C1267

Code

HYUNDAI C — Chassis

Oil Temperature. Sensor

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 15 EN: 17 RU: 22

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Page language: EN

Malfunction indicator lamp (MIL) or warning lamp may illuminate
Incorrect or no oil temperature reading on instrument cluster
Engine or transmission control strategies altered (poor shifting, limp behavior) when oil temp signal is used
Possible reduced engine performance or drivability complaints when the control module uses a fallback strategy
Possible visible oil leak at sensor mounting (if gasket or threads failed)

Read freeze-frame and live data with an OBD2 scan tool; verify oil temperature value and whether it is stable or erratic
Confirm DTC is current vs stored; check for related codes (engine/transmission)
Visually inspect sensor and connector for oil, corrosion, broken pins, or physical damage
Wiggle test wiring and connector while monitoring live data to reproduce intermittent faults
Measure sensor resistance at ambient and compare to expected characteristic (see signal parameters)
Backprobe sensor harness to check reference voltage and signal voltage with ignition ON and while engine warms

General type: temperature sensor (typically an NTC thermistor) — resistance decreases as temperature increases
Common output behavior: sensor is read by the module as a voltage (approx. 0.1–4.9 V across the operating range)
Approximate resistance examples (manufacturer-specific; confirm with service manual): ~2–3 kΩ at 20°C, ~200–500 Ω at 100°C (values vary by part)
Expected live-data temperature range: -40°C to +150°C depending on sensor specification; check for implausible fixed values (e.g., extreme high/low or 0°C)
Reference supply typically a stable pull-up or reference voltage from the module — verify per vehicle wiring diagram

Retrieve DTC and freeze-frame data with a scan tool. Note related codes and operating conditions when the code set.
Perform a visual inspection of the oil temperature sensor, harness, and connector for damage, oil ingress, corrosion, and secure mounting.
With ignition OFF, disconnect the sensor connector and inspect pins for corrosion or bent pins. Repair or clean as needed.
Measure sensor resistance at the sensor body with a digital multimeter and compare to expected resistance vs temperature (if possible, measure at known ambient temperature).
With connector connected, backprobe the signal and reference wires. With ignition ON and engine cold, verify reference voltage (or pull-up) and that signal voltage corresponds to ambient temperature. Monitor while warming engine for a smooth change.
Check wiring continuity between sensor connector and engine/ECM connector; check for shorts to ground or battery.
If electrical checks are good but signal still implausible, replace the oil temperature sensor and clear codes.
After repair, perform a test drive or warm-up cycle while monitoring live data to confirm proper temperature reading and that the code does not return.
If code returns after replacing sensor and verifying wiring, consider module input fault and consult factory wiring diagrams and technical service bulletins.

⚠️ Status

Oil Temperature Sensor Circuit Fault — check sensor, connector, wiring and module input (C1267).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C1267 — Oil Temperature. Sensor