20 Most Recent 2009 GMC Envoy - Page 2 Questions & Answers


It should reset by itself after you resolve the low pressure problem and drive it a bit. The sensor will usually reset within 24 hours if the vehicle is driven a couple of times. If it does not reset, the sensor could be damaged or defective.
BillB

2009 GMC Envoy | Answered on Feb 12, 2010


There are two O2 sensors, one on the exhaust manifold on the right side (passenger side) of the engine, and one just after the catalytic converter.

GMC Envoy Cars &... | Answered on Jul 24, 2019


Your drive train may be in limp mode, which indicates something seriously wrong with it (engine or transmission). Check for trouble codes with a code reader.

GMC Envoy Cars &... | Answered on May 26, 2019


Google your question.
About 280,000 results (0.61 seconds)

https://www.autozone.com/repairguides/S-T-Series-Blazer-Bravada-Envoy-Jimmy-Rainier-Trailblazer-Xtreme/Component-Locations/Secondary-Air-Injection-AIR-Pump-Relays/_/P-0996b43f80cb36eb

GMC Envoy Cars &... | Answered on Apr 30, 2019


Look for black wire. Check it by using an omh meter and testing it to a ground.

GMC Envoy Cars &... | Answered on Mar 29, 2019


located in the back . It's called the LGM fuse #2 (Lift Gate Module) The Lift Gate Module controls the defroster grid circuit.

GMC Envoy Cars &... | Answered on Feb 21, 2019


Check that brake switch has not become displaced or somehow loose. Its likely the switch is failing and needs replaced.

GMC Envoy Cars &... | Answered on Jan 29, 2019


I'm pretty sure that there is a video on you tube on how to reset GM speedometers. Give it a shot.

GMC Envoy Cars &... | Answered on Jan 15, 2019


threw a po128 ??? Doesn't throw code's ,it stores code's . P0128 code does not tell you to replace the sensor either . With every code comes a diagnostic test procedure listed in a factory info. manual .
DTC P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature
The purpose of this diagnostic is to analyze the performance of the thermostat, by using the ECT sensor to determine if the engine coolant will increase at the correct rate, and also meet the calibrated target temperatures under various operating conditions. The ECM uses the start-up ECT and the start-up intake air temperature (IAT) to begin the diagnostic calculation. The air flow into the engine is accumulated, and vehicle speed, distance, and engine run time are also factored in to determine if the ECT does increase normally and reach the calibrated target temperatures.
Diagnostic Aids
?€¢
DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.


?€¢
Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.


?€¢
A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.


Circuit/System Verification

  1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to Cooling System Leak Testing and Cooling System Draining and Filling .
  2. Ignition OFF for 8 hours or greater.
  3. Ignition ON, observe the scan tool ECT Sensor and IAT Sensor parameters. The ECT, IAT and ambient temperatures should be within 15?°C (27?°F) of each other.
  4. Important: A critical analysis of the operation of the thermostat is necessary to properly diagnose this DTC.
  5. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis .
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal B and ground.
  3. ?‡'
    If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

  4. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39?°C (-38?°F).
  5. ?‡'
    If warmer than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.

  6. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool ECT Sensor parameter is warmer than 149?°C (300?°F).
  7. ?‡'
    If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

  8. If the circuits test normal, test or replace the ECT sensor.

GMC Envoy Cars &... | Answered on Nov 20, 2018


If the alignment keeps drifting out there is an issue with the suspension. Have the suspension bushes, ball joints and wheel bearings checked. If any of these are worn it can throw out your alignment.
Are you getting any other issues? Things like vague steering, grumbling noises as you accelerate, vibration through the pedals or steering wheel, 'clonks' when hitting potholes? These are all clues to what the issue is.

GMC Envoy Cars &... | Answered on Sep 28, 2018

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