The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2016 LaCrosse Stalls While Driving, Reduced Power Mode

0

Mike T. · rep 0 · May 25, 2:43 AM · 1 replies · solved · Question

Vehicle: 2016 Buick LaCrosse Premium

My 2016 Buick LaCrosse Premium (V6 engine, about 90,000 miles) has started to stall intermittently while I'm driving, usually at lower speeds or when coming to a stop. Sometimes, it throws a "Reduced Engine Power" warning on the dash right before it stalls.

It usually starts back up after a minute or two, but it's incredibly unnerving and dangerous, especially in traffic. I haven't seen a specific OBD-II code pop up on my basic scanner after it stalls, but the check engine light does flash briefly during the event.

What could cause such an intermittent stalling issue, especially with the reduced power warning? I'm worried about driving it like this and need to figure out what's going on.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:43 AM

0

ClearTheCode admin answer: Intermittent stalling combined with a 'Reduced Engine Power' warning on your 2016 Buick LaCrosse is a serious issue that requires immediate attention due to safety concerns. The flashing check engine light indicates a current or very recent severe misfire or engine condition.

Here are common causes for these symptoms:

  1. Throttle Body Issues: A dirty or failing electronic throttle body is a very common cause for 'Reduced Engine Power' warnings and stalling. Carbon buildup can restrict airflow, or the internal electronics (throttle position sensor) can fail, leading to inconsistent engine control.

  2. Fuel Delivery Problems:

    • Fuel Pump: A failing fuel pump or clogged fuel filter can cause insufficient fuel pressure, leading to stalling, especially under load or when the engine demands more fuel.
    • Fuel Pressure Sensor: A faulty sensor can send incorrect readings to the engine control module (ECM), leading to improper fuel delivery.

  3. Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP): These sensors are crucial for the ECM to determine engine speed and position. A failing CKP or CMP can cause intermittent stalling or no-start conditions, as the ECM loses vital engine timing information.

  4. Engine Control Module (ECM) / Powertrain Control Module (PCM): While less common, a faulty ECM/PCM itself can cause a wide range of driveability issues, including stalling and reduced power modes, by misinterpreting sensor data or failing to command components correctly.

  5. Ignition System: Faulty ignition coils or spark plugs, especially if multiple cylinders are affected, can lead to severe misfires that trigger reduced power mode and stalling.

When to See a Shop: Because of the safety implications of stalling while driving and the complexity of diagnosing intermittent issues, you should have your LaCrosse professionally inspected as soon as possible. A professional scan tool can retrieve 'history' or 'pending' diagnostic trouble codes (DTCs) that your basic scanner might miss, even if the check engine light isn't currently on. These codes are critical for pinpointing the exact cause of the problem.

Menu

Help & account