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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
The part numbers are:
2000-03 90528435 Last 3 of Bosch # 184 (important because the reman sticker may be missing)
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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p1780 code indicates a problem in the transmission or the communication lines between the body control module and the engine control module...If the transmission had a true fault of this type in it, it would not cause the engine to shut down.
The most likely cause is that there was a glitch. Unfortunately this will be a reoccurring problem until it is fixed. If the engine check light starts to flash that means it is in limp mode and you will probably only be running about 10 miles per hour. I would say take it to Saturn dealer unfortunately they no longer exist. Best thing to do is have a transmission shop check it out. Or automotive shop sorry I don't have better news.
To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1780 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1780.
When the TCM receives a torque reduction failure message from the ECM, then DTC P1780 will set. DTC P1780 is a type C DTC.
Take your pick of which you think this code is for , this or the TSB - technical service bulletin. What need to hook up scan tool an data PID'S - Do you know what PID'S are ? sensor data read on a scan tool .
P0316 - Engine Misfire Detected on startup (first 1000 revolutions)
- Faulty Crankshaft Position (CKP) - Crankshaft Position (CKP) sensor harness is open or shorted - Crankshaft Position (CKP) sensor circuit poor electrical connection - Ignition System - Fuel Injectors - Running out of fuel - Fuel Quality - Faulty Engine Control Module (ECM)
P1780 Is the indication that the neutral safety switch has failed. It is mounted on the side of the transmission where the linkage is attached. replacement is the normal fix. This part is a bit pricey and you might get lucky looking in a salvage yard for a used one.
Saturn tail light housings are a known problem. Saturn had a service bulletin on them and would even compensate for the expense of the replacement for the 2000 model in late 2000 and 2001. The contacts are cheesey and made of plastic...get hot then warp and break. Poor design and a unreliable system. Cost on replacements is very high. You might find a useable one in a salvage yard, hard to say if it works until you install it.
P1780 is a bad neutral/park (mode) switch. This is not a common problem but I have seen them bad.The switch is located on top of the transmission where the linkage that the shift cable connects.If you ment code P1870 the let me know because this is much more common and I will go through that explanation.