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2017 RLX Sport Hybrid - 'Check SH-AWD System' Warning Light & Reduced Power

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Mike T. · rep 0 · May 26, 3:57 AM · 1 replies · solved · Question

Vehicle: 2017 Acura RLX Sport Hybrid Advance

Hey everyone,

I've run into a concerning issue with my 2017 Acura RLX Sport Hybrid Advance. Recently, the 'Check SH-AWD System' warning light came on, and I've noticed a significant reduction in power, especially when accelerating from a stop or going uphill. It feels like the electric motors aren't engaging properly.

The car has about 75,000 miles on it, and I've kept up with all the scheduled maintenance. I tried restarting the car a few times, but the warning light persists. Has anyone else experienced this with their Sport Hybrid RLX?

I'm worried this might be a costly repair involving the hybrid battery or the SH-AWD system itself. Any advice or shared experiences would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:57 AM

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ClearTheCode admin answer:

It sounds like your 2017 Acura RLX Sport Hybrid Advance is experiencing a common issue related to the complex hybrid drivetrain. The 'Check SH-AWD System' warning often indicates a fault within the hybrid system, which directly impacts the SH-AWD functionality and overall power delivery.

Common Causes & Diagnostics:

  1. Hybrid Battery Degradation/Fault: As hybrid batteries age, their capacity can diminish, leading to performance issues and warning lights. Diagnostic trouble codes (DTCs) like P0A7A (Drive Motor 'A' Inverter Performance) or P0A7F (Hybrid Battery Pack Over-Temperature) are often associated with battery-related problems.
  2. Motor-Generator Unit (MGU) Issues: The electric motors themselves, or their control units, can develop faults. This can cause reduced power and system warnings.
  3. Inverter/Converter Problems: These components manage the flow of power between the battery and the motors. A malfunction here can trigger system warnings.
  4. Software Glitch: Less common, but sometimes a software update or reset can resolve intermittent issues.

What to Do:

  1. Check for OBD-II Codes: The first step is to get the vehicle scanned for specific diagnostic trouble codes. A standard OBD-II scanner might show generic powertrain codes, but an Acura-specific scanner (like those at a dealership) will provide more detailed codes related to the hybrid system.
  2. Note Symptoms: Keep a detailed log of when the warning appears, what driving conditions precede it, and any other symptoms you notice (e.g., unusual noises, changes in braking).
  3. Schedule Dealer Service: Given the complexity of the Sport Hybrid system and the potential for costly repairs, it's highly recommended to take your RLX to an authorized Acura dealership as soon as possible. They have the specialized diagnostic tools and training to accurately pinpoint the issue. Attempting DIY repairs on a high-voltage hybrid system without proper training and equipment can be dangerous.

Ignoring this warning can potentially lead to further damage or leave you stranded. Address it promptly.

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