2003 cts multiple codes
#1
2003 cts multiple codes
I have a 03 cts that will randomly start shifting hard and at times will display service idle system, reduced engine power, and has codes p2135, p0121, p0221, p2176, p1779, p1780, p1795, i have replaced the throttle body with a new oem one, and have replaced the connector at the throttle body with a new oem, i have performed a idle relearn but i am not sure if it took or not, replaced the trans computer with a used one from ebay, some things i have read show a possible ecm failure and a possible tcm failure and it is a very random problem sometimes it will be fine for a week or even a month it is just a very random issue
#2
Senior Member
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When you replaced the connector, did you solder the wires together? Have seen a lot of shops crimp the wires together. Soldering wires together is a must especially for drive by wire systems.
#3
no i did not solder them because at the local chevy dealer they told me to use the heat shrink connectors that came with the kit that had the connector and pigtails in it
#4
Senior Member
Posts like a Turbo
You really need to solder the wires instead of the crimp connectors. The drive by wire system are really finicky when it comes to changes with resistance.
#6
Senior Member
Posts like a Turbo
Ensure that the following conditions are met:
◦The vehicle speed is 0 mph.
◦The accelerator pedal angle is less than 14.9 percent.
◦The battery voltage is more than 10 volts.
◦The engine coolant temperature (ECT) is between 5–60°C (41–140°F).
◦The intake air temperature (IAT) is more than 5–60°C (41–140°F).
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF for 1 minute.
4. Turn OFF the ignition.
5. Clear DTCs as necessary.
◦The vehicle speed is 0 mph.
◦The accelerator pedal angle is less than 14.9 percent.
◦The battery voltage is more than 10 volts.
◦The engine coolant temperature (ECT) is between 5–60°C (41–140°F).
◦The intake air temperature (IAT) is more than 5–60°C (41–140°F).
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF for 1 minute.
4. Turn OFF the ignition.
5. Clear DTCs as necessary.
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vaughnsdad (12-10-2014)
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