20 Most Recent 2002 Pontiac Grand Am GT1 Questions & Answers

CHECK FOR SHORT'S IN THE CIRCUIT! CHECK "AMP" AT THE FUEL PUMP,MAYBE YOUR FUEL PUMP ITS GETTING WEEK!!! CHEK ALSO FUEL PRESSURE BEFORE /AFTER FULE FILTER!

code P0128 may mean that one or more of the following has happened: Low engine coolant level, Leaking or stuck open thermostat, Faulty cooling fan (running too much) but its probably the thermostat

DTC U1000 and U1255 Class 2 Communication Malfunction , Do you know what class 2 serial data communication network is ? What module set this code an what kind of scan tool did you use to read this code . Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for State of Health monitoring, Node Alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an ID number with at least one critical parameter within about 5.5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an ID number associated with it, the DTC will only be reported once. The table below list the modules on the Class 2 Serial Data Circuit that will set a U1000 or U1255 and should be actively communicating the previously described messages on the Class 2 Serial Data Circuit.

Control Module

ID Number Body Control Module (BCM) 064 Electronic Brake Control Module (EBCM) 040 Instrument Panel Cluster (IPC) 096 Radio 128 Powertrain Control Module (PCM) 016 Sensing and Diagnostic Module (SDM) 088 Diagnostic Aids When a malfunction such as a open fuse to a module occurs while modules are communicating, a Loss of Communication DTC is set as current. When the modules stop communicating, ignition is turned off, the current Loss Communication DTC is cleared but the history DTC remains. When the modules begin to communicate again, the ignition is turned on, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set. Test Description The numbers below refer to the step numbers on the diagnostic table.

1. A DTC U1001 - U1254 Lost Communications with with a history status may indicate the cause of U1000 or U1255.
2. The modules not communicating are the likely cause of U1000 or U1255. The modules that are available on the class 2 serial data circuit are listed in the Circuit Description.
3. The module which was not communicating due to a poor connection to the class 2 serial data circuit may have set DTC U1001 - U1254 Lost Communications with for those modules that it was monitoring.
4. The modules which can communicate indicate the module which cannot communicate. You must clear the serial data communication DTCs from these modules to avoid future misdiagnosis.
5. If all modules are communicating, the module which set U1000 or U1255 may have done so due to some other condition.
6. The module which set U1000 or U1255 is the likely cause of the malfunction.

1

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Record the DTCs set in each module. If using a Tech 2, use the Class 2 DTC Check feature to determine which modules have DTCs set.

Did you record any DTCs in the range of U1001-U1254 with a history status? Go to Diagnostic Trouble Code (DTC) List Go to Step 2 2

1. Turn ON the ignition, with the engine OFF.
2. Attempt to communicate with each module on the class 2 serial data circuit. If using a Tech 2, obtain this information using the class 2 Message Monitor feature.
3. Record all of the modules communicating on the class 2 serial data circuit.
4. Compare the list of modules which are communicating to the list given in Circuit Description.

Does any module on the class 2 serial data circuit not communicate? YES - Go to Step 3 NO - Go to Step 12 Test the following circuits of the module that is not communicating for an open or short to ground: ?€¢ The battery positive voltage supply circuits

?€¢ The switched battery positive supply circuits

?€¢ The battery positive voltage output circuits

?€¢ The ignition voltage input circuits

?€¢ The ignition voltage output circuits

Refer to the following: ?€¢ Control Module References in Body Control System for the applicable schematic

?€¢ Circuit Testing in Wiring Systems

?€¢ Wiring Repairs in Wiring Systems

Did you find and correct the condition? 5 Important: Inspect all connectors in the serial data communications circuit. Refer to the following: ?€¢ Data Link Connector Schematics

?€¢ Testing for Intermittent Conditions and Poor Connections in Wiring Systems

?€¢ Connector Repairs in Wiring Systems

1. Turn OFF the ignition.
2. Test the class 2 serial data circuits of the module that is not communicating for an open. Refer to the following:

?€¢ Data Link Connector Schematics

?€¢ Circuit Testing in Wiring Systems

?€¢ Wiring Repairs in Wiring Systems

Did you find and correct the condition? Go to Step 8 Go to Step 6 6 Inspect the harness connector of the module that is not communicating for poor connections and terminal tension at the following circuits: ?€¢ The battery positive voltage input circuits

?€¢ The switched battery positive voltage supply

?€¢ The battery positive voltage output circuits

?€¢ The ignition voltage input circuits

?€¢ The ignition voltage output circuits

?€¢ The ground circuits

?€¢ The class 2 serial data circuits

Refer to the following: ?€¢ Control Module References in Body Control System for the applicable schematic

?€¢ Testing for Intermittent Conditions and Poor Connections in Wiring Systems

?€¢ Connector Repairs in Wiring Systems

Did you find and correct the condition? Go to Step 8 Go to Step 7 7 Important: Perform the module programming or setup procedure if required. Replace the module that is not communicating. Refer to Control Module References in Body Control System for the appropriate Repair Instructions for the module replacement. Did you complete the replacement? Go to Step 10 -- 8

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Select the Display DTCs function for the module which was not communicating.

