Chrysler Cirrus U11FB Engine Trouble Code
What is Chrysler Cirrus U11FB?
Chrysler Cirrus U11FB code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
U11FB on the Chrysler Cirrus
Transmission-mounted speed sensors on the Chrysler Cirrus share a ground path with the engine control module. A corroded ground point on the transmission bell housing generates electrical noise that the ECU misinterprets as a U11FB fault condition.
Code Information
| Code Type: | OBD-II Network (U) Trouble Code |
| System: | Network |
| Vehicle: | Chrysler Cirrus |
| Brand: | Chrysler |
| Model: | Cirrus |
| Code: | U11FB |
U11FB Chrysler Cirrus Symptoms
Check Engine Light
Illuminated Chrysler Cirrus dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Chrysler Cirrus
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Chrysler Cirrus
Increased Emissions
Failed emissions test due to U11FB
U11FB Code Structure
Understanding what each digit means in the U11FB network trouble code:
| U | 1 | 1 | f | b |
|---|---|---|---|---|
| Network Code | Fuel And Air Metering | Fuel Rail/System Pressure — Too High | Engine Oil Over Temperature Condition | System Malfunction |
How to Fix Chrysler Cirrus U11FB
Diagnostic Steps:
Regarding U11FB, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
U11FB DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
Chrysler Cirrus U11FB Repair Cost
For Chrysler Cirrus owners, budget the following for a U11FB repair: EGR valve cleaning $80–$120 or replacement $250–$450, intake manifold gasket $120–$200, and a post-repair reset and road test. Total: $350–$650 at an independent garage.
U11FB Description
U11FB engine trouble code is related to System Malfunction.
Main Cause
The primary reason for U11FB OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.
Common U11FB Misdiagnosis on the Chrysler Cirrus
A catalytic converter is often condemned on the Chrysler Cirrus when U11FB appears and an efficiency code is present. Before replacement, verify that the upstream oxygen sensor is not slow-responding — a lazy O2 sensor mimics catalytic inefficiency perfectly.
DIY Repair Guide: U11FB on Chrysler Cirrus
The coolant temperature sensor on the Chrysler Cirrus is a straightforward DIY item (difficulty 2/5). Have a drain tray ready for the small amount of coolant that spills when the sensor is removed. Top up the cooling system afterwards and check for air pockets.
Preventing U11FB on the Chrysler Cirrus
For diesel Chrysler Cirrus owners, a DPF (Diesel Particulate Filter) regeneration run on the motorway every 500 miles prevents soot blockage that back-pressures the exhaust and forces U11FB flags via the pressure differential sensors.
Frequently Asked Questions — Chrysler Cirrus U11FB
A: Temporarily clearing U11FB can help determine whether it is intermittent or persistent, but it does not fix the underlying fault. The code will return if the problem is still present. Do not clear codes just before an emissions test without a proper drive cycle.