C1961

Park Lamp Relay Coil Circuit Failure

Chassis Chassis/Safety Lighting Control Relay 🔴 Serious — Stop or limit driving 🚫 Do Not Drive
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What This Actually Means

In plain language — no jargon

The park lamp relay coil circuit has an electrical failure, meaning the relay that controls your parking lights isn't receiving or maintaining proper power. It's like a light switch that's broken and won't flip to turn on the lamps.

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Symptoms You May Notice

3 known symptoms for this code
Park lamps do not illuminate when activated
Park lamps remain on continuously or flicker intermittently
Dashboard warning light or fault code display
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors voltage and current draw across the park lamp relay coil circuit. When the relay is commanded on, the ECU expects specific voltage levels and coil resistance within normal parameters. A failure is detected when voltage or resistance readings fall outside expected thresholds, indicating an open, short, or failed relay coil.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Relay Coil Voltage 11-14V when relay engaged <5V or >15V; no voltage change on command
Coil Resistance 60-120 ohms nominal <10 ohms (short) or >500 ohms (open)
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Park lamp relay
Locate the relay in the fuse/relay panel, note its position, and swap it with an identical relay from another circuit to test if the fault clears.
2
Relay socket and wiring connectors
Inspect the relay socket for corrosion, burnt contacts, or loose pins, and clean or reseat connectors firmly.
3
Park lamp switch and wiring harness
Check continuity along the park lamp circuit from the switch through the relay to ground using a multimeter.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code C1961 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 C1961

What happens after you fix the fault

Once the fault is repaired, C1961 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.