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2002 PT Cruiser Engine Light On: Codes P0700 and P1864 - Transmission Stuck in First Gear

Model: 2002 PT Cruiser Fault Code: P0700 Posted: 2016-04-16 14:14

I own a 2002 PT Cruiser with over 109,000 miles (original owner), and I recently noticed my engine light came on after starting the car. I performed the 'key dance' trick and retrieved code P0700, which indicates a transmission control system malfunction. Additionally, I found code P18604 (corrected from original typo) — though this code does not typically trigger the MIL (Malfunction Indicator Lamp), it may have been set during a prior issue. While driving to an auto parts store, I noticed my transmission would not shift out of first gear. It wasn't slipping or making noise — it simply remained in first gear, behaving like a manual transmission. I checked the transmission fluid level at the store and found it was adequate. After researching the codes online, P0700 points to a failure in the transmission control system, while P1864 (corrected from original typo) may relate to an outdated or discontinued component — however, this is unlikely given that the vehicle has been maintained regularly with oil changes and a recent transmission service two years ago. I'm wondering if anyone else has experienced this issue on a 2002 PT Cruiser. If so, do you know of a reliable transmission repair shop in the Livermore, CA area? Any insights into diagnosing or fixing this would be greatly appreciated. Thanks for any help!

Related fault codes

P0700P1864

Comments (3)

Anonymous 2016-04-17 10:36

I recommend getting your vehicle scanned at a place like AutoZone or another auto parts store. The 'key dance' method won't capture all fault codes, and it's likely missing some critical transmission-related errors. The transmission is probably in 'limp mode,' which may have defaulted to staying in second or third gear — not shifting properly. A full scan will help identify the root cause. Regarding P1864: this code does not typically illuminate the MIL, so its exact timing and origin are unclear. It's best to focus on the results of a complete diagnostic scan before considering it as a primary issue. Note: Make sure your vehicle doesn't have a remote starter — if yes or no? (Please confirm).

Anonymous 2016-04-18 11:27

No remote starter. I'm heading to AutoZone right now to get a full diagnostic scan.

Anonymous 2016-04-19 17:12

Thanks, kev2. AutoZone no longer offers transmission scans — I went to Tech Transmission instead. They performed a full scan and found code P0605. They explained that the issue is not in the transmission itself but likely related to communication failure between the Powertrain Control Module (PCM) and its internal controller. The diagnostic report states that the PCM detected 8 failed serial communications within the controller — this is a known fault pattern. The component is located behind the brake master cylinder, where electrical connectors attach to the side of it. There's also a cover that appears damaged — I believe this was caused by previous shop work. I had intended to tape it securely at one point, but forgot. I’ve searched for the location of the Power Distribution Center (PDC) and PCM, but haven’t found clear diagrams or references in my manual. Any guidance on where exactly these components are located would be helpful.