2005-2006 Honda CR-V ECM: The Critical 'S' VIN and Immobilizer Guide
This guide covers the essential compatibility check for England-built models and the mandatory programming required when replacing your Engine Control Module.
- This ECM only fits 2005-2006 CR-V models built in England, identified by a VIN that starts with the letter 'S'.
- A replacement ECM MUST be programmed to the vehicle's immobilizer system. The engine will not start until this is done.
- Failure is often indicated by a no-start condition, stalling, poor performance, or a check engine light with codes like P1607.
- Water leaks in the passenger footwell are a known cause of ECM failure; check for dampness and corrosion before replacing.
Is This The Right Part For Your CR-V? The 'S' VIN Warning
Compatibility Warning: This Engine Control Module is for 2005-2006 Honda CR-V models built in England ONLY. Before purchasing, you must check the first character of your Vehicle Identification Number (VIN). If your VIN starts with the letter 'S', this part is correct for your vehicle. The 'S' indicates the vehicle was assembled at Honda's plant in the UK. If your VIN starts with 'J' (Japan) or another character, this ECM will not be compatible.
Programming is Required: Your CR-V Will Not Start Without It
Replacing the ECM is not a simple plug-and-play job. The ECM is a core part of your Honda's anti-theft immobilizer system. If you install a different ECM, the immobilizer will prevent the engine from starting, and you will see a flashing green key symbol on your dashboard. You have three main options to get your vehicle running again:
- Dealer or Independent Shop Programming: A Honda dealership or a well-equipped independent repair shop can program the replacement ECM to your vehicle and existing keys using a diagnostic scan tool. 🎬 Watch: How to program the ECM using a scan tool This is often the most straightforward but can be the most expensive option.
- Mail-In Cloning Service: Many online vendors offer a cloning service. You purchase a compatible used ECM and send it along with your original, failed ECM to the company. They will transfer the immobilizer data from your old unit to the replacement unit. When you receive it back, it will be plug-and-play, requiring no extra programming.
- Purchase a Matched Set: Some sellers offer a complete set which includes a used ECM, the matching immobilizer control unit ring (the part around the ignition cylinder), and the original key. If you install all three components, the system will work without programming. However, you will need to have the new key blade cut to match your vehicle's locks.
Symptoms of a Failing 2005-2006 Honda CR-V ECM
ECM failure can cause a wide variety of problems that may seem unrelated. Because the ECM controls so many functions, its failure can mimic other issues.
Common Symptoms:
- Check Engine Light: The most obvious sign is an illuminated Check Engine Light. The ECM may set codes specifically pointing to an internal failure, such as P1607 (ECM/PCM Internal Circuit Failure) or codes in the P0600-P0605 range. It can also set false codes for sensors that are actually working correctly.
- Engine Will Not Start: The engine may crank but refuse to start. This happens when the ECM fails to command the fuel injectors or ignition coils to fire.
- Stalling or Misfiring: The engine may stall unexpectedly while driving or run rough with frequent misfires. This can be due to the ECM failing to deliver the correct fuel mixture and spark timing.
- Poor Performance and Fuel Economy: A sudden, unexplained drop in gas mileage or a noticeable loss of power can be a sign of a struggling ECM.
- Erratic Shifting: The ECM communicates with the transmission control module. Faulty data from the ECM can cause harsh or delayed shifting in automatic transmissions.
A Special Note on Water Damage
The ECM is located behind the glove box in the passenger-side footwell. Water leaks from a clogged A/C drain hose, a bad windshield seal, or a degraded cowl seal can allow water to drip onto the ECM, causing corrosion and electrical shorts. If your passenger-side carpet is damp, you should inspect the ECM and its connectors for any signs of water intrusion or corrosion, as this is a known cause of failure.
🎬 Watch: What water damage looks like inside a failed ECMBuying a Used Engine Control Module
A used OEM ECM is often a reliable and cost-effective alternative to a brand new unit. Since these modules are not high-wear items, a used unit from a reputable source can last the remaining life of the vehicle. Here's what to look for:
- Match Part Numbers: It is critical to match the OEM part number from your original ECM to the replacement unit. The part number is printed clearly on the unit's label. Common part numbers for this application include 37820-PPL-A91 and 37820-PPL-A92.
- Inspect for Damage: Check the casing for any signs of physical damage. Most importantly, inspect the connector pins carefully. They should be straight, clean, and free of any corrosion. Corrosion is a major red flag indicating possible water damage.
- Consider a Warranty: Purchase from a seller that offers a warranty. This protects you in case the part is dead on arrival.
- Plan for Programming: Remember that a used ECM will always require programming. Factor the cost of a locksmith, dealer visit, or mail-in service into your total repair cost.
Cost of Replacing a 2005-2006 CR-V ECM
The cost can vary dramatically based on which replacement option you choose.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $1,300 - $1,950 |
| Remanufactured / Cloned | $250 - $500 |
| Used OEM | $50 - $150 |
| Shop Labor (Installation & Programming) | $150 - $300 |
Frequently Asked Questions (FAQ)
Can I drive my CR-V with a bad ECM?
It is not recommended. Depending on the failure mode, the vehicle may not start at all, stall unexpectedly in traffic, or run so poorly that it causes damage to other components like the catalytic converter. Driving with a faulty ECM is unreliable and potentially unsafe.
Where is the ECM located on a 2005-2006 Honda CR-V?
The ECM is located behind the glove box on the passenger side of the vehicle. You will need to remove the glove box assembly to access it.
🎬 See this video for the exact ECM location and removalDo I need a Honda dealer to program a new ECM?
No, not necessarily. While a Honda dealer can always perform the programming, many independent auto repair shops and automotive locksmiths have advanced scan tools that can program the immobilizer system on these vehicles. Mail-in cloning services are also a popular option that avoids the need for in-person programming.
Will a used ECM from a CR-V with a different VIN work?
Yes, provided it is from an England-built model (VIN starting with 'S') and has the exact same OEM part number. However, it will absolutely need to be reprogrammed to your vehicle's immobilizer system before the engine will start.
Helpful Videos
Technical Specifications
OEM Part Numbers: 37820-PPL-A91 37820-PPL-A92 37820-PPA-A92 37820-PPA-427 37820-PPA-417
Location: Behind the glove box, passenger side.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Honda CR-V:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is This The Right Part For Your CR-V? The 'S' VIN Warning
- Programming is Required: Your CR-V Will Not Start Without It
- Symptoms of a Failing 2005-2006 Honda CR-V ECM
- Common Symptoms:
- A Special Note on Water Damage
- Buying a Used Engine Control Module
- Cost of Replacing a 2005-2006 CR-V ECM
- Frequently Asked Questions (FAQ)
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