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2022 Escalade - 'Service StabiliTrak' & Reduced Engine Power

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David L. · rep 0 · May 22, 3:56 AM · 1 replies · solved · Question

Vehicle: 2022 Cadillac Escalade ESV Premium Luxury 6.2L

Hello everyone,

I'm experiencing a frustrating issue with my 2022 Cadillac Escalade ESV, 6.2L. While driving, I suddenly got a 'Service StabiliTrak' message on the dash, followed by 'Reduced Engine Power'. The vehicle immediately lost significant power, making it difficult to accelerate.

I pulled over and scanned for codes. I found C0561 (System Disabled - Information Stored) and P2138 (Accelerator Pedal Position Sensor 1-2 Correlation).

Has anyone else encountered this combination of messages and codes on their newer Escalade? Is this typically a sensor problem, or could it be something more involved? Any advice on where to start looking?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:56 AM

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ClearTheCode admin answer:

The 'Service StabiliTrak' message combined with 'Reduced Engine Power' and codes C0561 and P2138 on your 2022 Cadillac Escalade points directly to an issue with the electronic throttle control system, specifically the Accelerator Pedal Position (APP) sensor.

  1. Understanding the Codes:

    • P2138 (Accelerator Pedal Position Sensor 1-2 Correlation): This is the primary code. It indicates that the two internal sensors within the accelerator pedal assembly are providing signals that do not correlate with each other. The Powertrain Control Module (PCM) uses two redundant sensors for safety to ensure accurate throttle input. When they don't match, the PCM assumes a fault and enters 'Reduced Engine Power' mode to prevent unintended acceleration.
    • C0561 (System Disabled - Information Stored): This is a generic StabiliTrak system code that often appears as a secondary fault when the engine control system (which StabiliTrak relies on) goes into a reduced power mode. It's a symptom, not the root cause.

  2. Initial Diagnostic Steps:

    • Inspect Wiring and Connector: Check the electrical connector and wiring harness leading to the accelerator pedal assembly. Look for any signs of damage, corrosion, or loose connections. Sometimes, simply unplugging and re-plugging the connector can temporarily resolve a poor connection.
    • Clear Codes and Test: After inspecting, clear the codes and see if the issue immediately returns. If it does, the problem is likely persistent.

  3. When to See a Shop:

    • The P2138 code very strongly suggests a faulty Accelerator Pedal Position (APP) sensor assembly. While it's a relatively straightforward replacement for a DIYer, ensuring you get the correct OEM part is crucial for proper function.
    • If after replacing the APP sensor the issue persists, or if you're uncomfortable performing the replacement, a dealership or qualified independent shop should diagnose it. They can verify the sensor's live data signals and rule out any underlying PCM issues, though this is less common with a direct P2138 code.
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