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2005 Dodge Neon P0700 Code: Transmission Control Fault & Speedometer Failure - Diagnosis and Repair Guide

Model: 2005 Dodge Neon Fault Code: P0700 Posted: 2017-09-30 07:36

After a minor front driver's side collision, my 2005 Dodge Neon began displaying Diagnostic Trouble Code (DTC) P0700. The vehicle now shows no speedometer reading — the gauge remains completely stationary. The only nearby garage that does not specialize in transmission work performed a scan and noted: 'P0700 - Transmission Control Fault; system limited to one gear.' They advised limiting speed to 35 RPM, which is manageable given my low-mileage usage. I'm concerned about safety and long-term reliability. Is the vehicle safe to drive under these conditions? What are typical repair costs and procedures for this code? Thank you in advance for your insights! Jenny

Related fault codes

P0700

Comments (7)

Anonymous 2017-09-30 09:31

The P0700 code is a generic transmission fault indicating the vehicle has entered 'limp mode' to allow limited operation — typically only one gear. This is a safety feature designed to get you home and to a repair shop. While P0700 itself is not specific, it often precedes more detailed transmission error codes. Begin with basic checks: verify fuse #17 in the underhood fuse box (PDC) and ensure the transmission control module (TCM) relay produces an audible click when the ignition is turned on. Note: If your vehicle has a remote starter, this could interfere with system operation — check for such features. Important: You don’t necessarily need to visit a transmission specialist yet. If you have insurance coverage and it's deemed a major repair, claims may be eligible.

Anonymous 2017-09-30 10:16

Thanks for the response, Kev. I've been researching online and suspect either a faulty speed sensor or wiring/fuse issue. I noticed some forums list different P0700-related symptoms when filtering by Dodge models — could this be model-specific behavior?

Anonymous 2017-09-30 10:49

P0700 is a generic code that broadly indicates transmission system issues. In many cases, the root cause may be simple — such as no power reaching the Transmission Control Module (TCM). Check the underhood fuse box (PDC) as outlined above. Owner's manuals include wiring diagrams to assist with troubleshooting.

Anonymous 2017-09-30 10:58

Thanks again for the helpful advice!

Anonymous 2017-09-30 11:16

The underhood fuse box is a key starting point — check both the highlighted fuse and relay. These are typically the first steps in diagnosing P0700. FYI: Confirm whether your local garage used a proper diagnostic scanner to retrieve the code. A simple key-on-off cycle may not detect all faults. Many auto parts stores offer free scans with professional scanners — consider getting a second opinion if you're unsure about the first shop's diagnosis. If fuse and relay checks pass, further diagnostics using a scan tool and wiring diagrams will be necessary to identify the root cause.

Anonymous 2017-09-30 11:59

Yes, the garage used a code scanner. They are familiar with the vehicle and are the only nearby shop offering service — they generally provide reliable work. Previously, when I tried diagnosing myself by cycling the key on/off, I received a 'fuel running lean' message. This may have been unrelated to P0700. I plan to check fuse #17 soon — thank you again for your input!

Anonymous 2017-10-12 08:36

Update: I took the car in yesterday and was diagnosed with a faulty speed sensor. Thanks to your suggestions, I provided the repair shop with a checklist of potential issues. This diagnosis made sense given the symptoms — no speedometer reading and P0700 code. Appreciate the help!