How severe is fault code C1242?

Serious — Stop or limit driving

OBD Code C1242: ABS Outlet Valve Coil LR Circuit Failure

Q: What does OBD code C1242 mean?

ABS Outlet Valve Coil LR Circuit Failure. The ABS system's outlet valve coil for the left rear wheel isn't responding properly to electrical signals, like a speaker that won't turn on when you try to use it. This prevents the ABS from controlling brake pressure at that wheel during emergency braking.

Q: What are the symptoms of fault code C1242?

ABS warning light illuminated on dashboard, Loss of ABS function; brakes lock up during hard braking, Possible extended stopping distance or reduced brake modulation

Q: How do I fix OBD fault code C1242?

Inspect and clean the LR outlet valve connector; reseat it firmly to eliminate poor contact.. Check for corroded, pinched, or damaged wires between the ABS module and left rear valve; repair or replace as needed.. If wiring is intact, replace the failed left rear outlet valve solenoid coil assembly.

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What This Actually Means

In plain language — no jargon

The ABS system's outlet valve coil for the left rear wheel isn't responding properly to electrical signals, like a speaker that won't turn on when you try to use it. This prevents the ABS from controlling brake pressure at that wheel during emergency braking.

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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 hard braking

Possible extended stopping distance or reduced brake modulation

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Embedded Systems Insight

What the ECU/ECM is actually computing

The ABS module monitors the coil resistance and electrical continuity of the left rear outlet valve solenoid. It applies a test voltage and checks for proper current draw; if resistance is open, shorted, or out of range, the fault is logged.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Coil Resistance	4–8 ohms (typical solenoid)	Open circuit (infinite) or short (<1 ohm)
Voltage Response	12V applied, current flows	No current detected or excessive current spike

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Wiring harness connector and pins

Inspect and clean the LR outlet valve connector; reseat it firmly to eliminate poor contact.

2

Wiring harness (LR outlet valve circuit)

Check for corroded, pinched, or damaged wires between the ABS module and left rear valve; repair or replace as needed.

3

ABS outlet valve solenoid (LR)

If wiring is intact, replace the failed left rear outlet valve solenoid coil assembly.