2006 GMC Envoy Denali - Page 4 - Answered Questions & Fixed issues


have the system trouble code tested, it is most likely a fuel level sensor in the gas tank is defective, any Kragen or Autozone will do this test for free,(except Caif)

2006 GMC Envoy... | Answered on Dec 12, 2009 | 323 views


yes repace plug wire and recheck still has mis replace coil pack.I hope this helps you?

2006 GMC Envoy... | Answered on Oct 03, 2009 | 598 views


Advice only: DO NOT DRIVE have towed to transmission shop. Had jeep do this once...don't risk it?

2006 GMC Envoy... | Answered on Apr 17, 2009 | 986 views


i would not suggest driving it u can start by replacing the selector switch as this is the cheapest thing to replace my switch was bad and made mine stay in four low please rate my advice

2006 GMC Envoy... | Answered on Dec 21, 2008 | 225 views


try changing out the PCM. its responsible for transmission operation. bad PCM means dumb transmission.

GMC Envoy Cars &... | Answered on Jun 20, 2020 | 147 views


Firing order is 1, 5, 3, 6, 2, 4. Number 1 cylinder is up front. Why would you need the firing order, this engine does not have plug wires, each plug has its own coil pack, each coil pack is controlled by the computer.

GMC Envoy Cars &... | Answered on May 25, 2020 | 497 views


I did the procedure vehicle still didn't start.I did notice the security light did no blink but stayed solid before it when out.Im lost ..

GMC Envoy Cars &... | Answered on Dec 29, 2019 | 4,493 views


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 | 25 views


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 | 166 views


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 | 43 views


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 | 89 views


you may need to use a hammer puller

GMC Envoy Cars &... | Answered on Jan 17, 2019 | 33 views


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 | 392 views

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