Question about 2001 Jeep Grand Cherokee

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I have the same problem what is the pcm. mine won't start. it is daining the battery.

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V10 has a new battery, won;t start below 10 degrees. Is it the starter or starter solenoid?


What make an model an year vehicle ? It could have a bad battery cable or connection . The crank relay could be bad , or the PCM on some makes !

Feb 17, 2015 | Cars & Trucks

1 Answer

2004 trailblazer problems


Check for OBD2 codes, primarily a code indicating PCM memory is corrupt. My Trailblazer at times wouldn't turn over and start. Nothing at the key. When you attempt to start the vehicle and you turn the key to the start position, the PCM sends a signal to the starter relay to start the engine. Youtube video showed a mechanic warming the PCM with a hair dryer, and it would start. Tried it on mine and it started fine. If it is the PCM, the remedy is PCM replacement. Got mine from pcmforless.com about $100.00. They had to program the new PCM with the vehicle vin number. Once installed no more problems.

Apr 04, 2014 | 2004 Chevrolet TrailBlazer

2 Answers

My 2009 Compass won't start/crank; no communication with PCM but scanner will communicate with TCM and ABS module


Double check the fuses (Inside the car and on engine bay), there is a fuse for the OBDII linkageand sometimes it works together with other systems (Power Outlets, Stereo, Switch, etc). A bad PCM would also cause that but is not very likely.

Mar 26, 2013 | 2009 Jeep Compass

1 Answer

Replaced the fuel pump on 97 dodge mini caravan now motor wont crank like the battery is dead. tried jumping it - nothing. All lights work bright! What did I do wrong?


I would check the starter for voltage first - there is a starter relay that is grounded by the PCM. If the ASD relay is faulty the pcm won't have power. You should have battery power to the starter and power on the solenoid when you turn the key to start.

Aug 31, 2012 | Cars & Trucks

2 Answers

I have a 1999 Alero 3.4 V6 the cooling fans won't run. I checked the fans they both work if I unplug the harness for the temp sensor,the relays and fuses are fine,I replaced the coolant temp sensor and...


CHECK MODE RELAY IF BOTH RELAYS GOOD YOU CAN CHECK RELAY BY REMOVING IT FROM FUSE BOX HOOK RELAY TERMINAL 85 TO BATTERY POSITIVE AND GROUND TERMINAL 86 IF CLICKS RELAY GOOD. IF RELAY GETTING POWER GOOD AND THE 30 AMP COOLING FAN FUSE OKAY.EITHER THERE IS A SHORT IN COOLING FAN WIRING OR THE PCM HAS FAILED.THE PCM HAS LOST OR COMMAND RUN CIRCUIT IN PCM SHORTED OUT DUE TO PCM FAILURE.LET DEALERSHIP OR GARAGE USE DIAGNOSTIC EQUIPMENT TO ACTIVATE THE PCM SEE IF IT HAS FAILED.DONT SPEND MONEY ON NEW PCM COULD BE SHORT IN THE WIRING CIRCUIT

Sep 06, 2011 | 1999 Oldsmobile Alero

2 Answers

My ASD fuse is making a clicking noise and vibrating. What is the function of this fuse?


ASD fuse is called an AUTOMATIC SHUT DOWN FUSE. The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

May 18, 2011 | Jeep Cherokee Cars & Trucks

2 Answers

Fault code "no bus" Vehicle


The "NO BUS" points to PCM communication failure. Disconnect the battery negative then unplug and plug back in the PCM connectors. Reconnect battery and run engine. Try pulling DTCs with a code scanner. If the PCM won't communicate, it's probably fried.

Mar 20, 2011 | Dodge Ram Pickup 2500 Cars & Trucks

1 Answer

New battery an alternator fitted yet power dains awy car wont start


Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Dec 10, 2010 | BMW 530 Cars & Trucks

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