Complete Guide to the 2006–2014 Toyota Corolla 1.8 Power Steering Control Module: 991-31204 / 89650-12340 / 112900-1037
Welcome to Automan Spare Parts—Africa's number one supplier of high-quality OEM Steering Control Modules and other genuine automotive components. We pride ourselves on offering a huge range of parts at the cheapest rates with fast shipping globally. This guide focuses on a critical component for your Toyota Corolla: the Electric Power Steering Control Module (EPS ECU).
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Understanding the Corolla EPS Control Module
Your 2006–2014 Toyota Corolla 1.8L uses an Electric Power Steering (EPS) system, which relies on a sophisticated Electronic Control Unit (ECU) to manage the steering assist. This module, often referenced by part numbers like 89650-12340, 991-31204, or 112900-1037, reads inputs from the steering angle and torque sensors to determine the exact amount of electric motor assistance needed. A failing module can turn a light steering wheel into a heavy, difficult one, making replacement a necessity.
Top Symptoms of a Failing EPS Control Module
If you own a 2006–2014 Toyota Corolla, watch out for these tell-tale signs that your Power Steering Control Module may be failing, requiring an urgent replacement:
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Stiff Steering/Loss of Assist: The most common and dangerous symptom. The steering wheel suddenly becomes very heavy and hard to turn, especially at low speeds.
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Illuminated EPS Warning Light: A dashboard warning light, usually shaped like a steering wheel with an exclamation mark (!), indicates a fault in the system.
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Intermittent Steering Loss: The power assist works sometimes but cuts out randomly.
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Unusual Noises: Clicking, grinding, or whining sounds coming from the steering column area.
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Diagnostic Trouble Codes (DTCs): A scan tool will often reveal specific codes like C15xx related to ECU or sensor malfunction.
Compatibility Table: 2006–2014 Toyota Corolla 1.8L EPS Module
Identifying the correct module for your specific vehicle is crucial. While part numbers can supersede or vary slightly by market, the following table covers the common references for this generation of the Corolla. Always verify the part number on your existing unit before purchasing.
| Component Name | Primary OEM Part Number | Alternate/Manufacturer Part Numbers | Toyota Corolla Model Years | Engine Spec |
| Power Steering Control Module (EPS ECU) | 89650-12340 | 991-31204, 112900-1037, 89650-02740 (Superseded/Variant) | 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 | 1.8L |
| Relevant Chassis Code (Example) | N/A | ZRE152/ZRE153 (Common chassis for 1.8L) | N/A | N/A |
Note: The primary application is for the 10th generation (E140/E150) Corolla models.
Crucial Replacement Information: Does it Need Programming?
A common question is whether a new Power Steering Control Module requires programming, flashing, or a reset procedure.
Yes, Programming is Typically Required.
While some electronic modules are plug-and-play, the Toyota EPS ECU often needs specialized calibration to function correctly with your vehicle's systems.
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Steering Angle Sensor Centering: This is a crucial step to ensure the module knows the "straight ahead" position of the wheels.
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Software Endstop Learning: This calibrates the module to the maximum travel limits of the steering rack.
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DTC Clearing: Any stored fault codes must be cleared after installation.
Warning: Failure to perform these steps using an appropriate diagnostic scan tool can result in continued steering issues, erratic assist, or the EPS warning light remaining on. We recommend having the replacement and programming done by a qualified technician.
FAQ - Frequently Asked Questions
Q: How long does a Toyota Corolla Power Steering Control Module last?
A: They are designed to last the life of the vehicle, but electrical spikes, moisture, or continuous heat exposure can cause premature failure. Most issues appear after 8–12 years of service.
Q: Can I drive with a failed EPS module?
A: Yes, but it is highly discouraged. While the steering column is still mechanically linked, the steering will be extremely difficult and heavy (manual-level effort), which is a significant safety hazard, especially in emergencies.
Q: Why are there so many part numbers for the same module (e.g., 991-31204, 89650-12340, 112900-1037)?
A: This is common in the automotive industry. 89650-12340 is the main Toyota OEM part number (Computer Assembly, Power Steering). The other numbers (like 991-31204 and 112900-1037) are typically the manufacturer/supplier reference codes (e.g., JTEKT, Denso) stamped on the physical unit.
Q: Why choose Automan Spare Parts for my Steering Control Module?
A: We specialize in OEM quality parts for Toyota and other brands, offering the most competitive pricing and fastest shipping globally to ensure minimal downtime for your vehicle. Our commitment to being the No. 1 in Africa means you get verified quality and reliability.
TLDR (Too Long; Didn't Read)
The 2006–2014 Toyota Corolla 1.8L Power Steering Control Module (P/Ns including 89650-12340) is a critical component for your electric power steering. Failure is indicated by stiff steering and the EPS warning light. Yes, the replacement module requires professional programming and calibration (Steering Angle Sensor Centering) to function correctly. Find genuine OEM modules at the cheapest rates with fast global shipping at Automan Spare Parts.
Excerpt
Keep your 2006–2014 Toyota Corolla's steering smooth and safe. This complete guide details the symptoms, part numbers (991-31204, 89650-12340, 112900-1037), and crucial replacement steps for the 1.8L Power Steering Control Module, including the necessity of professional programming. Get your genuine OEM replacement from Automan Spare Parts—Africa's number one choice for quality, value, and fast global delivery.
