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B0085 Diagnostic Issue - 2006 Chevy Impala 3.9L with SRS Light On

Model: Chevy Impala Fault Code: B0085 Posted: 2014-08-08 02:31

I recently discovered two diagnostic codes on my 2006 Chevrolet Impala 3.9L: one showing SRS history and current status at the start of each session, followed by a B0085 code — Second Row Right Seat Belt Load Limiter Deployment Control (Subfault). The SRS warning light has appeared suddenly with no prior accidents or crashes. I've been researching this issue and am seeking input from other owners. Since I'm mechanically experienced—over 20 years in personal vehicle maintenance and seven years working on semi-trucks and trailer wiring—I’m confident in troubleshooting, but I’m not sure if this is a sensor failure or something more complex like wiring issues. The code was pulled using an Innova 3160 scanner, which has full SRS and ABS diagnostics with up-to-date firmware. My understanding from the manufacturer’s guidelines indicates that SRS repairs are not recommended for DIYers due to safety risks, but I’m trying to avoid dealer costs if possible. I’ve already inspected the impact sensor connectors at the door junctions and suspect possible corrosion or pinched wiring. However, when I replaced the front left-side impact sensor (same part number as right side) with a used unit from a salvage yard ($35, 199-day warranty), the B0085 code returned after reconnection. A key test: I swapped the front left and right sensors while disconnecting power during installation. After reconnecting, codes B0084 and B0083 appeared but disappeared once both sensors were properly installed—suggesting a wiring or grounding issue rather than a faulty sensor. I’ve also noticed that my Innova scanner incorrectly displays seat belt pretensioner-related codes (B0085, B0084, B0083) when it should only show the actual subfault. This may be a limitation of the tool. Reprogramming is not required unless the SDM module under the passenger seat is replaced—per Mitchell1 DIY guidance. I’m now leaning toward a wiring fault or connector issue and am considering taking the car back to the dealer for a proper diagnosis, though I feel they gave an incorrect assessment (charged $74.96 for diagnostics but claimed the sensor was faulty). Anyone have experience with B0085 on 2006 Impala models? Are there specific wiring diagrams or troubleshooting procedures available for this subfault? Also, which online repair database offers the most accurate OEM-specific data (diagrams, fault trees, step-by-step guides) — AlldataDIY, Mitchell Online, or Chilton’s? Any recommendations for high-quality DIY diagnostic tools that can access subfaults and simulate internal switch operations like a Tech 2 scanner would be greatly appreciated.

Related fault codes
B0085
Comments (6)
Anonymous 2014-08-09 14:27

I found the B0085 code description in official GM service manuals — it refers to the side impact sensor (SIS) located in the door panel. However, some sources list it as a circuit issue involving the load limiter control for seat belts. SRS repairs are complex and involve high-voltage components; I strongly recommend consulting an authorized Chevrolet dealer before attempting any work.

Anonymous 2014-08-18 05:06

I’ve used my Innova 3160 scanner with full vehicle diagnostics and confirmed it pulls accurate SRS codes. I have extensive hands-on experience in automotive electrical systems, including truck wiring and vehicle harnesses. I’m comfortable following technical data sheets and performing safe disconnections as per OEM procedures. I’m not looking to DIY blindly — I want a clear diagnosis before replacing parts or modifying components.

Anonymous 2014-08-18 15:53

Start by inspecting the connector for the second-row right side impact sensor. Look for corrosion, loose pins, or pinched wiring where the door frame meets the chassis. This is a common failure point in older Impala models with SRS systems.

Anonymous 2015-04-18 06:15

Thanks for the tip — I’ve already checked the connector and found no visible damage. But I’m still unsure if there’s a wiring path issue or a grounding problem. Do you know of any specific OEM wiring diagrams or diagnostic procedures for B0085 on 2006 Impala 3.9L models? Also, which online service database provides the most reliable OEM-specific troubleshooting steps — AlldataDIY, Mitchell Online, or Chilton’s?

Anonymous 2015-04-18 06:44

Alldata is a solid choice for OEM diagrams and fault trees. However, it may be more expensive than Identifix, which offers a free trial — worth checking out if you're looking for cost-effective access to detailed repair data.

Anonymous 2016-02-29 06:57

I took the car to the dealer who diagnosed a faulty left front impact sensor near the driver’s side headlight. They said wiring was fine and charged $185 for part replacement — I found an identical used sensor at a salvage yard for $35 with 199-day warranty. After disconnecting both battery terminals for 10 minutes, I replaced the sensor. After reconnection, the B0085 code returned immediately. I then swapped front left and right sensors in my friend’s garage (with power off during swap). After reconnecting, codes B0084 and B0083 appeared but vanished once both sensors were properly installed — indicating a wiring or grounding issue rather than sensor failure. The part numbers for both front sensors are identical. The replacement sensor I used matches the OEM part number. I’ve also noticed that my Innova scanner incorrectly shows pretensioner-related codes (B0085, B0084, B0083) when it should only report the actual subfault — this seems like a software limitation. Reprogramming is not needed unless the SDM module under the passenger seat is replaced. I’m now convinced it’s a wiring or connector issue and will return to the dealer for further diagnosis. They charged $74.96 for diagnostics but failed to resolve the problem after part replacement — I believe they gave an incorrect diagnosis. Any insights on B0085 in 2006 Impala models? Are there known wiring harness issues or specific diagnostic steps available online that match OEM procedures?