C1269
Motor Relay # 1 Circuit Short to Battery
Chassis Chassis/Safety ABS/Brake Control Relay 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The motor relay circuit is shorted to battery voltage, meaning it's receiving constant power when it shouldn't be. Think of it like a light switch stuck in the 'on' position due to a crossed wire.

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Symptoms You May Notice
3 known symptoms for this code
ABS or traction control system malfunction
Brake system warning light illuminated
Loss of brake assist or reduced braking power
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors voltage across motor relay #1 circuit, expecting it to switch between ground and battery voltage based on system demand. When the circuit detects constant battery voltage instead of the proper switching pattern, it triggers the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Relay Circuit Voltage 0V (de-energized) or 12V (energized per demand) Constant 12V+ when de-energized
Relay Control Signal Proper PWM or on/off switching No switching detected or stuck high
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the motor relay connector at the ECU and relay module for corrosion or loose pins.
2
Motor relay #1
Replace the relay if it remains stuck in the energized position and cannot be de-energized.
3
Wiring and fuses
Check for pinched, melted, or shorted wiring in the motor relay circuit and replace damaged sections.