I have a 95 Cadillac Deville that is giving me a code T077. I can't find any information on this code even in my alldata DIY. It is not DTC 077, because it is not giving me a Traction Control Disabled message. I was thing from other posts I have seen that it might be a pcm communication problem but not sure. Does it mean that I need a new PCM?

https://www.troublecodes.net/cadillac/deville-4-6l-deville-4-9l-eldorado-4-6l-seville-4-6l/

This will give you more information about the codes.
problems seems to be in the cruise control system.

When a malfunction such as an open fuse to a module occurs while modules are communicating, a DTC U1001-1254 Loss of 000 Communications is set current. When the modules stop communicating the current DTC U1001-1254 Loss of 000 Communications is cleared but the history DTC remains. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set. Radio quit working shows Code IRC U1000 please help

Have the codes checked ! Do you know what codes are ,What the light is for ? The light is to warn the driver that there is a problem in the ABS system . Have the codes checked before replacing parts ,the code will point you in the direction to go .This system can set numerous DTC'S
DTC C1211 DTC C1214 DTC C1217 DTC C1218 DTC C1221-C1235 DTC C1236 DTC C1237 DTC C1238 DTC C1242 or C1243 DTC C1248 DTC C1251 (w/F45) DTC C1254 DTC C1255 or C1256 DTC C1261-C1274 DTC C1276, P1644, or P1689 DTC C1277 or P1571 DTC C1278 DTC C1281, C1283, or C1286 DTC C1282 DTC C1284 or C1285 DTC C1287 or C1288 DTC C1291 or C1293 DTC C1294 DTC C1295 Maybe your best bet would be to take your vehicle to a ASE certified repair shop or the dealer

The PCM disables the compressor to prevent it from self destructing when low refrigerant is detected. You have to enter the on board diagnostics and clear the low refrigerant code to enable the compressor long enough to add refrigerant. See the DTC sticky at the top of the forum page if you need help.

If the information is helpful Then please give me some views. Thankx

Diagnostic Test Code (DTC) P1645 is described by the vehicle manufacturer as "EVAP Purge Solenoid Output Circuit".

It sounds like you have a bad idle speed actuator/motor. However, it COULD be a number of things. There should be fault codes stored in your Powertrain Control Module (PCM) if the idle speed cannot be controlled correctly.

The ONLY way to retrieve codes on your vehicle is built into the vehicle itself.

1. Turn ignition "ON."
2. Depress the "OFF" and "WARMER" buttons on the Climate Control Center (CCC) simultaneously and hold until the segment check appears on the Instrument Panel Control (IPC) .
3. After the segment check, any trouble code stored in computer memory will be displayed.

There is actually a LOT more to it than this, (like, what do you do once you have the code) but the information you need is copyrighted material and it cannot be posted here. You can get access to this and a lot more information for your vehicle by subscribing to AllData DIY for a small fee.

If you decide to do this, I can help guide you through the AllData system and show you how to
find the information you need.

What does codes 72 and 77 mean on a 95 Cadillac deville year 95

P0741 TCC System Mechanically Stuck Off (4T40, 4T45-E)

It sounds like your torque converter lock up switch is bad or the lock device inside the torque converter is damaged.

B1347 Driver Frontal Deployment Loop Stage 1 Resistance Below Threshold

This sounds like an airbag code. Possibly the sensor in the front of the car is damaged or has a wiring issue.

B1350 Engine Coolant Over-Temperature Condition

CIRCUIT DESCRIPTION
DTC B1350 is designed to disengage the A/C compressor clutch in the event that coolant temperature exceeds 126°C (258°F). The Air Conditioning Programmer (ACM) receives coolant temperature information from the PCM via class 2 serial data bus. While DTC B1350 is current the Instrument Panel Cluster (IPC) will display "ENGINE HOT - A/C COMPRESSOR OFF" on the Driver Information Center (DIC) to warn the operator. Refer to "Engine Controls" (PCM) for more information. This code will also set whenever code B1016 is set.
Read more at http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/44571-1997deville-have-acm-b1350-code-coming.html?ktrack=kcplink

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Here is the information you were looking for, please leave a positive rating if this has helped. Thanks

Specifications Firing Order Notes Firing Order