B1260

Solar Radiation Sensor Circuit Short To Battery

Body Engine Cooling Climate Control Sensor 🟢 Low — Fix at next service ✅ Safe to Drive
💬

What This Actually Means

In plain language — no jargon

The solar radiation sensor is sending a signal that's too high, like it's touching the battery's positive terminal instead of properly communicating with the ECU. This electrical short prevents the climate control system from accurately detecting sunlight intensity.

⚡

Symptoms You May Notice

3 known symptoms for this code
Climate control not functioning properly
Excessive cooling or heating regardless of sun exposure
Check Engine Light illuminated
🔬

How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the solar radiation sensor's voltage output to adjust cabin temperature dynamically. The sensor normally outputs a variable voltage between 0.5V and 4.5V based on detected sunlight intensity. A short to battery produces a continuous high voltage reading near 12V, triggering the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Sensor Voltage 0.5V - 4.5V (variable with sunlight) >5V or continuous high voltage near 12V
Circuit Resistance 500Ω - 100kΩ (varies with conditions) <100Ω (short to battery detected)
🔧

Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the solar sensor connector on the dashboard to ensure proper contact.
2
Solar radiation sensor wiring
Check wiring for abrasion or pinching between the sensor and ECU; repair or replace damaged sections.
3
Solar radiation sensor
Replace the sensor assembly if wiring inspection reveals no damage and fault persists.
⚠️

When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1260 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

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.
🔄

How to Clear Code B1260

What happens after you fix the fault

Once the fault is repaired, B1260 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.