Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer that helps with steering is having trouble remembering important information.
The EEPROM (Electrically Erasable Programmable Read-Only Memory) in the Power Steering Control Module is not functioning correctly, which can affect the steering system.
The C1121 code indicates a fault in the EEPROM of the Power Steering Control Module. This memory is crucial for storing data that the module uses to control the power steering system. A failure here can lead to improper steering assistance.
• Steering wheel feels heavy or difficult to turn
• Power steering warning light on the dashboard
• Intermittent loss of power steering assistance
• Corrupted EEPROM data
• Faulty Power Steering Control Module
• Electrical issues such as poor connections or damaged wiring
EEPROM: Electrically Erasable Programmable Read-Only Memory
OBD-II: On-Board Diagnostics, second generation
• Check for other related codes and address them first.
• Inspect wiring and connectors to the Power Steering Control Module.
• Test the Power Steering Control Module for proper functionality.
• Reprogram or replace the Power Steering Control Module.
• Repair or replace damaged wiring or connectors.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Diagnostic software for module reprogramming
$300 - $800
Moderate
• Ford Focus
• Nissan Altima
• Chevrolet Malibu
• Regularly check and maintain the vehicle's electrical systems.
• Avoid exposing the vehicle's electronics to excessive moisture.
• Ensure all software updates are applied promptly.
Control Module Issue
• If the steering feels heavy, avoid driving at high speeds.
• Get the vehicle checked by a professional mechanic as soon as possible.
Check if the vehicle's power steering system is covered under warranty, especially if the vehicle is relatively new.
This code has been reported in various models, often related to electrical issues within the steering control system.
High – Steering issues can affect vehicle control and safety.
Driving with impaired steering can lead to accidents. Address this issue promptly to ensure vehicle safety.
• Vehicle at operating temperature
• Steering system engaged
The Power Steering Control Module is typically located near the steering column or within the engine compartment.
Q: Can I drive with a C1121 code?
A: It's not recommended to drive with this code as it can affect steering performance and safety.
Q: How do I reset the C1121 code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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