U1159 RAM Code - Lost Communication With Automatic Sway Bar System Module
Quick Answer
The Diagnostic Trouble Code (DTC) sets if the Occupant Restraint Controller (ORC) BUS messages not received from the Automatic Sway Bar System Module (ASBS) or Final Drive Control Module (FDCM) for approximately two to five seconds. Common causes include Faulty Automatic Sway Bar System Module (ASBS) or Final Drive Control Module (FDCM), ASBS or FDCM harness is open or shorted, ASBS or FDCM 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
- U1159 RAM indicates Lost Communication With Automatic Sway Bar System Module.
- Common causes
- Common causes include Faulty Automatic Sway Bar System Module (ASBS) or Final Drive Control Module (FDCM), ASBS or FDCM harness is open or shorted, ASBS or FDCM 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 U1159 RAM Description
What are the Possible Causes of the DTC U1159 RAM?
- Faulty Automatic Sway Bar System Module (ASBS) or Final Drive Control Module (FDCM)
- ASBS or FDCM harness is open or shorted
- ASBS or FDCM circuit poor electrical connection
- Faulty Occupant Restraint Controller (ORC)
How to Fix the DTC U1159 RAM?
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 U1159 RAM 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 U1159 RAM Code
1. What does the OBDII code U1159 mean on a RAM vehicle?
U1159 indicates that there is a lost communication issue between the vehicle's main control module and the Automatic Sway Bar System Module.
2. What are the common symptoms of the U1159 code?
Typical symptoms include a warning light on the dashboard, inability to engage or disengage the sway bar, reduced off-road capability, and potential drivability concerns.
3. What causes the U1159 code to appear?
The most common causes include damaged wiring, loose or corroded connectors, a faulty Automatic Sway Bar System Module, or issues with the CAN (Controller Area Network) communication bus.
4. Can I still drive my RAM with the U1159 code active?
While the vehicle can still be driven, off-road performance may be compromised, and ignoring the issue could lead to further damage or additional codes.
5. How do I diagnose the U1159 code?
Start by inspecting the wiring and connectors related to the sway bar system for damage or corrosion. Use a scan tool to check for communication with the sway bar module and test the CAN bus for continuity.
6. What tools are needed to troubleshoot the U1159 code?
You’ll need a diagnostic scan tool capable of reading manufacturer-specific codes, a multimeter, and possibly an oscilloscope for advanced CAN bus testing.
7. How do I fix the U1159 code?
Repairs may include cleaning or replacing corroded connectors, repairing damaged wiring, updating the module’s software, or replacing the Automatic Sway Bar System Module if it’s faulty.
8. How much does it cost to fix the U1159 code?
Repair costs vary depending on the issue, ranging from $50 for minor wiring repairs to $500 or more if the sway bar module needs replacement.
9. Can a software update resolve the U1159 code?
Yes, in some cases, a software update for the sway bar module or related control modules can clear communication issues and resolve the code.
10. How can I prevent the U1159 code from occurring again?
Regularly inspect the sway bar system’s wiring and connectors for damage or corrosion, and ensure the system is not exposed to excessive dirt, moisture, or impacts during off-road use.
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