B1446 on 2011-2017 Chevrolet Camaro: OnStar Backup Battery Failure Guide

What's Unique About the 2011-2017 Chevrolet CAMARO

OnStar is a signature feature of General Motors vehicles, and this code is directly tied to its hardware. Unlike generic codes, B1446 points specifically to the failure of a non-rechargeable, internal power source within this system. For the 5th (Zeta platform) and 6th generation (Alpha platform) Camaro, this is a common issue as the backup batteries, which have a finite lifespan, begin to fail with age. The repair is unique in that it involves a specific module whose replacement is straightforward but requires careful handling to avoid damaging other components. The location differs slightly between generations: it's behind the glove box on the 5th Gen and under the passenger dash near the firewall on the 6th Gen.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: This issue affects both the 5th Generation (2011-2015) and the early 6th Generation (2016-2017) Camaro. The cause and fix are consistent across these years. The primary difference is the location of the module; it is generally behind the glove box in the 5th Gen and under the passenger side dash panel for the 6th Gen. The TSB PIC4541F specifically covers models up to 2017, confirming its relevance to both generations. Part numbers may also vary by model year, so confirming with a VIN is recommended.

Symptoms You May Notice

• Solid or flashing red OnStar status light on the rearview mirror or overhead console.
• "Service OnStar" message on the Driver Information Center (DIC).
• Inability to use OnStar services or receive diagnostic reports via email.
• GPS and compass functions on the infotainment screen may be affected.

Most Likely Causes

1. Aged/Failed OnStar Backup Battery 🔴 High Probability → Shop Vehicle Battery The backup battery is a non-rechargeable lithium power cell with a limited service life, typically 5-7 years. As these vehicles age, natural battery degradation is the most common reason for failure. The battery is designed to be used only once in an emergency and cannot be recharged.
   How to confirm: Confirm the presence of code B1446 with an OBD-II scanner that can read B-codes (Body codes). The solid red OnStar LED is also a very strong and common indicator reported by owners. A dealer-level scan tool may show a symptom code of '03' for voltage below threshold.
   Typical fix: Replace the OnStar backup battery module. This is a distinct part from the main OnStar (VCIM) module.
   Est. part cost: $50-$100

Rare But Worth Checking

• Faulty OnStar Module (VCIM): → Shop Telematics Interface Module If replacing the backup battery does not clear the code, the main Vehicle Communication Interface Module (VCIM) may have an internal fault preventing it from correctly reading the battery's voltage. This is much less common.
• Wiring Harness Damage: Damage to the wiring or connectors between the backup battery and the VCIM could cause a loss of connection, triggering the code. This is unlikely without prior interior work or damage.
• Improper Service Procedure: Disconnecting the main vehicle battery or OnStar fuse while the ignition or Retained Accessory Power (RAP) is active will trigger the backup battery, permanently draining it. This can happen during unrelated repairs if the technician is not aware of the procedure outlined in TSB PIC4541F.

Diagnosis Steps

1. Verify the symptom: Check for a solid or flashing red light on the OnStar buttons.
2. Scan for codes using an OBD-II scanner capable of reading Body (B) codes to confirm B1446 is present. Note if a symptom code like '03' is displayed.
3. CRITICAL: Turn the ignition completely OFF. Open and close the driver's door to ensure Retained Accessory Power (RAP) is deactivated. Wait a few minutes for all modules to power down before proceeding.
4. Locate the OnStar backup battery module. In the 5th Gen Camaro (2011-2015), remove the glove box by disconnecting the side elastic string and squeezing the sides to release it. The battery module is located behind it. For the 6th Gen Camaro (2016-2017), it is typically found under the passenger side dash near the firewall, requiring removal of the lower dash panel.
5. For advanced diagnosis: Disconnect the harness connector at the module. Using a multimeter, test the voltage between the supply voltage circuit (typically terminal 14) and the low reference circuit (typically terminal 13). A healthy battery should read between 12.3-12.9 volts. If the voltage is below the minimum threshold (approx. 9.5V), the battery has failed.
6. Visually inspect the wiring and connector to the backup battery module for any signs of damage or corrosion.
7. Carefully disconnect the wiring harness from the old battery module. There is a small tab that needs to be depressed.
8. Replace the OnStar backup battery module with a new one (e.g., Part #23117460 or a superseding number).
9. Reconnect the new module, reassemble the trim panels, and start the vehicle. The red OnStar light should turn green after a few moments. No reprogramming is typically needed.
10. Clear the DTCs with the scan tool. The code should not return. A history code may clear on its own after 50 malfunction-free ignition cycles.