Does the scan tool display any DTCs which do not begin with a "U"? Go to Control Module References in Body Control System for applicable Diagnostic System Check Go to Step 9 9 Use the scan tool in order to clear the DTCs. Did you complete the action? Go to Step 10 -- 10 Select the Display DTCs function for the modules which had U1000 or U1255 set as a current DTC. Does the scan tool display DTCs which do not begin with a "U"? Go to Control Module References in Body Control System for applicable Diagnostic System Check Go to Step 11 11 Use the scan tool in order to clear the DTCs. Did you complete the action? System OK -- 12 Did you record any other DTCs for the modules which had U1000 or U1255 set as a current DTC? Go to Control Module References in Body Control System for applicable Diagnostic System Check Go to Step 13 13

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Use the scan tool in order to clear the DTCs.
4. Turn OFF the ignition for at least 5 seconds.
5. Turn ON the ignition with the engine OFF.
6. Select the Display DTCs function.

Does the scan tool display U1000 or U1255 set as a current DTC? Go to Step 14 Go to Diagnostic Aids 14 Important: Perform the module programming or setup procedure if required. Replace the module which had U1000 or U1255 set as a current DTC. Refer to Control Module References in Body Control System for the appropriate Repair Instructions for the module replacement. Did you complete the replacement? System OK

There isn't one. There is a relay. Under the hood. DRL is controlled by the BCM.

Master slender leak or intake air is low

There are probably 2 wires for illumination and dimming (grey and brown, if I recall). If either of these are shorted or connected to other wires, problems can occur. BTW, older GM's had the dome lighting tied into the brake light system; No dome light also meant no brake lights. Make sure your brake lights work!!! Check fuses for instrument lighting and brake lights as well. Make sure these wires are electrically isolated, then check/replace the fuse(s). This should take care of your problem. Good luck!!

Have the fuel system pressure checked especially after you start and stop the engine. If the system loses pressure immediately, you have a problem with loss of residual pressure caused by a check valve or equivalent.

Disconnect the battery for 5-10 min

You have know idea how the starting system works , an with the engine light on your best bet would be to have it towed to a qualified repair shop . When the ignition switch is turned to the Start position, the body control module (BCM) receives battery voltage on the ignition 1 voltage circuit, and less than 5 volts on the off/run/crank voltage circuit. The BCM supplies voltage to energize the RUN/CRANK Relay 32. The BCM sends a high speed GMLAN serial data message to the engine control module (ECM) that the key is in the start position. The ECM receives the message from the BCM, and also receives a serial data message from the transmission control module (TCM) containing the shift lever position. If the shift lever is in Park or Neutral when ignition switch is turned to Start, the ECM supplies voltage to the START Relay 31. The START relay supplies voltage to the S terminal of the starter solenoid, through the 30 A STRTR Fuse 26, in order to crank the engine.

Question edited for clarity, correct order, 'year make model'. Not sure what you mean by 'passing gear', because there isn't one! Do you mean 'kick down', which you shouldn't be using to pass, because it means that you are leaving passing too late. https://www.google.com/search?q=2007+Pontiac+G6+GT.+The+passing+gear+is+not+working Automatic gear changing is dictated by the PCM. The only way to diagnose is to get an auto electrician. A Professional Grade scan tool computer can diagnose shift solenoids by instructing them to operate and verify that they did. https://www.google.com/search?q=auto+electrician+near+me ..

Standing in front of car looking at the engine, cylinder layout is from left to right > 1--2--3--4 .... So the number one cylinder will be the one that is closest to the 'passenger' side fender. Firing order is 1 4 3 2

copy and paste https://www.repairprocedures.com/service-manual/document/2005/pontiac/montana-sv6-awd/engine/drive-belt-replacement/2829_866_18767_142376_12_1506919.html

Question edited for clarity. It is never an easy job due to lack of clearance. You need a special wrench.

How to replace the bank 1 catalytic converter on a 2008 ...

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Does it seem to only work at a certain speed? If you only have med-high it might be the resistor. If it is intermittent on all speeds it might be a bad connection

More than likely a broken wire, corroded connector or a chafed wire.

There is help in the link as well as to the Grand Am Forums. https://www.google.com/search?q=2004+pontiac+grand+am+connect+backup+camera ..

Under the drivers side of the dash against the firewall next to the steering column

ABS and Check Engine light on ??? What codes are stored ? Did you have diagnostics run, scanner hooked up to read DTC'S - diagnostic trouble codes.

The ABS light is connected to the wheel speed sensors. Make sure they are working. Clear the codes and then drive the vehicle several miles and retest the system.

# 1 is on the left or passenger side.