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2006 Dodge Magnum P0700 and U0100 Codes: Diagnosis and Fix for Frequent Engine Shutdowns

Model: 2006 Dodge Magnum Fault Code: P0700 Posted: 2016-04-04 16:46

I own a 2006 Dodge Magnum with a 5.7L RT Hemi engine that is currently displaying both P0700 and U0100 diagnostic trouble codes. The vehicle shuts down approximately 10 times per day, which poses a significant safety hazard. I have already replaced the camshaft and crankshaft position sensors, purge solenoid, spark plugs, throttle control module (TCM), and powertrain control module (PCM), but the issue persists. Despite these efforts, the problem continues to occur. The P0700 code indicates that the TCM is requesting the MIL (Malfunction Indicator Lamp) to illuminate—this typically points to transmission-related issues or a communication failure between modules. The U0100 code signifies a communication error between vehicle control modules, suggesting that critical systems are not properly communicating. Given that all modifications and replacements have been performed with factory components, I am seeking advice on potential root causes. Could the issue stem from electrical faults such as power loss to the TCM or PCM? Are there known transmission sensor short circuits in this model year? Has any official TSB (Technical Service Bulletin) addressed these codes specifically for the 2006 Dodge Magnum? I am particularly interested in whether a module reflash is effective, and if there are documented fixes involving transmission sensors or wiring harnesses.

Related fault codes
P0700U0100
Comments (11)
Anonymous 2016-04-04 17:04

The vehicle appears to be stock—no aftermarket chips, programmers, remote starters, or alarms. The U0100 code indicates a communication failure between modules, while P0700 suggests the TCM is requesting the MIL on, which often points to transmission-related issues or additional trans fault codes being present.

Anonymous 2016-04-04 18:27

Yes, all modifications are stock. No aftermarket electronics, tuning devices, or performance upgrades have been installed.

Anonymous 2016-04-04 18:30

Could the TCM require a reflash? Some vehicles benefit from updated firmware in the PCM or TCM—though I’m not certain if this applies to the P0700/U0100 issue specifically.

Anonymous 2016-04-05 07:22

As a 5.7L Hemi owner, I’ve reviewed the OEM service manual supplement and suspect an electrical fault—possibly related to power supply loss in the PCM or TCM. Issues with the ignition switch, Power Distribution Center (PDC), or relays could cause intermittent shutdowns. A reflash may not resolve this; instead, a wiring inspection or sensor check is likely needed. I recommend consulting official TSBs and considering a visit to an authorized Dodge dealer for diagnostics.

Anonymous 2016-04-30 13:25

I took the vehicle to the dealership, where they replaced all eight ignition coils and claimed it was fixed. However, after calling Dodge Corporation directly to verify their work, I discovered they did not complete all the recommended repairs—this has left me with a continued safety hazard and an unresolved issue. I believe some dealerships may be overcharging or providing misleading solutions.

Anonymous 2017-09-21 01:39

I’m experiencing the same P0700 and U0100 codes. I have aftermarket stereo equipment and an alarm system. Does anyone know if these components could interfere with module communication? Any advice on how to resolve this issue?

Anonymous 2017-09-29 21:00

I’m also facing the same P0700 and U0100 issues. The car runs fine under light loads, but begins shutting down when it reaches normal operating temperature. Has anyone found a permanent fix for this problem?

Anonymous 2019-01-04 11:08

I’ve heard that in one case, a 2006 Magnum owner had the P0700 code and was told by a Dodge dealership technician that two transmission sensors were shorting out. After replacing those sensors, the issue disappeared. While I’m not certain this applies directly to U0100, it strongly suggests an electrical fault in the transmission system could be causing intermittent shutdowns and module communication failures. This may point to a grounding or wiring problem within the transmission control circuit.

Anonymous 2019-03-25 18:31

I have a 2006 Magnum SRT8 with identical symptoms. I replaced a module in the engine compartment, which resolved the issue for about two years. Now it’s back—shutting down at stops and requiring a full key-off/on cycle to restart. The 'Bolt' warning light activates each time. Codes show P0700 and P0157. While transmission performance is fine, I suspect sensor-related electrical faults. I’m leaning toward the transmission sensor theory and would appreciate any verified fixes or insights from others with similar experiences.

Anonymous 2019-03-26 08:00

Are you using a scanner capable of reading all vehicle modules and diagnostic codes? Have you confirmed there are no aftermarket modifications, such as chips, programmers, or electronic tuning devices?

Anonymous 2019-03-26 10:48

Yes, we use a portable OBD2 scanner that reads all module codes. The engine is fully factory-equipped—only an Airaid air filter has been installed.