Parts You'll Likely Need

• OnStar Backup Battery Module (OEM #23117460) — This is the direct cause of the B1446 code. It is a non-rechargeable battery that fails due to age.
  Trusted brands: ACDelco, GM Genuine Parts
  OEM price range: $60-$100
  Aftermarket price range: $50-$80

Related Codes That Often Appear With This One

• B1447 — B1447 (often with symptom code 04) indicates an open circuit to the backup battery. It often appears alongside B1446 and points to the same root cause: a failed or disconnected backup battery module.

Technical Service Bulletins (TSBs) & Recalls

• PIC4541F: Provides a diagnostic tip for OnStar back-up battery failure causing DTC B1446 or B1447 and a red OnStar LED. It warns technicians not to disconnect power to the module while the ignition or RAP is active, as this will permanently discharge the non-rechargeable battery.

Platform-Specific Known Issues

• Per TSB PIC4541F, disconnecting the main vehicle battery or the OnStar fuse while the ignition is ON or Retained Accessory Power (RAP) is active can trigger the backup battery. This action is irreversible and will permanently drain the backup battery, requiring its replacement even if it was previously good.
• Owner experiences on forums confirm the DIY nature of this repair, with many successfully replacing the part at home. The most difficult part reported is often reaching and unplugging the connector in a tight space.

Mechanic-Grade Diagnostic Values

• OnStar Backup Battery Voltage — expected: 12.3-12.9 Volts. Failure: A reading below approximately 9.5 Volts indicates a failed battery that must be replaced.

Hidden / Shadow Codes Worth Checking

• B1446 03: This is a more specific version of the code, indicating 'Backup Power Source Voltage Below Threshold'. It confirms the issue is low voltage from the battery pack itself. (see via Typically requires a dealer-level scan tool like the GM GDS2 or a high-end professional scanner that can read manufacturer-specific symptom bytes.)
• B1447 04: This related code indicates 'Backup Power Source Open Circuit'. It is often set along with B1446 and points to the same failure of the battery module or its connector. (see via Dealer-level scan tool (GDS2) or high-end professional scanner.)

Wiring & Ground Locations

• VCIM Connector (C1/X1) — The main connector on the Vehicle Communication Interface Module (OnStar Module), located behind the glovebox (Gen 5) or under the passenger dash (Gen 6).. Pin 14 is the battery supply voltage circuit and Pin 13 is the low reference circuit. These pins are used to test the voltage directly from the backup battery before it enters the module.
• G201 / G204 — Located in the left (G201) and right (G204) kick panel areas.. These are major interior ground points. While not directly for the VCIM, a poor ground here could cause intermittent electrical issues in related systems if a new battery does not solve the problem.
• G202 / G203 — Located under the center console.. These grounds serve components in the center stack and console area. A fault here could potentially affect the BCM or other modules that interact with the OnStar system.

Real Owner Repair Stories

• Chevrolet Forum user (Chevrolet Impala (similar OnStar system)) — Dead OnStar backup battery.
  ❌ Tried (didn't work) User was initially unsure of the procedure or part location.
  ✅ What actually fixed it Following advice from a tech sheet, the user located the OnStar unit, purchased the correct backup battery module, and replaced it in 10 minutes, which resolved the issue.
• Car Talk Community user (2007 Chevrolet Impala, 48k miles) — Red light on the OnStar mirror after 7 years of being green.
  ❌ Tried (didn't work) The user was concerned about the connection to a prior main battery replacement.
  ✅ What actually fixed it An OnStar remote diagnostic confirmed the backup battery had failed. The user scheduled a dealer appointment for replacement, where the fix was to replace the specific OnStar backup battery module located in the trunk area of that vehicle.

OEM Part Supersession History

• 19118855, 22704633, 42454411 → 88861186 — Standard part consolidation and updates by the manufacturer.
  Heads up: Part number 88861186 is a common replacement for many GM vehicles, but may not be correct for all Camaros in the 2011-2017 range.
• 22739970 → 23117460 — Part update for specific model years.
  Heads up: Part number 23117460 is commonly cited for the 5th Gen Camaro (2011-2015). Always verify the correct part number for your specific vehicle's VIN, as multiple designs were used.

Model Year Variations Within This Range

• 2011-2015 (5th Gen) vs 2016-2017 (6th Gen): The physical location of the backup battery module is the primary difference. For 5th Gen, it is behind the glove box. For 6th Gen, it is under the passenger-side dash near the firewall. Different OEM part numbers may also apply, making VIN verification critical when ordering.