No crank no start on a GM vehicle
GM has issued a service bulletin #09-06-03-004C to address a starting condition where you encounter an intermittent no crank, no start, a no crank, no start, no click, a cranks but won’t start, or a cranks but won’t fire. The symptoms can also appear as: No Module Communication, Check engine light/service engine soon light, other warning lights, Vehicle Messages or trouble codes stored in the computer. The bulletin applies to the vehicles listed below.
GM has determined the condition may be caused by fretting corrosion in connectors to various electrical connectors. Fretting corrosion causes powdered metal wear between electrical terminals that result in no conduction. This condition may be caused by a buildup of nonconductive insulating oxidized debris known as fretting corrosion, occurring between two electrical contact surfaces of the connection or
connector. This may be caused by any of the following conditions: Vibration, Thermal cycling, Poor connection/terminal retention, Micro motion.
A connector, component or wiring harness not properly secured resulting in movement
On low current signal circuits this condition may cause high resistance, resulting in intermittent connections. On high current power circuits this condition may cause permanent increases in the resistance and may cause a device to become inoperative.
The affected vehicles are:
2005-2010 GM Passenger Cars and Trucks (including Saturn)
2005-2010 HUMMER H2, H3
2005-2009 Saab 9-7X
GM warns that the condition may be difficult to duplicate so the fix is to apply dielectric grease to all possible module connections.
The modules affected are: Blower Control Module, Body Control Module (BCM), Communication Interface Module (CIM), Cooling Fan Control Module, Electronic Brake Control Module (EBCM), Electronic Brake and Traction Control Module (EBTCM), Electronic Suspension Control (ESC) Module, Engine Control Module (ECM), Heating, Ventilation and Air Conditioning (HVAC) Control Module, Inflatable Restraint Sensing and Diagnostic Module (SDM), Any AIR BAG module, Seatbelt Lap Anchor Pretensioner, Seatbelt Retractor Pretensioner, An SIR system connection or connector condition resulting in the following DTCs being set: B0015, B0016, B0019, B0020, B0022, or B0023, Powertrain Control Module (PCM), Remote Control Door Lock Receiver (RCDLR), Transmission Control Module (TCM).
GM also warns NOT to automatically replace the control modules. If the condition is still present, disconnect and reconnect the electrical connector to the module. If the problem disappears, you’ve discovered the cause. Examine the connector to confirm
Note: Fretting corrosion looks like little dark smudges on electrical terminals and appear
where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifying glass.
Use a clean nylon brush to clean the debris from the connector. Then apply a LIGHT film of dielectric grease (part #12377900) to the terminals in the connector.
GM states that NyoGel® 760G Lubricant* is equivalent to GM #12377900, and P/N 10953529 and may be used to correct this condition.
NyoGel® 760G Lubricant from TAI Lubricants, P.O. Box 1579, Hockessin, DE 19707, 302-326-0200, 877-996-9645
©, 2015 Rick MuscoplatPosted on by Rick Muscoplat