C1269

Motor Relay # 1 Circuit Short to Battery

Chassis Chassis/Safety ABS/Brake Control Relay 🔴 Serious — Stop or limit driving 🚫 Do Not Drive
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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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How Your ECU Detects This

Technical sensor logic and voltage thresholds

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

ParameterNormal RangeFault 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.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code C1269 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code C1269

What happens after you fix the fault

Once the fault is repaired, C1269 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.