C109D
Low Vacuum Condition Detected
C109D is an OBD-II diagnostic trouble code meaning: Low Vacuum Condition Detected. Common causes: vacuum leak in lines or connections, vacuum pump malfunction. Estimated repair cost: $56–167.
Symptoms
- Reduced engine power
- Unstable idling
- Increased fuel consumption
Causes
- Vacuum leak in lines or connections
- Vacuum pump malfunction
- Clogged vacuum lines
- Damage to the vacuum brake booster
How to Fix
- Check the integrity of the vacuum lines
- Check connections for leaks
- Replace faulty vacuum pump
- Clear or replace clogged lines
Related codes
FAQ
What does the C109D code mean?
C109D is an OBD-II diagnostic trouble code that indicates: Low Vacuum Condition Detected
What causes a C109D error code?
The most common causes of C109D include: Vacuum leak in lines or connections; Vacuum pump malfunction; Clogged vacuum lines; Damage to the vacuum brake booster.
How do I fix a C109D diagnostic trouble code?
To fix C109D: Check the integrity of the vacuum lines. Check connections for leaks. Replace faulty vacuum pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C109D?
Limited driving only, diagnose soon
How much does it cost to fix C109D?
The estimated repair cost for C109D is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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