C0700 on 2002-2006 Cadillac Escalade ESV — Transmission Control Module Communication
1 vehicles · 1 makes · $600-$3,000 repair
Most Reported On
C0700 is an OBD-II diagnostic trouble code meaning “Transmission Control Module Communication.” This chassis/network code indicates a communication problem with the Transmission Control Module (TCM) — another module on the vehicle isn't receiving the expected messages from the transmission controller over the data network (CAN bus). Modern vehicles share information between modules, and the TCM normally broadcasts data like gear position and transmission status. When those messages are missing, corrupted, or delayed, the reporting module sets this code, which can cause warning lights, limp-mode transmission behavior, or features that depend on transmission data to malfunction. The cause is usually wiring, connectors, power/ground, or a fault in the TCM or network rather than the transmission's mechanical parts. This code is most commonly reported on 2002-2006 Cadillac Escalade ESV, with repair costs ranging from $600 to $3,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C0700, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does C0700 mean?
C0700 stands for "Transmission Control Module Communication." This chassis/network code indicates a communication problem with the Transmission Control Module (TCM) — another module on the vehicle isn't receiving the expected messages from the transmission controller over the data network (CAN bus). Modern vehicles share information between modules, and the TCM normally broadcasts data like gear position and transmission status. When those messages are missing, corrupted, or delayed, the reporting module sets this code, which can cause warning lights, limp-mode transmission behavior, or features that depend on transmission data to malfunction. The cause is usually wiring, connectors, power/ground, or a fault in the TCM or network rather than the transmission's mechanical parts.
What are the most common causes of C0700?
The most common causes of C0700 are: Damaged, corroded, or loose CAN bus / data wiring, Poor power or ground supply to the TCM, Faulty connector at the TCM or in the network, Failed Transmission Control Module (TCM), Other module faulting the bus and disrupting communication, Software/calibration mismatch after a module replacement, Blown fuse feeding the TCM. The specific cause varies by vehicle.
How much does it cost to fix C0700?
Repair costs for C0700 range from $600 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by C0700?
Au7o has documented C0700 across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.