Clutch Position Sensor Circuit Short to Battery
Diagnostic trouble code C1133 indicates that the clutch position sensor circuit has a short to battery voltage. This sensor tells the ECM/BCM whether the clutch pedal is pressed or released, which is critical for cruise control, engine start, and transmission operation. A short to battery means the control module sees a constant high voltage signal regardless of actual pedal position, potentially preventing the engine from starting or causing malfunctions in systems that rely on this input.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty clutch position sensor with internal short
- Wiring harness shorted to 12V power source
- Corroded or pinched connector at the sensor
- ECM/BCM internal failure in the input circuit
- Improper previous electrical repair or modification
3. Symptoms You Will Notice
- Engine may not start or cranks but won't run
- Cruise control inoperative or erratic
- Transmission shift issues (if applicable)
- Check Engine Light or warning message on dash
4. Step-by-Step Diagnosis
Scan for codes and verify C1133 is present
Inspect clutch position sensor connector for corrosion, damage, or bent pins
Measure voltage at sensor signal wire with key on; should toggle between ~0V (released) and ~12V (pressed). If stuck at 12V, suspect short to battery
Disconnect sensor and check if voltage drops to 0V; if not, repair short in wiring
If wiring and connector are good, replace clutch position sensor
If problem persists, test ECM/BCM input circuit per manufacturer procedure
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may be undriveable if the engine won't start. If it does start, cruise control and transmission functions may be affected. It's best to have it diagnosed promptly to avoid further issues.
How much does it cost to fix?▼
Typically $100–$300, including a new sensor ($30–$80) and labor (0.5–1.5 hours). Wiring repairs may add $50–$150.