C1155 Ford Code - Left Front Wheel Speed Sensor Input Circuit Failure
Quick Answer
The C1155 Ford code indicates a Left Front Wheel Speed Sensor Input Circuit Failure. Common causes include Faulty wheel speed sensor, Damaged sensor wiring or connectors, Corrosion or debris affecting sensor performance. 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
- C1155 Ford indicates Left Front Wheel Speed Sensor Input Circuit Failure.
- Common causes
- Common causes include Faulty wheel speed sensor, Damaged sensor wiring or connectors, Corrosion or debris affecting sensor performance.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code C1155 Ford Description
The C1155 Ford code indicates a Left Front Wheel Speed Sensor Input Circuit Failure. This means that there is an issue with the sensor that monitors the speed of the left front wheel. The wheel speed sensor is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. When the sensor fails, it can lead to inaccurate speed readings, which can affect the operation of these safety systems. If not addressed, this issue can result in compromised braking performance, stability control, and overall handling of the vehicle.
Common Causes of C1155 Ford
- Faulty wheel speed sensor
- Damaged sensor wiring or connectors
- Corrosion or debris affecting sensor performance
- Electronic control unit (ECU) malfunction
- Wheel bearing or hub assembly issues
Symptoms of C1155 Ford
- ABS light illuminated on the dashboard
- Traction control light activated
- Inconsistent or erratic speedometer readings
- Braking system feels less responsive
- Vehicle may experience difficulty maintaining traction on slippery surfaces
How to Fix C1155 Ford
- Begin by diagnosing the specific cause of the circuit failure using a diagnostic scanner
- Inspect the wheel speed sensor, wiring, and connectors for any damage or corrosion
- Replace the faulty speed sensor or repair damaged wiring/connectors
- Clear the diagnostic trouble codes from the ECU
- Test drive the vehicle to ensure the issue has been resolved and that the ABS and traction control systems are functioning properly
Cost to Fix C1155 Ford
The typical repair costs for a Left Front Wheel Speed Sensor Input Circuit Failure can range from $150 to $300, including parts and labor. However, the actual cost can vary based on the specific vehicle make and model, the location of the repair shop, and any additional repairs that may be needed. It's recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your individual circumstances.
Need more information about the C1155 Ford code?
Need more information on how to fix the C1155 Ford code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1155 Ford code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1155 Ford Code
1. What does the OBDII code C1155 mean on a Ford vehicle?
C1155 indicates a failure in the left front wheel speed sensor input circuit, which is part of the ABS (Anti-lock Braking System).
2. What are the common symptoms of the C1155 code on a Ford?
Symptoms include the ABS warning light or traction control light illuminating, possible loss of ABS functionality, and inconsistent braking performance.
3. What causes the C1155 code to appear on a Ford?
The code can be triggered by a faulty left front wheel speed sensor, damaged wiring or connectors, corrosion, or a malfunctioning ABS module.
4. Can I drive my Ford with the C1155 code?
While the vehicle may still be drivable, the ABS system may not function properly, increasing the risk of wheel lockup during hard braking.
5. How do I diagnose the C1155 code on a Ford?
Check the left front wheel speed sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor and inspect the ABS module for faults.
6. How do you fix the C1155 code on a Ford?
Repairs may include replacing the left front wheel speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or addressing ABS module issues.
7. How much does it cost to fix the C1155 code on a Ford?
The cost can vary but typically ranges from $100 to $300 for parts and labor, depending on whether the sensor or wiring needs replacement.
8. Can a bad wheel bearing cause the C1155 code on a Ford?
Yes, a damaged wheel bearing can cause improper wheel speed sensor readings, potentially triggering the C1155 code.
9. Do I need to reset the ABS system after fixing the C1155 code?
Yes, after completing repairs, use an OBDII scanner to clear the code and reset the ABS system to ensure proper functionality.
10. How can I prevent the C1155 code from coming back on my Ford?
Regularly inspect the wheel speed sensors, wiring, and connectors for damage or corrosion, and address any ABS-related issues promptly.
Discuss the causes and fixes for C1155 Ford OBDII Code
-
I have changed the sensor.... And the abs braking light is still on sending the same error what can i do now
-
I haven't had that problem, but I check a national database of repairs for you model year and if the sensor didn't fixed the problem, then the next step is to change the Hub Assembly.
-
Thanks.... .I hope it works. Apart of the hub assembly is there an other sensor or piece to replace ?
-
Nothing else major on the list. Out of 225 repairs reported, 160 was the sensor, 56 the hub, 5 the brake rotor, 3 the wheel bearing. 1 the control arm ball joint.
-
Thanks a lot for your help.... The problem has been solved...
-
HI i have a 2002 F-150 and have the same issue but i have 2 codes the C1155 (left speed senor input ) and C1096 Pump motor open Circuit are they related? and can the second code go on with just 1 ABS being at fault? thanks
-
As far as I know the codes are not related, both codes are for the ABS system, but there is nothing in the factory service manual that shows that the codes are related. I would recommend tackle one code at time and start with the C1155. The code is very common and usually the problem is the Left Front Wheel Speed Sensor.
-
I have the same problem in my 2011 ford flex SEL naturally aspired vehicle, I've changed the sensor and the hub assembly still not fixed
-
I replaced a wheel sensor and reset the code but still getting LF input circuit failure
-
I had 2 codes 1 for LF wheel senso bad and 1 for LF wheel Sensor input circuit failure I replace the sensor and still getting the center input circuit failure don’t know what to do
-
Let me check if I can find more information. What model and year is your vehicle?
-
my 2010 cvpi has the code c1155-20,changes the wheel bearing hub,abs light not on,but my obd2 show the code c1155-20,pedal pulsing and grinding?
-
C1155-20 is still telling you the left front wheel speed signal is not correct, even though you replaced the hub.
The pulsing pedal and grinding you feel is the ABS activating when it shouldn’t — the module thinks that wheel is locking up because it’s getting a bad or inconsistent signal.
A couple important points on these Crown Vic/Police Interceptors:
• The wheel speed sensor is built into the hub, but the signal depends on the tone ring and wiring too
• Not all aftermarket hubs give a clean signal — I’ve seen brand new ones cause this exact issueSince the ABS light is off but the code is still stored and you feel ABS activation, I’d check:
• Wiring from the hub to the ABS module – look for breaks, corrosion, or stretched wires
• Connector at the wheel – make sure pins are tight and clean
• Tone ring condition (if separate on your setup)
• Compare live wheel speed data – see if the left front drops out or reads different from the othersAlso, if the problem started right after replacing the hub, I would seriously suspect:
• A faulty or low-quality hub, or
• Damage to the sensor wiring during the installOne quick test is to swap sides (if possible) or install a known good quality hub and see if the issue goes away.
Bottom line: the ABS system is still seeing a bad signal from that left front wheel, and that’s what’s causing the pedal pulsing. Focus on the signal (hub + wiring), not just the part being new.
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.