driving

OBD Code C1207: ABS Inlet Valve Coil Rear Circuit Open

Q: What does OBD code C1207 mean?

ABS Inlet Valve Coil Rear Circuit Open. The ABS system's rear inlet valve coil has an open electrical circuit, meaning the solenoid can't receive power to control brake fluid pressure during ABS activation. Think of it like a broken wire preventing electricity from reaching a light switch.

Q: What are the symptoms of fault code C1207?

ABS warning light illuminated on dashboard, ABS system disabled; brakes work normally but without anti-lock protection, Possible brake pulsation during hard braking on slippery surfaces

Q: How do I fix OBD fault code C1207?

Inspect and reseat the connector at the rear axle ABS valve; clean corrosion with electrical contact cleaner.. Check the wiring harness for breaks, abrasion, or pinch points along the route to the rear axle and repair or splice if damaged.. Replace the entire valve unit if the coil is internally open or shorted; typically bolted to the ABS module or rear axle housing.

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What This Actually Means

In plain language — no jargon

The ABS system's rear inlet valve coil has an open electrical circuit, meaning the solenoid can't receive power to control brake fluid pressure during ABS activation. Think of it like a broken wire preventing electricity from reaching a light switch.

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Symptoms You May Notice

3 known symptoms for this code

ABS warning light illuminated on dashboard

ABS system disabled; brakes work normally but without anti-lock protection

Possible brake pulsation during hard braking on slippery surfaces

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Embedded Systems Insight

What the ECU/ECM is actually computing

The ABS module continuously monitors the coil circuit resistance and current draw during valve activation commands. When the solenoid coil opens or the wiring breaks, the ECU detects zero or extremely high resistance instead of the expected coil impedance, triggering the fault code.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Coil Resistance	4–12 ohms (depending on design)	>100 ohms or open circuit (infinite resistance)
Solenoid Current Draw	0.5–2.0 amps during activation	<0.1 amps or no current detected

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

ABS wiring harness connector (rear inlet valve)

Inspect and reseat the connector at the rear axle ABS valve; clean corrosion with electrical contact cleaner.

2

ABS inlet valve coil wiring

Check the wiring harness for breaks, abrasion, or pinch points along the route to the rear axle and repair or splice if damaged.

3

ABS rear inlet solenoid valve assembly

Replace the entire valve unit if the coil is internally open or shorted; typically bolted to the ABS module or rear axle housing.