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P0700 Diagnostic for 2004 Chrysler PT Cruiser GT Turbo: TCM vs Solenoid Issue in Cold Weather

Model: 2004 PT Cruiser GT Turbo Fault Code: P0700 Posted: 2017-01-28 17:25

I own a 2004 Chrysler PT Cruiser GT Turbo with 144,000 miles and two previous owners. The vehicle has recently started throwing Diagnostic Trouble Code (DTC) P0700, which indicates either a faulty Transmission Control Module (TCM) or a solenoid issue in the automatic transmission. The problem is temperature-dependent: when temperatures drop below 50°F, the transmission does not engage gears until it has warmed up for nearly an hour. After that, gear engagement becomes inconsistent—sometimes working, sometimes failing. However, during warmer weather (above 50°F), the car shifts smoothly and operates normally. The transmission fluid appears clean with no burnt odor, and we have never changed the fluid or filter since purchasing the vehicle at 141,000 miles. The original owner reportedly maintained it well. The Check Engine Light (CEL) has now come on for the first time in over a year, and my OBD2 scanner confirms P0700. My son is a mechanic but lives several hours away. I'm seeking guidance to determine whether to troubleshoot the TCM or the transmission solenoid pack. Any additional insights—especially regarding fluid type, relay checks, or wiring issues—are greatly appreciated. Thanks in advance! PJ

Related fault codes

P0700

Comments (15)

Anonymous 2017-01-29 09:12

Suggestion: Get a second OBD2 scan at most auto parts stores—free and often more accurate than personal scanners. For Mopar vehicles, a stuck transmission relay can trigger P0700 as the Powertrain Control Module (PCM) may misinterpret signals. Note: GTG

Anonymous 2017-01-29 09:49

Try swapping or replacing the transmission relay (costs around $10). Clean all power distribution box (PDC) contacts with electrical contact cleaner. Ensure there’s no remote starter or ignition switch issue causing intermittent signals. The delayed gear engagement may stem from a clogged filter or using incorrect fluid. Use ATF4-specific transmission fluid—only ATF4 is compatible, not universal fluids. This fix can be done by your son while you're grilling. *PDC (Power Distribution Box) is located under the hood, typically near the relay box.

Anonymous 2017-01-29 12:34

Thanks to everyone! I’ve always used the correct fluid for topping off. There’s no remote start system. I’ll begin by changing the transmission fluid and filter as a first step—this is likely the most straightforward fix before moving on to deeper diagnostics, like TCM or solenoid issues. Even though it's mid-30s here, I'll go ahead with this plan!

Anonymous 2017-01-29 12:42

I just checked the location of the transmission relay—it’s under the hood in the fuse box. There’s a legend inside the cover that labels each component. I’ll clean the PDC contacts using proper electrical contact cleaner as recommended. Thanks again!

Anonymous 2017-01-29 13:36

TRU refers to the transmission relay? Yes—located under the hood in the fuse box. Look for a legend on the inside of the cover. The relay should click when starting. Would you like a wiring diagram to help with troubleshooting? Get a free OBD2 scan at auto parts stores (e.g., AutoZone, O'Reilly's, Advance Auto Parts)—it’s inexpensive, quick, and often more reliable than personal scanners. I strongly recommend this step.

Anonymous 2017-01-29 22:16

I have an O'Reilly's store just a few blocks from my home—I’ll go check it out today. Their scanner may provide better diagnostics than the one I currently have at home. Thanks for the tip!

Anonymous 2017-02-01 09:55

Here are the full codes pulled: P0700, P0731, P0746, P0846, P0841, PO522, P0944. Factory Chrysler code 1684. All codes except P022 relate to transmission sensor issues—many involve faulty signals from sensors. However, I drove it yesterday in 65°F weather and shifted perfectly. When temperatures drop below 45°F, gear engagement is delayed until the transmission warms up. Once engaged, shifting works fine—but this behavior is very confusing. Thanks for all the help! PJ

Anonymous 2017-02-01 12:26

Code P1684 indicates a TCM circuit issue. This DTC occurs when the Transmission Control Module (TCM) loses power (B+) or ground connection—sometimes even after removing the battery. If you recently installed a new battery, it may have triggered this code. Check whether your vehicle has been disconnected from the battery in the past. Also, verify if the transmission relay circuit is functioning properly. If the issue persists after replacing the relay, I’d recommend reviewing the wiring diagram for further analysis.

Anonymous 2017-02-01 14:13

I installed a new battery about eight months ago—no transmission issues occurred in warm weather or during that time. I’ll now check the relays and clean all module contacts as suggested. Thanks again! I’m currently recovering from hip surgery, so bending and crawling are still difficult—but I’m determined to get this resolved.

Anonymous 2017-02-01 14:57

The PDC (Power Distribution Box) is accessible under the hood—check your owner’s manual for a picture or diagram of its location.

Anonymous 2017-02-01 15:16

From my friends at OBD codes: Download this free wiring and diagnostic guide—it's large, so use a flash drive. It's safe and highly useful. Your son should be able to interpret the technical details easily. Link: http://www.mediafire.com/file/lmvdwn2nywm/01-04CPTC.pdf

Anonymous 2017-02-01 19:54

THANK YOU SO MUCH! He can read all that tech talk—LOL!

Anonymous 2017-02-01 19:55

I just spoke with my son before seeing this—he’s coming up next weekend to inspect the file. Thanks again for sharing it!

Anonymous 2017-02-02 09:50

Check PM—this is a private message.

Anonymous 2017-02-02 17:03

Got it, thanks! We have no plans to sell the vehicle—it's fully paid for. In worst-case scenario, we’ll replace the transmission. I work in the auto parts industry and can access replacement parts at cost. Appreciate all the help!