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  1. PCM melted chip - what does it control?

    TJ Tech Forum
    I decided I was going to order a new PCM based on various bits of info and ruling out certain items. Perhaps, not the best idea I ever had, I decided to open up the existing PCM to determine if I could visually identify any damage. From what I had gathered (on the interweb), many times a bad...
  2. PCM wiring to O2 sensors

    TJ Tech Forum
    Hello My Jeep has been at the local shop for months now. Brought in my 2005 Jeep Wrangler tj 4.0 se in for throttle body issue no rpm over 40 mph. Also had check engine light on O2 sensor heater failure and no voltage bank? Mechanic has given me tons of excuses like bad pcm, it was replaced but...
  3. P0153 o2 slow response. NEED HELP ASAP

    JK Tech Forum
    Last year I had thrown a code for my egr (P0403) as well as for bank 2 sensor 2 heater circuit high (P0058). I took it to my old mechanic at the time. He replaced the egr as well as the o2 sensor. He then said it was still throwing the same codes and replaced the pcm. Everything worked for about...
  4. Instrument Cluster:Temp Gauge Weirdness

    JK Tech Forum
    2007 JK with LS1 Gen3 6.0 1) Connected 2-wire Temp Sensor from 6.0 to C102 JEEP connector (Pin#18 ECT) on a "Warmed Up" 6.0 engine. 2) KeyOnEngineOff: Temp Gauge reads "MidRange" correctly in Instrument Cluster. 3) KeyOffEngineOff followed by KeyOnEngineOff: Temp Gauge reads "Cold"? 4)...
  5. Chasing an erratic idle, P0505...

    TJ Tech Forum
    Good evening WF, I wanted to throw out my situation with an idle issue and associated P0505 code (IAC valve and/or circuitry). I've been chasing this issue for 6 weeks now, largely with the help of this forum and the gurus (Jerry - :worthy:). At this point I'm near to calling the PCM...
  6. How do i know if my pcm is bad

    JK Tech Forum
    First started with my battery light went on, then a few minutes later all the control lights went on, then it did and cannot restart. Added a new Alternator, belt, and checked the battery. How do I know if its my PCM because it looks costly to take to the dealer.
  7. 2006 TJ Stalling

    TJ Tech Forum
    Hey friends, got a stumper here that several mechanics have refused to chase... Either at a stop light, starting forward on green, or for example: traveling down a highway offramp with go-ahead signal where I have to downshift and RPM drops low; the car stalls and sputters and sometimes dies...
  8. 2.4L Engine Code Jackpot?

    TJ Tech Forum
    Hey everyone, I am new to this forum, but thought I would try asking for advice. Today I went for a short drive to Walmart. Car started right up, but on the highway threw a check engine light. When I pulled into the parking lot, I viewed the codes and got the following: P2074 - vac leak...
  9. PCM/ECM Zip-Tied Connectors/Alternator Issue

    TJ Tech Forum
    I've recently been having an issue with the battery voltage on my Jeep Wrangler 2004 TJ Unlimited. The car would start with 12v visible on the dash gauge, and the "check gauges" light would come on. After replacing the alternator, testing it, testing the battery, and charging the battery back...
  10. PCM trouble

    TJ Tech Forum
    My '05 TJ drops into limp mode by locking into 2nd gear with a obd code of P0755 2-4 gear clutch solenoid circuit. Sometimes after it sits for a while, all will work fine, but after a bit, right back to limp mode. I have cleared the codes, but it re-throws the code within 10 miles, and limps...
  11. 2006 TJ 4.0L stalled and won't restart

    TJ Tech Forum
    I have a 2006 TJ 4.0L 5 speed. While driving, it quit - no sputtering, no indication of a problem, just straight quit. Upon trying to restart, it will crank readily and after a few moments of cranking, it will start to sputter like it is trying to catch, but is not getting enough fuel. The...
  12. P0031 p0037 p0051 p0057 - not pcm?

    TJ Tech Forum
    Good morning all, I've had a problem with my 2005 6 cylinder jeep tj the last several months that's making me just pull my hair out. Several months ago the check engine light came on. I bought a bluetooth OBDII adapter and Torque Pro Android app was able to read the above 4 codes - P0031 P0037...
  13. HELP!! no gauges on 98 Wrangler

    TJ Tech Forum
    I started this repair trying to make the horn work. Made it work by running two wires to Relay. Everything was working. Changed Oil, and accidentally sparked starter wire. Went to check it all out. Started up just fine, but No gauges, or mileage, but idiot lights worked.and it showed Check...
  14. 2000 TJ 4.0 Dies while driving (156000mi)

    TJ Tech Forum
    Jeep dies while driving down the road. On occasion it acts like it's not getting fuel. Most of the time its like someone turned the key off. At first I thought it was the fuel pump. It acted like every other in-tank pump that I have had go out. Fuel pump replaced with new Bosch. Ran great for 3...
  15. Where could I buy a new PCM?

    TJ Tech Forum
    My PCM is dying and I need to buy a new one for my 2005 Jeep Wrangler Sport. The only dealer where I live (I live in the Cayman Islands and no, I am not rich) wants to charge me the equivalent of US$2,926 for a new one, supplied and fitted. I have Googled and found a few places in the USA...
  16. PCM or TCM + mapping????

    TJ Tech Forum
    Hello there, blonde female here needing advice again. My 2005 Wrangler Sport has transmission issues and have avoided the authorised dealer on island (I live in Grand Cayman) as they are the biggest rip off merchants ever. Have done some diagnostics and the typical codes are flying up for...
  17. PCM or TCM + mapping????

    TJ Tech Forum
    Hello there, blonde female here needing advice again. My 2005 Wrangler Sport has transmission issues and have avoided the authorised dealer on island (I live in Grand Cayman) as they are the biggest rip off merchants ever. Have done some diagnostics and the typical codes are flying up for...
  18. 00 TJ Rough Idle Buckles >1100 RPM Odd OBD2 Readings

    TJ Tech Forum
    Need help tracking down phantom like ignition, timing and OBD-II sensor reading symptoms rendering our '00 TJ 2.5L Undriveable. Rough start, can't increase RPM's above 1100+ without initiating misfires, engine buckling/bogging down and unusual OBD-II readings. Background (sorry for all the...
  19. Jeep PCM Replacement

    TJ Tech Forum
    I got the P1604 code, I want to go get a new PCM. I have a 2005 TJ with a 4.0l 4 speed automatic. This may be a dumb question but are there any differences between a PCM for a manual transmission and an automatic transmission? I've came across some ads that were specific to the transmission and...
  20. PCM Woes

    TJ Tech Forum
    Hello everyone, New to the forum. Need some help in diagnoses. 1999 TJ 4.0 w/ auto 85,000 miles Issue started out as "Check Gauges" light with high volts showing. Tested the battery and showed 13.8 volts at mechanics engine off. Replaced battery. Did not know age of battery. Drove home and no...
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