Posts Tagged: P1400
P1400 Trouble Code
Diagnose and fix P1400 trouble code If you have an engine coolant heater, read this GM service bulletin first GM defines a P1400 as Cold Start Emission Reduction Control System. That may sound like Greek to you, but there’s a method to their madness. A catalytic converter must warm up sufficiently to process excess hydrocarbons. One way to do that is to increase idle speed and retard timing during a cold start. So the computer commands those parameter on cold start up and then monitors this data: Engine speed Spark … Read More
Service bulletin for P1400 or P0116 on GM
10-06-04-008B Service bulletin for P1400 or P0116 on GM GM has issued a service bulletin 10-06-04-008B to address a P1400 or P0116 on GM vehicles listed below when using an engine coolant heater. The problem occurs when outside temps are -10°F to -40°F and you’ve plugged in the engine coolant heater. The problem is caused because the catalytic converter must warm up sufficiently to process excess hydrocarbons. One way to do that is to increase idle speed and retard timing during a cold start. So the computer commands those parameter … Read More