P1187 GMC Code - Engine Oil Temperature Sensor Circuit Low Voltage
Quick Answer
The P1187 GMC code indicates a problem with the engine oil temperature sensor circuit, specifically that the voltage is lower than expected. Common causes include Faulty engine oil temperature sensor, Wiring or connector issues in the engine oil temperature sensor circuit, Low engine oil level. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1187 GMC indicates Engine Oil Temperature Sensor Circuit Low Voltage.
- Common causes
- Common causes include Faulty engine oil temperature sensor, Wiring or connector issues in the engine oil temperature sensor circuit, Low engine oil level.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1187 GMC Description
The P1187 GMC code indicates a problem with the engine oil temperature sensor circuit, specifically that the voltage is lower than expected. The engine oil temperature sensor is responsible for monitoring the temperature of the engine oil and sending this information to the engine control module (ECM). This data is crucial for the ECM to adjust various engine parameters such as fuel injection timing, ignition timing, and emission controls.
Common Causes of P1187 GMC
- Faulty engine oil temperature sensor
- Wiring or connector issues in the engine oil temperature sensor circuit
- Low engine oil level
- Engine oil temperature sensor circuit shorted to ground or power
- ECM software or hardware issues
Symptoms of P1187 GMC
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Engine overheating
- Poor acceleration or sluggish performance
How to Fix P1187 GMC
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the trouble codes and confirm the issue.
- Inspect the engine oil temperature sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
- Check the engine oil level and top up if low. Ensure the correct oil viscosity and type are being used.
- Test the engine oil temperature sensor circuit for continuity and proper voltage levels. Repair any wiring or connector issues as needed.
- Clear the trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1187 GMC
The cost of repairing a P1187 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of replacing an engine oil temperature sensor ranges from $50 to $150, while diagnosing and repairing wiring issues can cost between $100 and $300. Overall, the total repair cost for this issue typically falls within the range of $150 to $500, including parts and labor. It is recommended to consult with a certified mechanic for a more accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops can vary, so it's advisable to check local rates for a precise estimate.
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