P0668 BMW Code - DME Internal Fault Interior Temperature Sensor Signal
Quick Answer
The control solenoid (w/body and TCM) valve assembly has a built-in TCM temperature sensor to detect possible overtemperature conditions of the Transmission Control Module (TCM). Common causes include Obstructions in the airflow of the radiator or transmission cooler, Kinked or damaged transmission fluid lines, Damage to the transmission cooler. 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 Obstructions in the airflow of the radiator or transmission cooler, Kinked or damaged transmission fluid lines, Damage to the transmission cooler.
- 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.
Code P0668 BMW Description
What are the Possible Causes of the DTC P0668 BMW?
- Obstructions in the airflow of the radiator or transmission cooler
- Kinked or damaged transmission fluid lines
- Damage to the transmission cooler
How to Fix the DTC P0668 BMW?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0668 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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