C1166 Code - Suction Valve 1
Quick Answer
The Suction Valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated. Common causes include Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit), ABS Actuator and Electric Unit harness is open or shorted, ABS Actuator and Electric Unit circuit poor electrical connection. 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
- C1166 indicates Suction Valve 1.
- Common causes
- Common causes include Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit), ABS Actuator and Electric Unit harness is open or shorted, ABS Actuator and Electric Unit circuit poor electrical connection.
- 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 C1166 Description
What are the Possible Causes of the DTC C1166?
- Faulty Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit)
- ABS Actuator and Electric Unit harness is open or shorted
- ABS Actuator and Electric Unit circuit poor electrical connection
How to Fix the DTC C1166?
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 C1166 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.
Need more information about the C1166 code?
Need more information on how to fix the C1166 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1166 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C1166 Infiniti — Suction Valve 1
- C1166 Nissan — Suction Valve 1
Frequently Asked Questions about C1166 Code
1. What are common symptoms of OBDII code C1166 (Suction Valve 1)?
- Common symptoms include poor braking performance, illuminated ABS warning light, and difficulty maintaining control while braking.
2. What does OBDII code C1166 (Suction Valve 1) indicate?
- This code indicates an issue with the suction valve 1 in the ABS system, affecting brake pressure modulation during operation.
3. What are possible causes of OBDII code C1166?
- Possible causes include a faulty suction valve, damaged wiring or connectors, low brake fluid levels, or issues with the ABS control module.
4. How can I diagnose the cause of OBDII code C1166?
- Diagnosis involves inspecting the suction valve 1, checking for damaged wiring, verifying brake fluid levels, and performing a scan tool test of the ABS system.
5. Can I continue driving with OBDII code C1166 present?
- It is not recommended to continue driving with this code as it can affect the proper functioning of the ABS system and compromise braking performance.
6. How can I repair OBDII code C1166 (Suction Valve 1)?
- Repair may involve replacing the faulty suction valve, repairing damaged wiring, ensuring proper brake fluid levels, or addressing issues with the ABS control module.
7. Are there any DIY tips for fixing OBDII code C1166?
- DIY tips include checking and cleaning connectors, inspecting for visible damage, and ensuring proper brake fluid levels before seeking professional assistance if needed.
8. How important is it to address OBDII code C1166 promptly?
- It is essential to address this code promptly to ensure the ABS system functions correctly and to maintain optimal braking performance and vehicle safety.
9. Are there any safety concerns associated with OBDII code C1166?
- Yes, safety concerns include compromised braking performance, potential loss of control during braking, and increased risk of accidents if the issue is not addressed promptly.
10. Can a mechanic reset OBDII code C1166 after repairs are made?
- Yes, a mechanic can reset the code using a scan tool after the underlying issue has been repaired to clear the ABS system's error code memory.
Discuss the causes and fixes for C1166 OBDII Code
Code C1166 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
