Question about 2004 Cadillac CTS

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First codes were 201 300 301 put in reman comp. codes were202 300 302 another reman comp code is 203. are the remans bad or other problem

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You mean P0202 , an what engine does yours have ? 2.6 L ,3.3 L , 3.6 L or 5.7 L ?
DTC P0201, P0202, P0203, P0204, P0205, or P0206
The engine control module (ECM) enables the appropriate fuel injector on the intake stroke for each cylinder. Ignition voltage is supplied directly to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver. If the ECM detects an incorrect voltage for the commanded state of the driver, a fuel injector control DTC sets.
Test your fuel injector for cylinder #3 ! Do you know how to do that ?
You probably changed computers for nothing ! Check out this video on testing fuel injector circuits an checking computer driver that controls the injectors , Oh , by the way P0300 P0301 an P0302 are misfire codes , P0300 is a random misfire an the other two are for cylinders 1&2
Testing Fuel Injectors Fast PCM Driver Testing II without scan tool Did you just replace the PCM - engine computer ? Didn't test anything !

Posted on Jan 08, 2016


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#PIP3922: Repeat DTC P0606 And P1780 Setting - keywords 00 01 02 03 04 05 DTC JB L81 MAF MIL P0606 P1780 reducedpwrmde reman saturn - (Sep 26, 2006)

Subject: Repeat DTC P0606 and P1780 Setting

Models: 2000-2005 Saturn L series with L81 V6 The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
A technician may find codes P0606 and P1780 setting. They may state that they are not able to duplicate the concern. Tech may state that when the customer is driving they report a sudden loss of power, then no throttle response, and the warning indicators come on. Tech may also state that the ECM and MAF were replaced with no change.
These codes will set if the wrong MAF was installed on the vehicle previously. This being an intermittent code the MAF may work without any concerns initially. The retailer may not be aware of 2 different part number MAF's for 2000-05 L series with L81. Compounding this is the reman sticker may fall off and GM does not cross reference the Bosch part number to theirs. Any time these codes are setting have technician verify the correct MAF is installed using the reference below
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2004-05 24437651 Last 3 of Bosch # 087 (important because the reman sticker may be missing)
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a ""do-it-yourselfer"". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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