P0668 BMW Code - DME Internal Fault Interior Temperature Sensor Signal
Quick Answer
The P0668 BMW code indicates a fault within the Digital Motor Electronics (DME) system related to the interior temperature sensor signal. Common causes include Interior temperature sensor failure, Wiring harness issues, DME malfunction. 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
- P0668 BMW indicates DME Internal Fault Interior Temperature Sensor Signal.
- Common causes
- Common causes include Interior temperature sensor failure, Wiring harness issues, DME malfunction.
- 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 P0668 BMW Description
The P0668 BMW code indicates a fault within the Digital Motor Electronics (DME) system related to the interior temperature sensor signal. The interior temperature sensor is responsible for monitoring the temperature inside the vehicle and providing this information to the DME for proper engine operation. When this sensor signal is compromised, it can lead to various performance issues and potentially affect the overall functionality of the vehicle.
Common Causes of P0668 BMW
- Interior temperature sensor failure
- Wiring harness issues
- DME malfunction
- Corrosion or damage to sensor connections
- Electrical system faults
Symptoms of P0668 BMW
- Check engine light illuminated
- Poor fuel efficiency
- Rough idle or stalling
- Engine misfires
- Difficulty starting the engine
How to Fix P0668 BMW
- Diagnose the issue by performing a comprehensive scan using a diagnostic tool to retrieve the fault code and inspect the interior temperature sensor and its connections.
- Test the sensor's resistance and voltage output to determine if it is functioning correctly.
- Replace the interior temperature sensor if it is faulty, ensuring proper installation and connection.
- Check the wiring harness for any damage or corrosion, repairing or replacing as needed.
- Clear the fault code from the DME memory and reset the system to ensure proper operation.
Cost to Fix P0668 BMW
The typical repair costs for addressing a P0668 BMW code can range from $200 to $500, including parts and labor. However, it is essential to note that specific diagnosis time, labor rates, and part prices can vary depending on the location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher at dealerships or metropolitan areas. Independent shops may offer lower labor rates, so it is advisable to inquire locally for a more accurate estimate.
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Frequently Asked Questions about P0668 BMW Code
1. What does OBDII code P0668 mean on a BMW?
P0668 on a BMW indicates a "DME Internal Fault - Interior Temperature Sensor Signal," meaning the engine control module (DME) has detected an issue with the interior temperature sensor's signal.
2. What are the symptoms of code P0668 in a BMW?
Common symptoms include poor engine performance, rough idling, unexpected temperature gauge readings, or the check engine light illuminating.
3. What causes the P0668 code on a BMW?
Possible causes include a faulty interior temperature sensor, wiring issues, a damaged DME, or electrical interference affecting the sensor's signal.
4. How do I diagnose the P0668 code on my BMW?
Diagnosis involves scanning the DME for stored codes, inspecting the interior temperature sensor and its wiring, and testing the sensor’s signal output with a multimeter.
5. Can a faulty DME cause the P0668 code?
Yes, a malfunctioning DME can misinterpret or fail to process the interior temperature sensor’s signal, triggering the P0668 code.
6. Is it safe to drive with the P0668 code on a BMW?
Driving may be possible, but it’s not recommended as the issue can affect engine performance or lead to further damage if unresolved.
7. How can I fix the P0668 code on my BMW?
Repairs may include replacing the interior temperature sensor, repairing or replacing damaged wiring, or reprogramming or replacing the DME if it’s faulty.
8. How much does it cost to fix the P0668 code on a BMW?
The cost depends on the root cause. Replacing a sensor might cost $100-$300, while DME repairs or replacements can run $1,000 or more.
9. Can I clear the P0668 code without repairing it?
Clearing the code without addressing the issue may temporarily turn off the check engine light, but the code and symptoms are likely to return.
10. What tools are needed to troubleshoot the P0668 code?
You’ll need an OBDII scanner, a multimeter for electrical testing, and potentially a wiring diagram for your specific BMW model.
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